更新详情
# HBASE Changelog
## Release 2.3.1 - Unreleased (as of 2020-08-12)
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-24709](https://issues.apache.org/jira/browse/HBASE-24709) | Support MoveCostFunction use a lower multiplier in offpeak hours | Major | Balancer |
| [HBASE-24824](https://issues.apache.org/jira/browse/HBASE-24824) | Add more stats in PE for read replica | Minor | PE, read replicas |
| [HBASE-21721](https://issues.apache.org/jira/browse/HBASE-21721) | FSHLog : reduce write#syncs() times | Major | . |
| [HBASE-24823](https://issues.apache.org/jira/browse/HBASE-24823) | Port HBASE-22762 Print the delta between phases in the split/merge/compact/flush transaction journals to master branch | Minor | . |
| [HBASE-24795](https://issues.apache.org/jira/browse/HBASE-24795) | RegionMover should deal with unknown (split/merged) regions | Major | . |
| [HBASE-24821](https://issues.apache.org/jira/browse/HBASE-24821) | Simplify the logic of getRegionInfo in TestFlushFromClient to reduce redundancy code | Minor | test |
| [HBASE-24704](https://issues.apache.org/jira/browse/HBASE-24704) | Make the Table Schema easier to view even there are multiple families | Major | UI |
| [HBASE-20226](https://issues.apache.org/jira/browse/HBASE-20226) | Performance Improvement Taking Large Snapshots In Remote Filesystems | Minor | snapshots |
| [HBASE-24722](https://issues.apache.org/jira/browse/HBASE-24722) | Address hbase-shell commands with unintentional return values | Minor | shell |
| [HBASE-24669](https://issues.apache.org/jira/browse/HBASE-24669) | Logging of ppid should be consistent across all occurrences | Minor | Operability, proc-v2 |
| [HBASE-24757](https://issues.apache.org/jira/browse/HBASE-24757) | ReplicationSink should limit the batch rowcount for batch mutations based on hbase.rpc.rows.warning.threshold | Major | . |
| [HBASE-24777](https://issues.apache.org/jira/browse/HBASE-24777) | InfoServer support ipv6 host and port | Minor | UI |
| [HBASE-24758](https://issues.apache.org/jira/browse/HBASE-24758) | Avoid flooding replication source RSes logs when no sinks are available | Major | Replication |
| [HBASE-24696](https://issues.apache.org/jira/browse/HBASE-24696) | Include JVM information on Web UI under "Software Attributes" | Minor | UI |
| [HBASE-24740](https://issues.apache.org/jira/browse/HBASE-24740) | Enable journal logging for HBase snapshot operation | Minor | master |
| [HBASE-24747](https://issues.apache.org/jira/browse/HBASE-24747) | Log an ERROR if HBaseSaslRpcServer initialisation fails with an uncaught exception | Major | . |
| [HBASE-24578](https://issues.apache.org/jira/browse/HBASE-24578) | [WAL] Add a parameter to config RingBufferEventHandler's SyncFuture count | Major | wal |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-24583](https://issues.apache.org/jira/browse/HBASE-24583) | Normalizer can't actually merge empty regions when neighbor is larger than average size | Major | master, Normalizer |
| [HBASE-24844](https://issues.apache.org/jira/browse/HBASE-24844) | Exception on standalone (master) shutdown | Minor | Zookeeper |
| [HBASE-24665](https://issues.apache.org/jira/browse/HBASE-24665) | MultiWAL : Avoid rolling of ALL WALs when one of the WAL needs a roll | Major | wal |
| [HBASE-24838](https://issues.apache.org/jira/browse/HBASE-24838) | The pre commit job fails to archive surefire reports | Critical | build, scripts |
| [HBASE-23157](https://issues.apache.org/jira/browse/HBASE-23157) | WAL unflushed seqId tracking may wrong when Durability.ASYNC\_WAL is used | Major | regionserver, wal |
| [HBASE-24625](https://issues.apache.org/jira/browse/HBASE-24625) | AsyncFSWAL.getLogFileSizeIfBeingWritten does not return the expected synced file length. | Critical | Replication, wal |
| [HBASE-24788](https://issues.apache.org/jira/browse/HBASE-24788) | Fix the connection leaks on getting hbase admin from unclosed connection | Major | mapreduce |
| [HBASE-24808](https://issues.apache.org/jira/browse/HBASE-24808) | skip empty log cleaner delegate class names (WAS =\> cleaner.CleanerChore: Can NOT create CleanerDelegate= ClassNotFoundException) | Trivial | . |
| [HBASE-24767](https://issues.apache.org/jira/browse/HBASE-24767) | Change default to false for HBASE-15519 per-user metrics | Major | metrics |
| [HBASE-24713](https://issues.apache.org/jira/browse/HBASE-24713) | RS startup with FSHLog throws NPE after HBASE-21751 | Minor | wal |
| [HBASE-24794](https://issues.apache.org/jira/browse/HBASE-24794) | hbase.rowlock.wait.duration should not be \ 1 | Critical | Admin |
| [HBASE-21733](https://issues.apache.org/jira/browse/HBASE-21733) | SnapshotQuotaObserverChore should only fetch space quotas | Major | . |
| [HBASE-21699](https://issues.apache.org/jira/browse/HBASE-21699) | Create table failed when using SPLITS\_FILE =\> 'splits.txt' | Blocker | Client, shell |
| [HBASE-21535](https://issues.apache.org/jira/browse/HBASE-21535) | Zombie Master detector is not working | Critical | master |
| [HBASE-19893](https://issues.apache.org/jira/browse/HBASE-19893) | restore\_snapshot is broken in master branch when region splits | Critical | snapshots |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-24594](https://issues.apache.org/jira/browse/HBASE-24594) | testReplicationStatusSink last applied op ts comparison failure | Major | . |
| [HBASE-24493](https://issues.apache.org/jira/browse/HBASE-24493) | [flakey test] TestExportSnapshot family of tests failing due to timeout in AbstractDelegationTokenSecretManager$ExpiredTokenRemover | Major | test |
| [HBASE-24115](https://issues.apache.org/jira/browse/HBASE-24115) | Relocate test-only REST "client" from src/ to test/ and mark Private | Major | REST, security |
| [HBASE-23957](https://issues.apache.org/jira/browse/HBASE-23957) | [flakey test] client.TestMultiParallel fails to read hbase-site.xml | Minor | test |
| [HBASE-24361](https://issues.apache.org/jira/browse/HBASE-24361) | Make \`RESTApiClusterManager\` more resilient | Major | integration tests |
| [HBASE-24360](https://issues.apache.org/jira/browse/HBASE-24360) | RollingBatchRestartRsAction loses track of dead servers | Major | integration tests |
| [HBASE-24080](https://issues.apache.org/jira/browse/HBASE-24080) | [flakey test] TestRegionReplicaFailover.testSecondaryRegionKill fails. | Major | read replicas |
| [HBASE-23943](https://issues.apache.org/jira/browse/HBASE-23943) | Rubocop configuration needs updated | Minor | build |
| [HBASE-23976](https://issues.apache.org/jira/browse/HBASE-23976) | [flakey test] TestVerifyBucketCacheFile | Major | regionserver, test |
| [HBASE-24118](https://issues.apache.org/jira/browse/HBASE-24118) | [Flakey Tests] TestCloseRegionWhileRSCrash | Major | . |
| [HBASE-23956](https://issues.apache.org/jira/browse/HBASE-23956) | Use less resources running tests | Major | test |
| [HBASE-24185](https://issues.apache.org/jira/browse/HBASE-24185) | Junit tests do not behave well with System.exit or Runtime.halt or JVM exits in general. | Major | test |
| [HBASE-24183](https://issues.apache.org/jira/browse/HBASE-24183) | [flakey test] replication.TestAddToSerialReplicationPeer | Major | Client |
| [HBASE-23853](https://issues.apache.org/jira/browse/HBASE-23853) | [Flakey Test] TestBlockEvictionFromClient#testBlockRefCountAfterSplits | Major | flakies |
| [HBASE-24159](https://issues.apache.org/jira/browse/HBASE-24159) | [flakey test] regionserver.TestRegionMergeTransactionOnCluster | Major | regionserver |
| [HBASE-24161](https://issues.apache.org/jira/browse/HBASE-24161) | [flakey test] locking.TestEntityLocks.testEntityLockTimeout | Minor | Client |
| [HBASE-24114](https://issues.apache.org/jira/browse/HBASE-24114) | [Flakey Tests] TestSnapshotScannerHDFSAclController | Major | acl |
| [HBASE-24120](https://issues.apache.org/jira/browse/HBASE-24120) | Flakey Test: TestReplicationAdminWithClusters timeout | Major | Replication |
| [HBASE-24105](https://issues.apache.org/jira/browse/HBASE-24105) | [Flakey Test] regionserver.TestRegionReplicas | Major | read replicas |
| [HBASE-24107](https://issues.apache.org/jira/browse/HBASE-24107) | [Flakey Test] TestThriftServerCmdLine.testRunThriftServer NPEs if InfoServer port clash | Major | flakies |
| [HBASE-24103](https://issues.apache.org/jira/browse/HBASE-24103) | [Flakey Tests] TestSnapshotScannerHDFSAclController | Major | . |
| [HBASE-24073](https://issues.apache.org/jira/browse/HBASE-24073) | [flakey test] client.TestAsyncRegionAdminApi messed up compaction state. | Major | Compaction |
| [HBASE-24100](https://issues.apache.org/jira/browse/HBASE-24100) | [Flakey Tests] Add test to check we work properly when port clash setting up thriftserver | Major | flakies, Thrift |
| [HBASE-24075](https://issues.apache.org/jira/browse/HBASE-24075) | [Flakey Tests] teardown fails because JmxCacheBuster wants to read ClusterId from closed fs | Major | flakies |
| [HBASE-24097](https://issues.apache.org/jira/browse/HBASE-24097) | [Flakey Tests] TestSnapshotScannerHDFSAclController#testRestoreSnapshot | Major | flakies |
| [HBASE-24079](https://issues.apache.org/jira/browse/HBASE-24079) | [Flakey Tests] Misc fixes and debug; fix BindException in Thrift tests; add waits on quota table to come online; etc. | Major | flakies |
| [HBASE-22555](https://issues.apache.org/jira/browse/HBASE-22555) | Re-enable TestMasterOperationsForRegionReplicas$testIncompleteMetaTableReplicaInformation | Major | Replication, test |
| [HBASE-24047](https://issues.apache.org/jira/browse/HBASE-24047) | [Flakey Tests] Disable TestCustomSaslAuthenticationProvider#testNegativeAuthentication on branch-2.3 | Major | flakies |
| [HBASE-24034](https://issues.apache.org/jira/browse/HBASE-24034) | [Flakey Tests] A couple of fixes and cleanups | Major | flakies |
| [HBASE-24035](https://issues.apache.org/jira/browse/HBASE-24035) | [Flakey Tests] Disable TestClusterScopeQuotaThrottle#testUserNamespaceClusterScopeQuota | Major | . |
| [HBASE-23984](https://issues.apache.org/jira/browse/HBASE-23984) | [Flakey Tests] TestMasterAbortAndRSGotKilled fails in teardown | Major | . |
| [HBASE-23977](https://issues.apache.org/jira/browse/HBASE-23977) | [Flakey Tests] TestSlowLogRecorder.testOnlieSlowLogConsumption:178-\>confirmPayloadParams:97 expected:\ but was:\ | Major | test |
| [HBASE-23999](https://issues.apache.org/jira/browse/HBASE-23999) | [flakey test] TestTableOutputFormatConnectionExhaust | Major | test |
| [HBASE-23974](https://issues.apache.org/jira/browse/HBASE-23974) | [Flakey Tests] Allow that server may not yet be cleared from DeadServers in TestHBCKSCP | Major | . |
| [HBASE-23963](https://issues.apache.org/jira/browse/HBASE-23963) | Split TestFromClientSide; it takes too long to complete timing out | Major | test |
| [HBASE-23914](https://issues.apache.org/jira/browse/HBASE-23914) | TestThriftHBaseServiceHandler.testMetricsWithException failing | Major | . |
| [HBASE-23899](https://issues.apache.org/jira/browse/HBASE-23899) | [Flakey Test] Stabilizations and Debug | Major | flakies |
| [HBASE-23863](https://issues.apache.org/jira/browse/HBASE-23863) | [Flakey Test] TestReplicationEndpointWithMultipleWAL#testInterClusterReplication improvements | Major | flakies |
| [HBASE-23867](https://issues.apache.org/jira/browse/HBASE-23867) | [Flakey Test] TestStochasticLoadBalancerRegionReplicaSameHosts#testRegionReplicationOnMidClusterSameHosts | Major | . |
| [HBASE-23808](https://issues.apache.org/jira/browse/HBASE-23808) | [Flakey Test] TestMasterShutdown#testMasterShutdownBeforeStartingAnyRegionServer | Major | test |
| [HBASE-23838](https://issues.apache.org/jira/browse/HBASE-23838) | Adding debug logging to a few ExportSnapshot tests | Trivial | . |
| [HBASE-23812](https://issues.apache.org/jira/browse/HBASE-23812) | [Flakey Test] TestReplicator#testReplicatorWithErrors: AssertionError: We did not replicate enough rows expected:\ but was:\ | Major | flakies |
| [HBASE-23824](https://issues.apache.org/jira/browse/HBASE-23824) | TestSnapshotScannerHDFSAclController is flakey | Major | . |
| [HBASE-23815](https://issues.apache.org/jira/browse/HBASE-23815) | [Flakey Test] AbstractTestAsyncTableRegionReplicasRead family of tests fails with no breadcrumbs on why | Major | flakies |
| [HBASE-23814](https://issues.apache.org/jira/browse/HBASE-23814) | Add null checks and logging to misc set of tests | Trivial | . |
| [HBASE-23805](https://issues.apache.org/jira/browse/HBASE-23805) | [Flakey Test] TestRaceBetweenSCPAndDTP | Major | . |
| [HBASE-23793](https://issues.apache.org/jira/browse/HBASE-23793) | Increase maven heap allocation to 4G in Yetus personality | Major | build, test |
| [HBASE-23789](https://issues.apache.org/jira/browse/HBASE-23789) | [Flakey Tests] ERROR [Time-limited test] balancer.HeterogeneousRegionCountCostFunction(199): cannot read rules file located at ' /tmp/hbase-balancer.rules ' | Major | flakies |
| [HBASE-23792](https://issues.apache.org/jira/browse/HBASE-23792) | [Flakey Test] TestExportSnapshotNoCluster.testSnapshotWithRefsExportFileSystemState | Major | test |
| [HBASE-23783](https://issues.apache.org/jira/browse/HBASE-23783) | Address tests writing and reading SSL/Security files in a common location. | Minor | . |
| [HBASE-23786](https://issues.apache.org/jira/browse/HBASE-23786) | [Flakey Test] TestMasterNotCarryTable.testMasterMemStoreLAB | Major | flakies |
| [HBASE-23780](https://issues.apache.org/jira/browse/HBASE-23780) | Edit of test classifications | Major | test |
| [HBASE-23752](https://issues.apache.org/jira/browse/HBASE-23752) | Fix a couple more test failures from nightly run | Major | test |
| [HBASE-23764](https://issues.apache.org/jira/browse/HBASE-23764) | Flaky tests due to ZK client name resolution delays | Major | test |
| [HBASE-23770](https://issues.apache.org/jira/browse/HBASE-23770) | [Flakey Tests] TestRegionReplicasWithRestartScenarios#testWhenRestart | Major | flakies |
| [HBASE-23749](https://issues.apache.org/jira/browse/HBASE-23749) | TestHFileWriterV3 should have tests for all data block encodings | Major | . |
| [HBASE-23746](https://issues.apache.org/jira/browse/HBASE-23746) | [Flakey Tests] Caused by: org.apache.hadoop.hbase.util.CommonFSUtils$StreamLacksCapabilityException: hflush and hsync | Major | . |
| [HBASE-23731](https://issues.apache.org/jira/browse/HBASE-23731) | TestFromClientSide flakey after junit upgrade | Major | test |
| [HBASE-23735](https://issues.apache.org/jira/browse/HBASE-23735) | [Flakey Tests] TestClusterRestartFailover & TestClusterRestartFailoverSplitWithoutZk | Major | . |
| [HBASE-23729](https://issues.apache.org/jira/browse/HBASE-23729) | [Flakeys] TestRSGroupsBasics#testClearNotProcessedDeadServer fails most of the time | Major | . |
| [HBASE-23711](https://issues.apache.org/jira/browse/HBASE-23711) | Add test for MinVersions and KeepDeletedCells TTL | Minor | . |
| [HBASE-23665](https://issues.apache.org/jira/browse/HBASE-23665) | Split unit tests from TestTableName into a separate test only class | Minor | test |
| [HBASE-23569](https://issues.apache.org/jira/browse/HBASE-23569) | Validate that the log cleaner actually cleans oldWALs as expected | Major | integration tests, master, test |
| [HBASE-23555](https://issues.apache.org/jira/browse/HBASE-23555) | TestQuotaThrottle is broken | Minor | . |
| [HBASE-23552](https://issues.apache.org/jira/browse/HBASE-23552) | Format Javadocs on ITBLL | Trivial | integration tests |
| [HBASE-23259](https://issues.apache.org/jira/browse/HBASE-23259) | Ability to run mini cluster using pre-determined available random ports | Major | test |
| [HBASE-22886](https://issues.apache.org/jira/browse/HBASE-22886) | Code Coverage Improvement: Create Unit Tests for ConnectionId | Trivial | test |
| [HBASE-22766](https://issues.apache.org/jira/browse/HBASE-22766) | Code Coverage Improvement: Create Unit Tests for ResultStatsUtil | Trivial | test |
| [HBASE-22894](https://issues.apache.org/jira/browse/HBASE-22894) | Move testOpenRegionFailedMemoryLeak to dedicated class | Major | test |
| [HBASE-22725](https://issues.apache.org/jira/browse/HBASE-22725) | Remove all remaining javadoc warnings | Trivial | test |
| [HBASE-22791](https://issues.apache.org/jira/browse/HBASE-22791) | Wrong order of asserts in TestZKMulti | Trivial | Zookeeper |
| [HBASE-22615](https://issues.apache.org/jira/browse/HBASE-22615) | Make TestChoreService more robust to timing | Minor | test |
| [HBASE-22545](https://issues.apache.org/jira/browse/HBASE-22545) | TestLogLevel broken | Major | test |
| [HBASE-22548](https://issues.apache.org/jira/browse/HBASE-22548) | Split TestAdmin1 | Major | Admin, test |
| [HBASE-22524](https://issues.apache.org/jira/browse/HBASE-22524) | Refactor TestReplicationSyncUpTool | Major | test |
| [HBASE-22472](https://issues.apache.org/jira/browse/HBASE-22472) | The newly split TestReplicationStatus\* tests are flaky | Major | Replication, test |
| [HBASE-20782](https://issues.apache.org/jira/browse/HBASE-20782) | Fix duplication of TestServletFilter.access | Minor | . |
| [HBASE-22455](https://issues.apache.org/jira/browse/HBASE-22455) | Split TestReplicationStatus | Major | Replication, test |
| [HBASE-22051](https://issues.apache.org/jira/browse/HBASE-22051) | Expect values are hard-coded in the verifications of TestRSGroupsBasics | Minor | rsgroup, test |
| [HBASE-21963](https://issues.apache.org/jira/browse/HBASE-21963) | Add a script for building and verifying release candidate | Minor | community, scripts |
| [HBASE-20918](https://issues.apache.org/jira/browse/HBASE-20918) | Re-enable TestRpcHandlerException | Minor | test |
| [HBASE-21416](https://issues.apache.org/jira/browse/HBASE-21416) | Intermittent TestRegionInfoDisplay failure due to shift in relTime of RegionState#toDescriptiveString | Minor | . |
| [HBASE-21952](https://issues.apache.org/jira/browse/HBASE-21952) | Test Failure: TestClientOperationInterrupt.testInterrupt50Percent | Minor | . |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-24144](https://issues.apache.org/jira/browse/HBASE-24144) | Update docs from master | Major | documentation |
| [HBASE-22504](https://issues.apache.org/jira/browse/HBASE-22504) | Optimize the MultiByteBuff#get(ByteBuffer, offset, len) | Major | BucketCache |
| [HBASE-24630](https://issues.apache.org/jira/browse/HBASE-24630) | Purge dev javadoc from client bin tarball | Major | build |
| [HBASE-24574](https://issues.apache.org/jira/browse/HBASE-24574) | Procedure V2 - Distributed WAL Splitting =\> LOGGING | Major | wal |
| [HBASE-24577](https://issues.apache.org/jira/browse/HBASE-24577) | Doc WALSplitter classes | Trivial | wal |
| [HBASE-24505](https://issues.apache.org/jira/browse/HBASE-24505) | Reimplement Hbck.setRegionStateInMeta | Blocker | hbck2 |
| [HBASE-24309](https://issues.apache.org/jira/browse/HBASE-24309) | Avoid introducing log4j and slf4j-log4j dependencies for modules other than hbase-assembly | Major | logging, pom |
| [HBASE-24347](https://issues.apache.org/jira/browse/HBASE-24347) | Hadoop2&Hadoop3 profiles are both active when pre-commit PR builds run | Major | build |
| [HBASE-23941](https://issues.apache.org/jira/browse/HBASE-23941) | get\_slowlog\_responses filters with AND/OR operator support | Major | . |
| [HBASE-24343](https://issues.apache.org/jira/browse/HBASE-24343) | Document how to configure the http request log | Major | documentation |
| [HBASE-24405](https://issues.apache.org/jira/browse/HBASE-24405) | Document hbase:slowlog in detail | Major | . |
| [HBASE-23771](https://issues.apache.org/jira/browse/HBASE-23771) | [Flakey Tests] Test TestSplitTransactionOnCluster Again | Major | . |
| [HBASE-23938](https://issues.apache.org/jira/browse/HBASE-23938) | Replicate slow/large RPC calls to HDFS | Major | . |
| [HBASE-24333](https://issues.apache.org/jira/browse/HBASE-24333) | Backport HBASE-24304 "Separate a hbase-asyncfs module" to branch-2.x | Major | build, pom |
| [HBASE-24354](https://issues.apache.org/jira/browse/HBASE-24354) | Make it so can make an hbase1 schema and hbase2 schema equate | Major | . |
| [HBASE-24331](https://issues.apache.org/jira/browse/HBASE-24331) | [Flakey Test] TestJMXListener rmi port clash | Major | flakies, test |
| [HBASE-24310](https://issues.apache.org/jira/browse/HBASE-24310) | Use Slf4jRequestLog for hbase-http | Major | logging |
| [HBASE-24265](https://issues.apache.org/jira/browse/HBASE-24265) | Remove hedged rpc call support, implement the logic in MaterRegistry directly | Major | IPC/RPC |
| [HBASE-24303](https://issues.apache.org/jira/browse/HBASE-24303) | Undo core of parent TestSecureRESTServer change; use fix over in HBASE-24280 instead | Major | . |
| [HBASE-24143](https://issues.apache.org/jira/browse/HBASE-24143) | [JDK11] Switch default garbage collector from CMS | Major | scripts |
| [HBASE-24218](https://issues.apache.org/jira/browse/HBASE-24218) | Add hadoop 3.2.x in hadoop check | Major | scripts |
| [HBASE-23829](https://issues.apache.org/jira/browse/HBASE-23829) | Get \`-PrunSmallTests\` passing on JDK11 | Major | test |
| [HBASE-24175](https://issues.apache.org/jira/browse/HBASE-24175) | [Flakey Tests] TestSecureExportSnapshot FileNotFoundException | Major | flakies |
| [HBASE-23697](https://issues.apache.org/jira/browse/HBASE-23697) | Document new RegionProcedureStore operation and migration | Major | documentation |
| [HBASE-24134](https://issues.apache.org/jira/browse/HBASE-24134) | Down forked JVM heap size from 2800m to 2200m for jdk8 and jdk11 | Major | . |
| [HBASE-24126](https://issues.apache.org/jira/browse/HBASE-24126) | Up the container nproc uplimit from 10000 to 12500 | Major | build |
| [HBASE-24150](https://issues.apache.org/jira/browse/HBASE-24150) | Allow module tests run in parallel | Major | build |
| [HBASE-24113](https://issues.apache.org/jira/browse/HBASE-24113) | Upgrade the maven we use from 3.5.4 to 3.6.3 in nightlies | Major | build |
| [HBASE-24109](https://issues.apache.org/jira/browse/HBASE-24109) | Change fork count from 0.5C to 0.25C | Major | . |
| [HBASE-24071](https://issues.apache.org/jira/browse/HBASE-24071) | [JDK11] Remove \`unit\` filter from nightly and precommit jobs | Major | build, test |
| [HBASE-23937](https://issues.apache.org/jira/browse/HBASE-23937) | Retrieve online large RPC logs | Major | . |
| [HBASE-22022](https://issues.apache.org/jira/browse/HBASE-22022) | nightly fails rat check down in the dev-support/hbase\_nightly\_source-artifact.sh check | Major | . |
| [HBASE-23992](https://issues.apache.org/jira/browse/HBASE-23992) | Fix TestAdminShell and TestQuotasShell mistakenly broken by parent commit | Trivial | test |
| [HBASE-24052](https://issues.apache.org/jira/browse/HBASE-24052) | Add debug+fix to TestMasterShutdown | Trivial | . |
| [HBASE-24007](https://issues.apache.org/jira/browse/HBASE-24007) | Get \`-PrunLargeTests\` passing on JDK11 | Major | test |
| [HBASE-24050](https://issues.apache.org/jira/browse/HBASE-24050) | Deprecated PBType on all 2.x branches | Major | Protobufs |
| [HBASE-24045](https://issues.apache.org/jira/browse/HBASE-24045) | Support setting \`-Dhadoop.profile\` in adhoc\_run\_tests.sh | Minor | tooling |
| [HBASE-24037](https://issues.apache.org/jira/browse/HBASE-24037) | Add ut for root dir and wal root dir are different | Major | . |
| [HBASE-23936](https://issues.apache.org/jira/browse/HBASE-23936) | Thrift support for get and clear slow\_log APIs | Major | . |
| [HBASE-24033](https://issues.apache.org/jira/browse/HBASE-24033) | Add ut for loading the corrupt recovered hfiles | Major | . |
| [HBASE-24009](https://issues.apache.org/jira/browse/HBASE-24009) | Backport the personality changes in HBASE-23989 to all active branches | Major | build |
| [HBASE-23993](https://issues.apache.org/jira/browse/HBASE-23993) | Use loopback for zk standalone server in minizkcluster | Major | Zookeeper |
| [HBASE-23891](https://issues.apache.org/jira/browse/HBASE-23891) | Add an option to Actions to filter out meta RS | Minor | integration tests |
| [HBASE-23991](https://issues.apache.org/jira/browse/HBASE-23991) | [Flakey Tests] Disable TestSecureExport.testVisibilityLabels | Major | flakies |
| [HBASE-23979](https://issues.apache.org/jira/browse/HBASE-23979) | Disable TestSlowLogRecorder until parent addressed | Major | test |
| [HBASE-23851](https://issues.apache.org/jira/browse/HBASE-23851) | Log networks and bind addresses when multicast publisher/listener enabled | Trivial | . |
| [HBASE-23946](https://issues.apache.org/jira/browse/HBASE-23946) | [JDK11] Yetus should vote -0 for known JDK11 issues | Minor | build |
| [HBASE-23739](https://issues.apache.org/jira/browse/HBASE-23739) | BoundedRecoveredHFilesOutputSink should read the table descriptor directly | Major | . |
| [HBASE-23912](https://issues.apache.org/jira/browse/HBASE-23912) | Resolve the TODO of FSTableDescriptor's construct method | Major | . |
| [HBASE-23788](https://issues.apache.org/jira/browse/HBASE-23788) | ROW\_INDEX\_V1 encoder should consider the secondary index size with the encoded data size tracking | Major | . |
| [HBASE-23876](https://issues.apache.org/jira/browse/HBASE-23876) | Add JDK11 compilation and unit test support to nightly job | Major | build |
| [HBASE-23767](https://issues.apache.org/jira/browse/HBASE-23767) | Add JDK11 compilation and unit test support to Github precommit | Major | build |
| [HBASE-23926](https://issues.apache.org/jira/browse/HBASE-23926) | [Flakey Tests] Down the flakies re-run ferocity; it makes for too many fails. | Major | flakies |
| [HBASE-23740](https://issues.apache.org/jira/browse/HBASE-23740) | Invalid StoreFile WARN log message printed for recovered.hfiles directory | Minor | MTTR |
| [HBASE-23755](https://issues.apache.org/jira/browse/HBASE-23755) | [OpenTracing] Declare HTrace is unusable in the user doc | Major | . |
| [HBASE-23877](https://issues.apache.org/jira/browse/HBASE-23877) | [Flakey Test] TestStochasticLoadBalancerRegionReplicaHighReplication "Two or more region replicas are hosted on the same host after balance" | Major | . |
| [HBASE-23331](https://issues.apache.org/jira/browse/HBASE-23331) | Document HBASE-18095 | Major | documentation |
| [HBASE-23304](https://issues.apache.org/jira/browse/HBASE-23304) | Implement RPCs needed for master based registry | Major | master |
| [HBASE-23816](https://issues.apache.org/jira/browse/HBASE-23816) | [Flakey Test] TestExportSnapshotNoCluster.testSnapshotV2WithRefsExportFileSystemState(TestExportSnapshotNoCluster.java:91) Wrong FS! | Major | . |
| [HBASE-23350](https://issues.apache.org/jira/browse/HBASE-23350) | Make compaction files cacheonWrite configurable based on threshold | Major | Compaction |
| [HBASE-23705](https://issues.apache.org/jira/browse/HBASE-23705) | Add CellComparator to HFileContext | Major | io |
| [HBASE-23753](https://issues.apache.org/jira/browse/HBASE-23753) | Update of errorprone generated failures | Major | . |
| [HBASE-23647](https://issues.apache.org/jira/browse/HBASE-23647) | Make MasterRegistry the default registry impl | Major | Client |
| [HBASE-23707](https://issues.apache.org/jira/browse/HBASE-23707) | Add IntelliJ check style plugin configuration | Minor | build |
| [HBASE-23330](https://issues.apache.org/jira/browse/HBASE-23330) | Expose cluster ID for clients using it for delegation token based auth | Major | Client, master |
| [HBASE-23728](https://issues.apache.org/jira/browse/HBASE-23728) | Include HBASE-21018 in 2.2 & 2.3 | Major | . |
| [HBASE-23727](https://issues.apache.org/jira/browse/HBASE-23727) | Port HBASE-20981 in 2.2 & 2.3 | Major | . |
| [HBASE-23726](https://issues.apache.org/jira/browse/HBASE-23726) | Forward-port HBASE-21345 to branch-2.2, 2.3 & master as well. | Major | . |
| [HBASE-23722](https://issues.apache.org/jira/browse/HBASE-23722) | TestCustomSaslAuthenticationProvider failing in nightlies | Major | . |
| [HBASE-23680](https://issues.apache.org/jira/browse/HBASE-23680) | RegionProcedureStore missing cleaning of hfile archive | Major | proc-v2, RegionProcedureStore |
| [HBASE-18326](https://issues.apache.org/jira/browse/HBASE-18326) | Fix and reenable TestMasterProcedureWalLease | Blocker | test |
| [HBASE-23305](https://issues.apache.org/jira/browse/HBASE-23305) | Master based registry implementation | Major | master |
| [HBASE-23681](https://issues.apache.org/jira/browse/HBASE-23681) | Add UT for procedure store region flusher | Major | proc-v2, RegionProcedureStore |
| [HBASE-23588](https://issues.apache.org/jira/browse/HBASE-23588) | Cache index blocks and bloom blocks on write if CacheCompactedBlocksOnWrite is enabled | Major | . |
| [HBASE-23320](https://issues.apache.org/jira/browse/HBASE-23320) | Upgrade surefire plugin to 3.0.0-M4 | Major | dependencies, test |
| [HBASE-20461](https://issues.apache.org/jira/browse/HBASE-20461) | Implement fsync for AsyncFSWAL | Major | wal |
| [HBASE-23085](https://issues.apache.org/jira/browse/HBASE-23085) | Network and Data related Actions | Minor | integration tests |
| [HBASE-23281](https://issues.apache.org/jira/browse/HBASE-23281) | Track meta region changes on masters | Major | master |
| [HBASE-23307](https://issues.apache.org/jira/browse/HBASE-23307) | Add running of ReplicationBarrierCleaner to hbck2 fixMeta invocation | Major | hbck2 |
| [HBASE-23322](https://issues.apache.org/jira/browse/HBASE-23322) | [hbck2] Simplification on HBCKSCP scheduling | Minor | hbck2 |
| [HBASE-23275](https://issues.apache.org/jira/browse/HBASE-23275) | Track active master server name in ActiveMasterManager | Major | master |
| [HBASE-23257](https://issues.apache.org/jira/browse/HBASE-23257) | Track ClusterID in stand by masters | Major | master |
| [HBASE-22480](https://issues.apache.org/jira/browse/HBASE-22480) | Get block from BlockCache once and return this block to BlockCache twice make ref count error. | Major | . |
| [HBASE-23136](https://issues.apache.org/jira/browse/HBASE-23136) | PartionedMobFileCompactor bulkloaded files shouldn't get replicated (addressing buklload replication related issue raised in HBASE-22380) | Critical | . |
| [HBASE-15519](https://issues.apache.org/jira/browse/HBASE-15519) | Add per-user metrics | Major | metrics |
| [HBASE-22460](https://issues.apache.org/jira/browse/HBASE-22460) | Reopen a region if store reader references may have leaked | Minor | . |
| [HBASE-23163](https://issues.apache.org/jira/browse/HBASE-23163) | Refactor HStore.getStorefilesSize related methods | Major | regionserver |
| [HBASE-22982](https://issues.apache.org/jira/browse/HBASE-22982) | Send SIGSTOP to hang or SIGCONT to resume rs and add graceful rolling restart | Minor | integration tests |
| [HBASE-22927](https://issues.apache.org/jira/browse/HBASE-22927) | Upgrade mockito version for Java 11 compatibility | Major | . |
| [HBASE-22796](https://issues.apache.org/jira/browse/HBASE-22796) | [HBCK2] Add fix of overlaps to fixMeta hbck Service | Major | . |
| [HBASE-22993](https://issues.apache.org/jira/browse/HBASE-22993) | HBCK report UI showed -1 if hbck chore not running | Minor | . |
| [HBASE-23014](https://issues.apache.org/jira/browse/HBASE-23014) | Should not show split parent regions in hbck report UI | Major | . |
| [HBASE-22859](https://issues.apache.org/jira/browse/HBASE-22859) | [HBCK2] Fix the orphan regions on filesystem | Major | documentation, hbck2 |
| [HBASE-22878](https://issues.apache.org/jira/browse/HBASE-22878) | Show table throttle quotas in table jsp | Major | . |
| [HBASE-22946](https://issues.apache.org/jira/browse/HBASE-22946) | Fix TableNotFound when grant/revoke if AccessController is not loaded | Major | . |
| [HBASE-22945](https://issues.apache.org/jira/browse/HBASE-22945) | Show quota infos in master UI | Major | master, UI |
| [HBASE-22858](https://issues.apache.org/jira/browse/HBASE-22858) | Add HBCK Report to master's header.jsp | Minor | master |
| [HBASE-22891](https://issues.apache.org/jira/browse/HBASE-22891) | Use HBaseQA in HBase-PreCommit-GitHub-PR job | Major | build, scripts |
| [HBASE-22842](https://issues.apache.org/jira/browse/HBASE-22842) | Tmp directory should not be deleted when master restart used for user scan snapshot feature | Major | . |
| [HBASE-22771](https://issues.apache.org/jira/browse/HBASE-22771) | [HBCK2] fixMeta method and server-side support | Major | hbck2 |
| [HBASE-22845](https://issues.apache.org/jira/browse/HBASE-22845) | Revert MetaTableAccessor#makePutFromTableState access to public | Blocker | . |
| [HBASE-22777](https://issues.apache.org/jira/browse/HBASE-22777) | Add a multi-region merge (for fixing overlaps, etc.) | Major | hbck2, proc-v2 |
| [HBASE-22803](https://issues.apache.org/jira/browse/HBASE-22803) | Modify config value range to enable turning off of the hbck chore | Major | . |
| [HBASE-22824](https://issues.apache.org/jira/browse/HBASE-22824) | Show filesystem path for the orphans regions on filesystem | Major | . |
| [HBASE-22808](https://issues.apache.org/jira/browse/HBASE-22808) | HBCK Report showed the offline regions which belong to disabled table | Major | . |
| [HBASE-22776](https://issues.apache.org/jira/browse/HBASE-22776) | Rename config names in user scan snapshot feature | Major | . |
| [HBASE-22807](https://issues.apache.org/jira/browse/HBASE-22807) | HBCK Report showed wrong orphans regions on FileSystem | Major | . |
| [HBASE-22737](https://issues.apache.org/jira/browse/HBASE-22737) | Add a new admin method and shell cmd to trigger the hbck chore to run | Major | . |
| [HBASE-22741](https://issues.apache.org/jira/browse/HBASE-22741) | Show catalogjanitor consistency complaints in new 'HBCK Report' page | Major | hbck2, UI |
| [HBASE-22723](https://issues.apache.org/jira/browse/HBASE-22723) | Have CatalogJanitor report holes and overlaps; i.e. problems it sees when doing its regular scan of hbase:meta | Major | . |
| [HBASE-22580](https://issues.apache.org/jira/browse/HBASE-22580) | Add a table attribute to make user scan snapshot feature configurable for table | Major | . |
| [HBASE-22709](https://issues.apache.org/jira/browse/HBASE-22709) | Add a chore thread in master to do hbck checking and display results in 'HBCK Report' page | Major | . |
| [HBASE-22742](https://issues.apache.org/jira/browse/HBASE-22742) | [HBCK2] Add more log for hbck operations at master side | Minor | . |
| [HBASE-22578](https://issues.apache.org/jira/browse/HBASE-22578) | HFileCleaner should not delete empty ns/table directories used for user san snapshot feature | Major | . |
| [HBASE-22527](https://issues.apache.org/jira/browse/HBASE-22527) | [hbck2] Add a master web ui to show the problematic regions | Major | hbase-operator-tools, hbck2 |
| [HBASE-22719](https://issues.apache.org/jira/browse/HBASE-22719) | Add debug support for github PR pre commit job | Major | build |
| [HBASE-22663](https://issues.apache.org/jira/browse/HBASE-22663) | The HeapAllocationRatio in WebUI is not accurate because all of the heap allocation will happen in another separated allocator named HEAP | Major | . |
| [HBASE-22673](https://issues.apache.org/jira/browse/HBASE-22673) | Avoid to expose protobuf stuff in Hbck interface | Major | hbck2 |
| [HBASE-7191](https://issues.apache.org/jira/browse/HBASE-7191) | HBCK - Add offline create/fix hbase.version and hbase.id | Major | hbck |
| [HBASE-22621](https://issues.apache.org/jira/browse/HBASE-22621) | Backport offheap block reading (HBASE-21879) to branch-2 | Major | Offheaping |
| [HBASE-20060](https://issues.apache.org/jira/browse/HBASE-20060) | Add details of off heap memstore into book. | Critical | documentation |
| [HBASE-21995](https://issues.apache.org/jira/browse/HBASE-21995) | Add a coprocessor to set HDFS ACL for hbase granted user | Major | Coprocessors, security |
| [HBASE-22547](https://issues.apache.org/jira/browse/HBASE-22547) | Align the config keys and add document for offheap read in HBase Book. | Major | . |
| [HBASE-21284](https://issues.apache.org/jira/browse/HBASE-21284) | Forward port HBASE-21000 to branch-2 | Major | . |
| [HBASE-22600](https://issues.apache.org/jira/browse/HBASE-22600) | Document that LoadIncrementalHFiles will be removed in 3.0.0 | Major | . |
| [HBASE-22588](https://issues.apache.org/jira/browse/HBASE-22588) | Upgrade jaxws-ri dependency to 2.3.2 | Major | dependencies, java |
| [HBASE-22585](https://issues.apache.org/jira/browse/HBASE-22585) | Ensure javax.annotation doesn't get include in shaded artifacts when built with Java 11 | Major | build, java |
| [HBASE-22598](https://issues.apache.org/jira/browse/HBASE-22598) | Deprecated the hbase.ipc.server.reservoir.initial.buffer.size & hbase.ipc.server.reservoir.initial.max for HBase2.x compatibility | Major | . |
| [HBASE-22264](https://issues.apache.org/jira/browse/HBASE-22264) | Separate out jars related to JDK 11 into a folder in /lib | Minor | java |
| [HBASE-22531](https://issues.apache.org/jira/browse/HBASE-22531) | The HFileReaderImpl#shouldUseHeap return the incorrect true when disabled BlockCache | Major | . |
| [HBASE-22458](https://issues.apache.org/jira/browse/HBASE-22458) | TestClassFinder fails when run on JDK11 | Minor | java, test |
| [HBASE-22491](https://issues.apache.org/jira/browse/HBASE-22491) | Separate the heap HFileBlock and offheap HFileBlock because the heap block won't need refCnt and save into prevBlocks list before shipping | Major | . |
| [HBASE-22569](https://issues.apache.org/jira/browse/HBASE-22569) | Should treat null consistency as Consistency.STRONG in ConnectionUtils.timelineConsistentRead | Major | . |
| [HBASE-22357](https://issues.apache.org/jira/browse/HBASE-22357) | Fix remaining Checkstyle issues in hbase-replication | Trivial | Replication |
| [HBASE-22554](https://issues.apache.org/jira/browse/HBASE-22554) | Upgrade to surefire 2.22.2 | Major | test |
| [HBASE-22534](https://issues.apache.org/jira/browse/HBASE-22534) | TestCellUtil fails when run on JDK11 | Minor | java, test |
| [HBASE-22536](https://issues.apache.org/jira/browse/HBASE-22536) | TestForeignExceptionSerialization fails when run on JDK11 | Minor | java |
| [HBASE-22535](https://issues.apache.org/jira/browse/HBASE-22535) | TestShellRSGroups fails when run on JDK11 | Minor | java, shell |
| [HBASE-22500](https://issues.apache.org/jira/browse/HBASE-22500) | Modify pom and jenkins jobs for hadoop versions | Blocker | build, hadoop2, hadoop3 |
| [HBASE-22483](https://issues.apache.org/jira/browse/HBASE-22483) | It's better to use 65KB as the default buffer size in ByteBuffAllocator | Major | BucketCache |
| [HBASE-22463](https://issues.apache.org/jira/browse/HBASE-22463) | Some paths in HFileScannerImpl did not consider block#release which will exhaust the ByteBuffAllocator | Major | . |
| [HBASE-22316](https://issues.apache.org/jira/browse/HBASE-22316) | Record the stack trace for current thread in FutureUtils.get | Major | asyncclient, Client |
| [HBASE-22422](https://issues.apache.org/jira/browse/HBASE-22422) | Retain an ByteBuff with refCnt=0 when getBlock from LRUCache | Major | BlockCache |
| [HBASE-22326](https://issues.apache.org/jira/browse/HBASE-22326) | Fix Checkstyle errors in hbase-examples | Minor | . |
| [HBASE-22327](https://issues.apache.org/jira/browse/HBASE-22327) | Fix remaining Checkstyle issues in hbase-hadoop-compat | Trivial | . |
| [HBASE-22478](https://issues.apache.org/jira/browse/HBASE-22478) | Add jackson dependency for hbase-http module | Major | build, dependencies |
| [HBASE-22445](https://issues.apache.org/jira/browse/HBASE-22445) | Add file info when throw exceptions in HFileReaderImpl | Major | . |
| [HBASE-22447](https://issues.apache.org/jira/browse/HBASE-22447) | Check refCount before free block in BucketCache | Major | BucketCache |
| [HBASE-22435](https://issues.apache.org/jira/browse/HBASE-22435) | Add a UT to address the HFileBlock#heapSize() in TestHeapSize | Major | . |
| [HBASE-22412](https://issues.apache.org/jira/browse/HBASE-22412) | Improve the metrics in ByteBuffAllocator | Major | . |
| [HBASE-22400](https://issues.apache.org/jira/browse/HBASE-22400) | Remove the adapter code in async fs implementation for hadoop-2.7.x | Major | wal |
| [HBASE-22430](https://issues.apache.org/jira/browse/HBASE-22430) | hbase-vote should tee build and test output to console | Trivial | . |
| [HBASE-22429](https://issues.apache.org/jira/browse/HBASE-22429) | hbase-vote download step requires URL to end with '/' | Trivial | . |
| [HBASE-22399](https://issues.apache.org/jira/browse/HBASE-22399) | Change default hadoop-two.version to 2.8.x and remove the 2.7.x hadoop checks | Major | build, hadoop2 |
| [HBASE-22405](https://issues.apache.org/jira/browse/HBASE-22405) | Update Ref Guide for EOL of Hadoop 2.7 | Major | community, documentation |
| [HBASE-22090](https://issues.apache.org/jira/browse/HBASE-22090) | The HFileBlock#CacheableDeserializer should pass ByteBuffAllocator to the newly created HFileBlock | Major | . |
| [HBASE-21921](https://issues.apache.org/jira/browse/HBASE-21921) | Notify users if the ByteBufAllocator is always allocating ByteBuffers from heap which means the increacing GC pressure | Minor | . |
| [HBASE-22345](https://issues.apache.org/jira/browse/HBASE-22345) | REST Server must have specific version of javax.annotations available at runtime | Major | REST |
| [HBASE-22325](https://issues.apache.org/jira/browse/HBASE-22325) | AsyncRpcRetryingCaller will not schedule retry if we hit a NotServingRegionException but there is no TableName provided | Major | asyncclient, Client |
| [HBASE-22322](https://issues.apache.org/jira/browse/HBASE-22322) | Use special pause for CallQueueTooBigException | Major | asyncclient, Client |
| [HBASE-22317](https://issues.apache.org/jira/browse/HBASE-22317) | Support reading from meta replicas | Major | asyncclient, read replicas |
| [HBASE-22122](https://issues.apache.org/jira/browse/HBASE-22122) | Change to release mob hfile's block after rpc server shipped response to client | Major | . |
| [HBASE-22218](https://issues.apache.org/jira/browse/HBASE-22218) | Shell throws "Unsupported Java version" when tried with Java 11 (run-time) | Major | . |
| [HBASE-21937](https://issues.apache.org/jira/browse/HBASE-21937) | Make the Compression#decompress can accept ByteBuff as input | Major | . |
| [HBASE-22211](https://issues.apache.org/jira/browse/HBASE-22211) | Remove the returnBlock method because we can just call HFileBlock#release directly | Major | . |
| [HBASE-19222](https://issues.apache.org/jira/browse/HBASE-19222) | update jruby to 9.1.17.0 | Major | shell |
| [HBASE-21957](https://issues.apache.org/jira/browse/HBASE-21957) | Unify refCount of BucketEntry and refCount of hbase.nio.ByteBuff into one | Major | . |
| [HBASE-22208](https://issues.apache.org/jira/browse/HBASE-22208) | Create access checker and expose it in RS | Major | . |
| [HBASE-22261](https://issues.apache.org/jira/browse/HBASE-22261) | Make use of ClusterStatusListener for async client | Major | asyncclient |
| [HBASE-22267](https://issues.apache.org/jira/browse/HBASE-22267) | Implement client push back for async client | Major | asyncclient |
| [HBASE-19763](https://issues.apache.org/jira/browse/HBASE-19763) | Fix Checkstyle errors in hbase-procedure | Minor | . |
| [HBASE-22244](https://issues.apache.org/jira/browse/HBASE-22244) | Make use of MetricsConnection in async client | Major | asyncclient, metrics |
| [HBASE-22249](https://issues.apache.org/jira/browse/HBASE-22249) | Rest Server throws NoClassDefFoundError with Java 11 (run-time) | Major | . |
| [HBASE-22159](https://issues.apache.org/jira/browse/HBASE-22159) | ByteBufferIOEngine should support write off-heap ByteBuff to the bufferArray | Major | . |
| [HBASE-22084](https://issues.apache.org/jira/browse/HBASE-22084) | Rename AccessControlLists to PermissionStorage | Major | . |
| [HBASE-22196](https://issues.apache.org/jira/browse/HBASE-22196) | Split TestRestartCluster | Major | test |
| [HBASE-21965](https://issues.apache.org/jira/browse/HBASE-21965) | Fix failed split and merge transactions that have failed to roll back | Major | hbck2 |
| [HBASE-22117](https://issues.apache.org/jira/browse/HBASE-22117) | Move hasPermission/checkPermissions from region server to master | Major | . |
| [HBASE-22153](https://issues.apache.org/jira/browse/HBASE-22153) | Fix the flaky TestRestartCluster | Major | test |
| [HBASE-22127](https://issues.apache.org/jira/browse/HBASE-22127) | Ensure that the block cached in the LRUBlockCache offheap is allocated from heap | Major | . |
| [HBASE-22152](https://issues.apache.org/jira/browse/HBASE-22152) | Create a jenkins file for yetus to processing GitHub PR | Major | build |
| [HBASE-22158](https://issues.apache.org/jira/browse/HBASE-22158) | RawAsyncHBaseAdmin.getTableSplits should filter out none default replicas | Major | Admin |
| [HBASE-22157](https://issues.apache.org/jira/browse/HBASE-22157) | Include the cause when constructing RestoreSnapshotException in restoreSnapshot | Major | Admin |
| [HBASE-22141](https://issues.apache.org/jira/browse/HBASE-22141) | Fix TestAsyncDecommissionAdminApi | Major | test |
| [HBASE-22005](https://issues.apache.org/jira/browse/HBASE-22005) | Use ByteBuff's refcnt to track the life cycle of data block | Major | . |
| [HBASE-22135](https://issues.apache.org/jira/browse/HBASE-22135) | AsyncAdmin will not refresh master address | Major | Admin, asyncclient, Client |
| [HBASE-22101](https://issues.apache.org/jira/browse/HBASE-22101) | AsyncAdmin.isTableAvailable should not throw TableNotFoundException | Major | Admin, asyncclient, Client |
| [HBASE-22094](https://issues.apache.org/jira/browse/HBASE-22094) | Throw TableNotFoundException if table not exists in AsyncAdmin.compact | Major | Admin |
| [HBASE-21911](https://issues.apache.org/jira/browse/HBASE-21911) | Move getUserPermissions from regionserver to master | Major | . |
| [HBASE-22015](https://issues.apache.org/jira/browse/HBASE-22015) | UserPermission should be annotated as InterfaceAudience.Public | Blocker | . |
| [HBASE-22040](https://issues.apache.org/jira/browse/HBASE-22040) | Add mergeRegionsAsync with a List of region names method in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22039](https://issues.apache.org/jira/browse/HBASE-22039) | Should add the synchronous parameter for the XXXSwitch method in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22025](https://issues.apache.org/jira/browse/HBASE-22025) | RAT check fails in nightlies; fails on (old) test data files. | Major | . |
| [HBASE-21977](https://issues.apache.org/jira/browse/HBASE-21977) | Skip replay WAL and update seqid when open regions restored from snapshot | Major | Region Assignment, snapshots |
| [HBASE-22016](https://issues.apache.org/jira/browse/HBASE-22016) | Rewrite the block reading methods by using hbase.nio.ByteBuff | Major | . |
| [HBASE-22000](https://issues.apache.org/jira/browse/HBASE-22000) | Deprecated isTableAvailable with splitKeys | Major | asyncclient, Client |
| [HBASE-21917](https://issues.apache.org/jira/browse/HBASE-21917) | Make the HFileBlock#validateChecksum can accept ByteBuff as an input. | Major | . |
| [HBASE-21949](https://issues.apache.org/jira/browse/HBASE-21949) | Fix flaky test TestHBaseTestingUtility.testMiniZooKeeperWithMultipleClientPorts | Major | . |
| [HBASE-15728](https://issues.apache.org/jira/browse/HBASE-15728) | Add remaining per-table region / store / flush / compaction related metrics | Major | metrics |
| [HBASE-21934](https://issues.apache.org/jira/browse/HBASE-21934) | RemoteProcedureDispatcher should track the ongoing dispatched calls | Blocker | proc-v2 |
| [HBASE-21978](https://issues.apache.org/jira/browse/HBASE-21978) | Should close AsyncRegistry if we fail to get cluster id when creating AsyncConnection | Major | asyncclient, Client |
| [HBASE-21974](https://issues.apache.org/jira/browse/HBASE-21974) | Change Admin#grant/revoke parameter from UserPermission to user and Permission | Major | . |
| [HBASE-21976](https://issues.apache.org/jira/browse/HBASE-21976) | Deal with RetryImmediatelyException for batching request | Major | asyncclient, Client |
| [HBASE-21082](https://issues.apache.org/jira/browse/HBASE-21082) | Reimplement assign/unassign related procedure metrics | Critical | amv2, metrics |
| [HBASE-21916](https://issues.apache.org/jira/browse/HBASE-21916) | Abstract an ByteBuffAllocator to allocate/free ByteBuffer in ByteBufferPool | Major | . |
| [HBASE-21820](https://issues.apache.org/jira/browse/HBASE-21820) | Implement CLUSTER quota scope | Major | . |
| [HBASE-21927](https://issues.apache.org/jira/browse/HBASE-21927) | Always fail the locate request when error occur | Major | asyncclient, Client |
| [HBASE-21944](https://issues.apache.org/jira/browse/HBASE-21944) | Validate put for batch operation | Major | asyncclient, Client |
| [HBASE-21945](https://issues.apache.org/jira/browse/HBASE-21945) | Maintain the original order when sending batch request | Major | asyncclient, Client |
| [HBASE-21783](https://issues.apache.org/jira/browse/HBASE-21783) | Support exceed user/table/ns throttle quota if region server has available quota | Major | . |
| [HBASE-21930](https://issues.apache.org/jira/browse/HBASE-21930) | Deal with ScannerResetException when opening region scanner | Major | asyncclient, Client |
| [HBASE-21907](https://issues.apache.org/jira/browse/HBASE-21907) | Should set priority for rpc request | Major | asyncclient, Client |
| [HBASE-21909](https://issues.apache.org/jira/browse/HBASE-21909) | Validate the put instance before executing in AsyncTable.put method | Major | asyncclient, Client |
| [HBASE-21814](https://issues.apache.org/jira/browse/HBASE-21814) | Remove the TODO in AccessControlLists#addUserPermission | Major | . |
| [HBASE-19889](https://issues.apache.org/jira/browse/HBASE-19889) | Revert Workaround: Purge User API building from branch-2 so can make a beta-1 | Major | website |
| [HBASE-21838](https://issues.apache.org/jira/browse/HBASE-21838) | Create a special ReplicationEndpoint just for verifying the WAL entries are fine | Major | Replication, wal |
| [HBASE-21829](https://issues.apache.org/jira/browse/HBASE-21829) | Use FutureUtils.addListener instead of calling whenComplete directly | Major | asyncclient, Client |
| [HBASE-21828](https://issues.apache.org/jira/browse/HBASE-21828) | Make sure we do not return CompletionException when locating region | Major | asyncclient, Client |
| [HBASE-21764](https://issues.apache.org/jira/browse/HBASE-21764) | Size of in-memory compaction thread pool should be configurable | Major | Compaction, in-memory-compaction |
| [HBASE-21739](https://issues.apache.org/jira/browse/HBASE-21739) | Move grant/revoke from regionserver to master | Major | . |
| [HBASE-21799](https://issues.apache.org/jira/browse/HBASE-21799) | Update branch-2 version to 2.3.0-SNAPSHOT | Major | build |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-24217](https://issues.apache.org/jira/browse/HBASE-24217) | Add hadoop 3.2.x support | Major | . |
| [HBASE-21745](https://issues.apache.org/jira/browse/HBASE-21745) | Make HBCK2 be able to fix issues other than region assignment | Critical | hbase-operator-tools, hbck2 |
| [HBASE-22833](https://issues.apache.org/jira/browse/HBASE-22833) | MultiRowRangeFilter should provide a method for creating a filter which is functionally equivalent to multiple prefix filters | Minor | Client |
| [HBASE-24635](https://issues.apache.org/jira/browse/HBASE-24635) | Split TestMetaWithReplicas | Major | test |
| [HBASE-24646](https://issues.apache.org/jira/browse/HBASE-24646) | Set the log level for ScheduledChore to INFO in HBTU | Major | test |
| [HBASE-24631](https://issues.apache.org/jira/browse/HBASE-24631) | Loosen Dockerfile pinned package versions of the "debian-revision" | Major | build |
| [HBASE-23055](https://issues.apache.org/jira/browse/HBASE-23055) | Alter hbase:meta | Major | meta |
| [HBASE-24611](https://issues.apache.org/jira/browse/HBASE-24611) | Bring back old constructor of SnapshotDescription | Major | . |
| [HBASE-24547](https://issues.apache.org/jira/browse/HBASE-24547) | Thrift support for HBASE-23941 | Major | . |
| [HBASE-24535](https://issues.apache.org/jira/browse/HBASE-24535) | Tweak the master registry docs for branch-2 | Major | Client, master |
| [HBASE-24367](https://issues.apache.org/jira/browse/HBASE-24367) | ScheduledChore log elapsed timespan in a human-friendly format | Minor | master, regionserver |
| [HBASE-24500](https://issues.apache.org/jira/browse/HBASE-24500) | The behavior of RegionInfoBuilder.newBuilder(RegionInfo) is strange | Blocker | Client, read replicas |
| [HBASE-24418](https://issues.apache.org/jira/browse/HBASE-24418) | Consolidate Normalizer implementations | Major | master, Normalizer |
| [HBASE-24477](https://issues.apache.org/jira/browse/HBASE-24477) | Move ConfigurationObserver and related classes to hbase-common | Minor | conf |
| [HBASE-24417](https://issues.apache.org/jira/browse/HBASE-24417) | update copyright notices year to 2020 | Major | documentation |
| [HBASE-24408](https://issues.apache.org/jira/browse/HBASE-24408) | Introduce a general 'local region' to store data on master | Blocker | master |
| [HBASE-24271](https://issues.apache.org/jira/browse/HBASE-24271) | Set values in \`conf/hbase-site.xml\` that enable running on \`LocalFileSystem\` out of the box | Major | . |
| [HBASE-24295](https://issues.apache.org/jira/browse/HBASE-24295) | [Chaos Monkey] abstract logging through the class hierarchy | Minor | integration tests |
| [HBASE-24258](https://issues.apache.org/jira/browse/HBASE-24258) | [Hadoop3.3] Update license for org.ow2.asm:\* | Minor | dependencies |
| [HBASE-24301](https://issues.apache.org/jira/browse/HBASE-24301) | Update Apache POM to version 23 | Minor | . |
| [HBASE-24285](https://issues.apache.org/jira/browse/HBASE-24285) | Move to hbase-thirdparty-3.3.0 | Major | . |
| [HBASE-24249](https://issues.apache.org/jira/browse/HBASE-24249) | Move code in FSHDFSUtils to FSUtils and mark related classes as final | Major | Filesystem Integration |
| [HBASE-24264](https://issues.apache.org/jira/browse/HBASE-24264) | Disable TestNettyIPC.testHedgedAsyncEcho | Major | IPC/RPC |
| [HBASE-23896](https://issues.apache.org/jira/browse/HBASE-23896) | Snapshot owner cannot delete snapshot when ACL is enabled and Kerberos is not enabled | Major | . |
| [HBASE-24072](https://issues.apache.org/jira/browse/HBASE-24072) | Nightlies reporting OutOfMemoryError: unable to create new native thread | Major | test |
| [HBASE-24194](https://issues.apache.org/jira/browse/HBASE-24194) | Refactor BufferedEncodedSeeker anonymous classes to named inner class | Minor | . |
| [HBASE-23779](https://issues.apache.org/jira/browse/HBASE-23779) | Up the default fork count to make builds complete faster; make count relative to CPU count | Major | test |
| [HBASE-24140](https://issues.apache.org/jira/browse/HBASE-24140) | Move CandidateGenerator out of StochasticLoadBalancer | Major | . |
| [HBASE-24156](https://issues.apache.org/jira/browse/HBASE-24156) | Make ZK registry the default for branch-2 and branch-2.3 | Major | Client |
| [HBASE-24138](https://issues.apache.org/jira/browse/HBASE-24138) | Ensure StochasticLoadBalancer can log details of decision to not run balancer | Major | Balancer, Operability |
| [HBASE-24049](https://issues.apache.org/jira/browse/HBASE-24049) | "Packaging and Integration" check fails | Major | build |
| [HBASE-24084](https://issues.apache.org/jira/browse/HBASE-24084) | Fix missing jdk8 dependencies in hbase-assembly/hadoop-two-compat | Major | build, master |
| [HBASE-24092](https://issues.apache.org/jira/browse/HBASE-24092) | Fix links to build reports generated by nightly job | Minor | build |
| [HBASE-24078](https://issues.apache.org/jira/browse/HBASE-24078) | SpotBugs check automatically skip inapplicable modules | Minor | build, test |
| [HBASE-20467](https://issues.apache.org/jira/browse/HBASE-20467) | Precommit personality should only run checkstyle once if we're going to run it at the root. | Minor | community, test |
| [HBASE-24000](https://issues.apache.org/jira/browse/HBASE-24000) | Simplify CommonFSUtils after upgrading to hadoop 2.10.0 | Major | hadoop2, wal |
| [HBASE-24002](https://issues.apache.org/jira/browse/HBASE-24002) | shadedjars check does not propagate --hadoop-profile | Major | build |
| [HBASE-23980](https://issues.apache.org/jira/browse/HBASE-23980) | Use enforcer plugin to print JVM info in maven output | Minor | build |
| [HBASE-24030](https://issues.apache.org/jira/browse/HBASE-24030) | Add necessary validations to HRegion.checkAndMutate() and HRegion.checkAndRowMutate() | Major | . |
| [HBASE-23861](https://issues.apache.org/jira/browse/HBASE-23861) | Reconcile Hadoop version | Major | dependencies |
| [HBASE-23971](https://issues.apache.org/jira/browse/HBASE-23971) | protoc warns: "no protobuf syntax specified" | Minor | Protobufs |
| [HBASE-24004](https://issues.apache.org/jira/browse/HBASE-24004) | Include hadoop version in Nightly report name | Trivial | build |
| [HBASE-23986](https://issues.apache.org/jira/browse/HBASE-23986) | Bump hadoop-two.version to 2.10.0 on master and branch-2 | Major | build, dependencies, hadoop2 |
| [HBASE-23978](https://issues.apache.org/jira/browse/HBASE-23978) | Dockerfiles reusing stale apt sources info | Major | build |
| [HBASE-23077](https://issues.apache.org/jira/browse/HBASE-23077) | move entirely to spotbugs | Major | build, test |
| [HBASE-23945](https://issues.apache.org/jira/browse/HBASE-23945) | Dockerfiles showing hadolint check failures | Minor | build |
| [HBASE-18418](https://issues.apache.org/jira/browse/HBASE-18418) | Remove apache\_hbase\_topology from dev-support | Minor | . |
| [HBASE-23874](https://issues.apache.org/jira/browse/HBASE-23874) | Move Jira-attached file precommit definition from script in Jenkins config to dev-support | Minor | build |
| [HBASE-23854](https://issues.apache.org/jira/browse/HBASE-23854) | Documentation update of external\_apis.adoc#example-scala-code | Trivial | documentation |
| [HBASE-23872](https://issues.apache.org/jira/browse/HBASE-23872) | [Flakey Test] TestGenerateDelegationToken; Master not initialized after 200000ms | Major | flakies |
| [HBASE-23866](https://issues.apache.org/jira/browse/HBASE-23866) | More test classifications | Trivial | test |
| [HBASE-23865](https://issues.apache.org/jira/browse/HBASE-23865) | Up flakey history from 5 to 10 | Major | . |
| [HBASE-23774](https://issues.apache.org/jira/browse/HBASE-23774) | Announce user-zh list | Trivial | website |
| [HBASE-23751](https://issues.apache.org/jira/browse/HBASE-23751) | Move core to hbase-thirdparty 3.2.0 | Major | . |
| [HBASE-23661](https://issues.apache.org/jira/browse/HBASE-23661) | Reduce number of Checkstyle violations in hbase-rest | Minor | . |
| [HBASE-23625](https://issues.apache.org/jira/browse/HBASE-23625) | Reduce number of Checkstyle violations in hbase-common | Minor | . |
| [HBASE-23335](https://issues.apache.org/jira/browse/HBASE-23335) | Improve cost functions array copy in StochasticLoadBalancer | Minor | . |
| [HBASE-23700](https://issues.apache.org/jira/browse/HBASE-23700) | Upgrade checkstyle and plugin versions | Minor | build |
| [HBASE-23652](https://issues.apache.org/jira/browse/HBASE-23652) | Move the unsupported procedure type check before migrating to RegionProcedureStore | Blocker | master |
| [HBASE-23687](https://issues.apache.org/jira/browse/HBASE-23687) | DEBUG logging cleanup | Trivial | . |
| [HBASE-23664](https://issues.apache.org/jira/browse/HBASE-23664) | Upgrade JUnit to 4.13 | Minor | integration tests, test |
| [HBASE-23628](https://issues.apache.org/jira/browse/HBASE-23628) | Replace Apache Commons Digest Base64 with JDK8 Base64 | Minor | dependencies |
| [HBASE-23642](https://issues.apache.org/jira/browse/HBASE-23642) | Reintroduce ReplicationUtils.contains as deprecated | Major | Replication |
| [HBASE-23604](https://issues.apache.org/jira/browse/HBASE-23604) | Clarify AsyncRegistry usage in the code | Minor | Client |
| [HBASE-23374](https://issues.apache.org/jira/browse/HBASE-23374) | ExclusiveMemHFileBlock’s allocator should not be hardcoded as ByteBuffAllocator.HEAP | Minor | . |
| [HBASE-23575](https://issues.apache.org/jira/browse/HBASE-23575) | Remove dead code from AsyncRegistry interface | Minor | Client |
| [HBASE-23556](https://issues.apache.org/jira/browse/HBASE-23556) | Minor ChoreService Cleanup | Minor | . |
| [HBASE-23298](https://issues.apache.org/jira/browse/HBASE-23298) | Refactor LogRecoveredEditsOutputSink and BoundedLogWriterCreationOutputSink | Major | . |
| [HBASE-23234](https://issues.apache.org/jira/browse/HBASE-23234) | Provide .editorconfig based on checkstyle configuration | Major | build, tooling |
| [HBASE-23230](https://issues.apache.org/jira/browse/HBASE-23230) | Enforce member visibility in HRegionServer | Major | regionserver |
| [HBASE-22888](https://issues.apache.org/jira/browse/HBASE-22888) | Share some stuffs with the initial reader when new stream reader created | Major | HFile, regionserver |
| [HBASE-23236](https://issues.apache.org/jira/browse/HBASE-23236) | Upgrade to yetus 0.11.1 | Major | build |
| [HBASE-23250](https://issues.apache.org/jira/browse/HBASE-23250) | Log message about CleanerChore delegate initialization should be at INFO | Minor | master, Operability |
| [HBASE-23227](https://issues.apache.org/jira/browse/HBASE-23227) | Upgrade jackson-databind to 2.9.10.1 to avoid recent CVEs | Blocker | dependencies, REST, security |
| [HBASE-23129](https://issues.apache.org/jira/browse/HBASE-23129) | Move core to use hbase-thirdparty-3.1.1 | Major | . |
| [HBASE-23053](https://issues.apache.org/jira/browse/HBASE-23053) | Disable concurrent nightly builds | Minor | build |
| [HBASE-23023](https://issues.apache.org/jira/browse/HBASE-23023) | upgrade shellcheck used to test in nightly and precommit | Major | build |
| [HBASE-23032](https://issues.apache.org/jira/browse/HBASE-23032) | Upgrade to Curator 4.2.0 | Major | . |
| [HBASE-23047](https://issues.apache.org/jira/browse/HBASE-23047) | ChecksumUtil.validateChecksum logs an INFO message inside a "if(LOG.isTraceEnabled())" block. | Minor | . |
| [HBASE-23046](https://issues.apache.org/jira/browse/HBASE-23046) | Remove compatibility case from truncate command | Minor | shell |
| [HBASE-21056](https://issues.apache.org/jira/browse/HBASE-21056) | Findbugs false positive: BucketCache.persistToFile may fail to clean up java.io.OutputStream | Minor | BucketCache |
| [HBASE-23024](https://issues.apache.org/jira/browse/HBASE-23024) | Replace Exception.initCause() with Constructor args | Minor | . |
| [HBASE-22642](https://issues.apache.org/jira/browse/HBASE-22642) | Make move operations of RSGroup idempotent | Major | rsgroup |
| [HBASE-22895](https://issues.apache.org/jira/browse/HBASE-22895) | Fix the flakey TestSpaceQuotas | Major | Quotas, test |
| [HBASE-22910](https://issues.apache.org/jira/browse/HBASE-22910) | Enable TestMultiVersionConcurrencyControl | Major | test |
| [HBASE-22913](https://issues.apache.org/jira/browse/HBASE-22913) | Use Hadoop label for nightly builds | Major | build |
| [HBASE-22911](https://issues.apache.org/jira/browse/HBASE-22911) | fewer concurrent github PR builds | Critical | build |
| [HBASE-21400](https://issues.apache.org/jira/browse/HBASE-21400) | correct spelling error of 'initilize' in comment | Trivial | documentation |
| [HBASE-22382](https://issues.apache.org/jira/browse/HBASE-22382) | Refactor tests in TestFromClientSide | Major | test |
| [HBASE-22594](https://issues.apache.org/jira/browse/HBASE-22594) | Clean up for backup examples | Minor | . |
| [HBASE-21606](https://issues.apache.org/jira/browse/HBASE-21606) | Document use of the meta table load metrics added in HBASE-19722 | Critical | documentation, meta, metrics, Operability |
| [HBASE-19230](https://issues.apache.org/jira/browse/HBASE-19230) | Write up fixVersion policy from dev discussion in refguide | Major | documentation |
| [HBASE-22651](https://issues.apache.org/jira/browse/HBASE-22651) | ErrorProne issue in TestByteBufferArray | Major | test |
| [HBASE-22572](https://issues.apache.org/jira/browse/HBASE-22572) | Javadoc Warnings: @link reference not found | Trivial | documentation |
| [HBASE-22597](https://issues.apache.org/jira/browse/HBASE-22597) | Upgrading commons-lang to 3.9 | Major | dependencies |
| [HBASE-22556](https://issues.apache.org/jira/browse/HBASE-22556) | [DOCS] Backport HBASE-15557 to branch-1 and branch-2 | Major | . |
| [HBASE-22566](https://issues.apache.org/jira/browse/HBASE-22566) | Call out default compaction throttling for 2.x in Book | Major | documentation |
| [HBASE-22560](https://issues.apache.org/jira/browse/HBASE-22560) | Upgrade to Jetty 9.3.latest and Jackson 2.9.latest | Major | dependencies |
| [HBASE-22373](https://issues.apache.org/jira/browse/HBASE-22373) | maven-eclipse-plugin does not define version in every module | Minor | . |
| [HBASE-21536](https://issues.apache.org/jira/browse/HBASE-21536) | Fix completebulkload usage instructions | Trivial | documentation, mapreduce |
| [HBASE-22449](https://issues.apache.org/jira/browse/HBASE-22449) | https everywhere in Maven metadata | Minor | . |
| [HBASE-22406](https://issues.apache.org/jira/browse/HBASE-22406) | skip generating rdoc when building gems in our docker image for running yetus | Critical | build, test |
| [HBASE-22375](https://issues.apache.org/jira/browse/HBASE-22375) | Promote AccessChecker to LimitedPrivate(Coprocessor) | Minor | Coprocessors, security |
| [HBASE-21714](https://issues.apache.org/jira/browse/HBASE-21714) | Deprecated isTableAvailableWithSplit method in thrift module | Major | Thrift |
| [HBASE-22359](https://issues.apache.org/jira/browse/HBASE-22359) | Backport of HBASE-21371 misses activation-api license information | Minor | build, community |
| [HBASE-22174](https://issues.apache.org/jira/browse/HBASE-22174) | Remove error prone from our precommit javac check | Major | build |
| [HBASE-22321](https://issues.apache.org/jira/browse/HBASE-22321) | Add 1.5 release line to the Hadoop supported versions table | Minor | documentation |
| [HBASE-22083](https://issues.apache.org/jira/browse/HBASE-22083) | move eclipse specific configs into a profile | Minor | build |
| [HBASE-22231](https://issues.apache.org/jira/browse/HBASE-22231) | Remove unused and \* imports | Minor | . |
| [HBASE-22307](https://issues.apache.org/jira/browse/HBASE-22307) | Deprecated Preemptive Fail Fast | Major | Client |
| [HBASE-22304](https://issues.apache.org/jira/browse/HBASE-22304) | Fix remaining Checkstyle issues in hbase-endpoint | Trivial | . |
| [HBASE-22020](https://issues.apache.org/jira/browse/HBASE-22020) | upgrade to yetus 0.9.0 | Major | build, community |
| [HBASE-22240](https://issues.apache.org/jira/browse/HBASE-22240) | [backport] HBASE-19762 Fix Checkstyle errors in hbase-http | Major | . |
| [HBASE-22187](https://issues.apache.org/jira/browse/HBASE-22187) | Remove usage of deprecated ClusterConnection.clearRegionCache | Trivial | Client |
| [HBASE-22203](https://issues.apache.org/jira/browse/HBASE-22203) | Reformat DemoClient.java | Trivial | . |
| [HBASE-22189](https://issues.apache.org/jira/browse/HBASE-22189) | Remove usage of StoreFile.getModificationTimeStamp | Trivial | . |
| [HBASE-22108](https://issues.apache.org/jira/browse/HBASE-22108) | Avoid passing null in Admin methods | Major | Admin |
| [HBASE-22007](https://issues.apache.org/jira/browse/HBASE-22007) | Add restoreSnapshot and cloneSnapshot with acl methods in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22131](https://issues.apache.org/jira/browse/HBASE-22131) | Delete the patches in hbase-protocol-shaded module | Major | build, Protobufs |
| [HBASE-22099](https://issues.apache.org/jira/browse/HBASE-22099) | Backport HBASE-21895 "Error prone upgrade" to branch-2 | Major | build |
| [HBASE-22052](https://issues.apache.org/jira/browse/HBASE-22052) | pom cleaning; filter out jersey-core in hadoop2 to match hadoop3 and remove redunant version specifications | Major | . |
| [HBASE-22065](https://issues.apache.org/jira/browse/HBASE-22065) | Add listTableDescriptors(List\) method in AsyncAdmin | Major | Admin |
| [HBASE-22063](https://issues.apache.org/jira/browse/HBASE-22063) | Deprecated Admin.deleteSnapshot(byte[]) | Major | Admin |
| [HBASE-22042](https://issues.apache.org/jira/browse/HBASE-22042) | Missing @Override annotation for RawAsyncTableImpl.scan | Major | asyncclient, Client |
| [HBASE-22044](https://issues.apache.org/jira/browse/HBASE-22044) | ByteBufferUtils should not be IA.Public API | Major | compatibility, util |
| [HBASE-22001](https://issues.apache.org/jira/browse/HBASE-22001) | Polish the Admin interface | Major | Admin, Client |
| [HBASE-21969](https://issues.apache.org/jira/browse/HBASE-21969) | Improve the update of destination rsgroup of RSGroupInfoManagerImpl#moveTables() | Minor | rsgroup |
| [HBASE-21057](https://issues.apache.org/jira/browse/HBASE-21057) | upgrade to latest spotbugs | Minor | community, test |
| [HBASE-21888](https://issues.apache.org/jira/browse/HBASE-21888) | Add a isClosed method to AsyncConnection | Major | asyncclient, Client |
| [HBASE-21884](https://issues.apache.org/jira/browse/HBASE-21884) | Fix box/unbox findbugs warning in secure bulk load | Minor | . |
| [HBASE-21859](https://issues.apache.org/jira/browse/HBASE-21859) | Add clearRegionLocationCache method for AsyncConnection | Major | asyncclient, Client |
| [HBASE-21853](https://issues.apache.org/jira/browse/HBASE-21853) | update copyright notices to 2019 | Major | documentation |
| [HBASE-21812](https://issues.apache.org/jira/browse/HBASE-21812) | Address ruby static analysis for bin module [2nd pass] | Minor | scripts |
| [HBASE-21791](https://issues.apache.org/jira/browse/HBASE-21791) | Upgrade thrift dependency to 0.12.0 | Blocker | Thrift |
## Release 2.2.0 - Unreleased (as of 2019-06-11)
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21991](https://issues.apache.org/jira/browse/HBASE-21991) | Fix MetaMetrics issues - [Race condition, Faulty remove logic], few improvements | Major | Coprocessors, metrics |
| [HBASE-22399](https://issues.apache.org/jira/browse/HBASE-22399) | Change default hadoop-two.version to 2.8.x and remove the 2.7.x hadoop checks | Major | build, hadoop2 |
| [HBASE-21082](https://issues.apache.org/jira/browse/HBASE-21082) | Reimplement assign/unassign related procedure metrics | Critical | amv2, metrics |
| [HBASE-20587](https://issues.apache.org/jira/browse/HBASE-20587) | Replace Jackson with shaded thirdparty gson | Major | dependencies |
| [HBASE-21727](https://issues.apache.org/jira/browse/HBASE-21727) | Simplify documentation around client timeout | Minor | . |
| [HBASE-21684](https://issues.apache.org/jira/browse/HBASE-21684) | Throw DNRIOE when connection or rpc client is closed | Major | asyncclient, Client |
| [HBASE-21792](https://issues.apache.org/jira/browse/HBASE-21792) | Mark HTableMultiplexer as deprecated and remove it in 3.0.0 | Major | Client |
| [HBASE-21657](https://issues.apache.org/jira/browse/HBASE-21657) | PrivateCellUtil#estimatedSerializedSizeOf has been the bottleneck in 100% scan case. | Major | Performance |
| [HBASE-21560](https://issues.apache.org/jira/browse/HBASE-21560) | Return a new TableDescriptor for MasterObserver#preModifyTable to allow coprocessor modify the TableDescriptor | Major | Coprocessors |
| [HBASE-21492](https://issues.apache.org/jira/browse/HBASE-21492) | CellCodec Written To WAL Before It's Verified | Critical | wal |
| [HBASE-21452](https://issues.apache.org/jira/browse/HBASE-21452) | Illegal character in hbase counters group name | Major | spark |
| [HBASE-21158](https://issues.apache.org/jira/browse/HBASE-21158) | Empty qualifier cell should not be returned if it does not match QualifierFilter | Critical | Filters |
| [HBASE-21223](https://issues.apache.org/jira/browse/HBASE-21223) | [amv2] Remove abort\_procedure from shell | Critical | amv2, hbck2, shell |
| [HBASE-20881](https://issues.apache.org/jira/browse/HBASE-20881) | Introduce a region transition procedure to handle all the state transition for a region | Major | amv2, proc-v2 |
| [HBASE-20884](https://issues.apache.org/jira/browse/HBASE-20884) | Replace usage of our Base64 implementation with java.util.Base64 | Major | . |
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-22148](https://issues.apache.org/jira/browse/HBASE-22148) | Provide an alternative to CellUtil.setTimestamp | Blocker | API, Coprocessors |
| [HBASE-21815](https://issues.apache.org/jira/browse/HBASE-21815) | Make isTrackingMetrics and getMetrics of ScannerContext public | Minor | . |
| [HBASE-21926](https://issues.apache.org/jira/browse/HBASE-21926) | Profiler servlet | Major | master, Operability, regionserver |
| [HBASE-20886](https://issues.apache.org/jira/browse/HBASE-20886) | [Auth] Support keytab login in hbase client | Critical | asyncclient, Client, security |
| [HBASE-17942](https://issues.apache.org/jira/browse/HBASE-17942) | Disable region splits and merges per table | Major | . |
| [HBASE-21753](https://issues.apache.org/jira/browse/HBASE-21753) | Support getting the locations for all the replicas of a region | Major | Client |
| [HBASE-20636](https://issues.apache.org/jira/browse/HBASE-20636) | Introduce two bloom filter type : ROWPREFIX\_FIXED\_LENGTH and ROWPREFIX\_DELIMITED | Major | HFile, regionserver, Scanners |
| [HBASE-20649](https://issues.apache.org/jira/browse/HBASE-20649) | Validate HFiles do not have PREFIX\_TREE DataBlockEncoding | Minor | Operability, tooling |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-22284](https://issues.apache.org/jira/browse/HBASE-22284) | optimization StringBuilder.append of AbstractMemStore.toString | Trivial | . |
| [HBASE-22523](https://issues.apache.org/jira/browse/HBASE-22523) | Refactor RegionStates#getAssignmentsByTable to make it easy to understand | Major | . |
| [HBASE-22511](https://issues.apache.org/jira/browse/HBASE-22511) | More missing /rs-status links | Minor | UI |
| [HBASE-22496](https://issues.apache.org/jira/browse/HBASE-22496) | UnsafeAccess.unsafeCopy should not copy more than UNSAFE\_COPY\_THRESHOLD on each iteration | Major | . |
| [HBASE-22488](https://issues.apache.org/jira/browse/HBASE-22488) | Cleanup the explicit timeout value for test methods | Major | . |
| [HBASE-22411](https://issues.apache.org/jira/browse/HBASE-22411) | Refactor codes of moving reigons in RSGroup | Major | rsgroup |
| [HBASE-22467](https://issues.apache.org/jira/browse/HBASE-22467) | WebUI changes to enable Apache Knox UI proxying | Major | UI |
| [HBASE-22474](https://issues.apache.org/jira/browse/HBASE-22474) | Add --mvn-custom-repo parameter to yetus calls | Minor | . |
| [HBASE-20305](https://issues.apache.org/jira/browse/HBASE-20305) | Add option to SyncTable that skip deletes on target cluster | Minor | mapreduce |
| [HBASE-21784](https://issues.apache.org/jira/browse/HBASE-21784) | Dump replication queue should show list of wal files ordered chronologically | Major | Replication, tooling |
| [HBASE-22384](https://issues.apache.org/jira/browse/HBASE-22384) | Formatting issues in administration section of book | Minor | community, documentation |
| [HBASE-21658](https://issues.apache.org/jira/browse/HBASE-21658) | Should get the meta replica number from zk instead of config at client side | Critical | Client |
| [HBASE-22365](https://issues.apache.org/jira/browse/HBASE-22365) | Region may be opened on two RegionServers | Blocker | amv2 |
| [HBASE-22392](https://issues.apache.org/jira/browse/HBASE-22392) | Remove extra/useless + | Trivial | . |
| [HBASE-20494](https://issues.apache.org/jira/browse/HBASE-20494) | Upgrade com.yammer.metrics dependency | Major | dependencies |
| [HBASE-22358](https://issues.apache.org/jira/browse/HBASE-22358) | Change rubocop configuration for method length | Minor | community, shell |
| [HBASE-22379](https://issues.apache.org/jira/browse/HBASE-22379) | Fix Markdown for "Voting on Release Candidates" in book | Minor | community, documentation |
| [HBASE-22109](https://issues.apache.org/jira/browse/HBASE-22109) | Update hbase shaded content checker after guava update in hadoop branch-3.0 to 27.0-jre | Minor | . |
| [HBASE-22087](https://issues.apache.org/jira/browse/HBASE-22087) | Update LICENSE/shading for the dependencies from the latest Hadoop trunk | Minor | hadoop3 |
| [HBASE-22341](https://issues.apache.org/jira/browse/HBASE-22341) | Add explicit guidelines for removing deprecations in book | Major | API, community, documentation |
| [HBASE-22225](https://issues.apache.org/jira/browse/HBASE-22225) | Profiler tab on Master/RS UI not working w/o comprehensive message | Minor | UI |
| [HBASE-22291](https://issues.apache.org/jira/browse/HBASE-22291) | Fix recovery of recovered.edits files under root dir | Major | . |
| [HBASE-22283](https://issues.apache.org/jira/browse/HBASE-22283) | Print row and table information when failed to get region location | Major | Client, logging |
| [HBASE-22296](https://issues.apache.org/jira/browse/HBASE-22296) | Remove TestFromClientSide.testGetStartEndKeysWithRegionReplicas | Major | test |
| [HBASE-22250](https://issues.apache.org/jira/browse/HBASE-22250) | The same constants used in many places should be placed in constant classes | Minor | Client, conf, regionserver |
| [HBASE-20586](https://issues.apache.org/jira/browse/HBASE-20586) | SyncTable tool: Add support for cross-realm remote clusters | Major | mapreduce, Operability, Replication |
| [HBASE-21257](https://issues.apache.org/jira/browse/HBASE-21257) | misspelled words.[occured -\> occurred] | Trivial | . |
| [HBASE-22193](https://issues.apache.org/jira/browse/HBASE-22193) | Add backoff when region failed open too many times | Major | . |
| [HBASE-22188](https://issues.apache.org/jira/browse/HBASE-22188) | Make TestSplitMerge more stable | Major | test |
| [HBASE-22097](https://issues.apache.org/jira/browse/HBASE-22097) | Modify the description of split command in shell | Trivial | shell |
| [HBASE-21964](https://issues.apache.org/jira/browse/HBASE-21964) | unset Quota by Throttle Type | Major | master |
| [HBASE-22093](https://issues.apache.org/jira/browse/HBASE-22093) | Combine TestRestoreSnapshotFromClientWithRegionReplicas to CloneSnapshotFromClientAfterSplittingRegionTestBase#testCloneSnapshotAfterSplittingRegion | Major | . |
| [HBASE-22009](https://issues.apache.org/jira/browse/HBASE-22009) | Improve RSGroupInfoManagerImpl#getDefaultServers() | Minor | rsgroup |
| [HBASE-22032](https://issues.apache.org/jira/browse/HBASE-22032) | KeyValue validation should check for null byte array | Major | . |
| [HBASE-21667](https://issues.apache.org/jira/browse/HBASE-21667) | Move to latest ASF Parent POM | Minor | build |
| [HBASE-21810](https://issues.apache.org/jira/browse/HBASE-21810) | bulkload support set hfile compression on client | Major | mapreduce |
| [HBASE-21987](https://issues.apache.org/jira/browse/HBASE-21987) | Simplify RSGroupInfoManagerImpl#flushConfig() for offline mode | Minor | rsgroup |
| [HBASE-21871](https://issues.apache.org/jira/browse/HBASE-21871) | Support to specify a peer table name in VerifyReplication tool | Major | . |
| [HBASE-21255](https://issues.apache.org/jira/browse/HBASE-21255) | [acl] Refactor TablePermission into three classes (Global, Namespace, Table) | Major | . |
| [HBASE-21410](https://issues.apache.org/jira/browse/HBASE-21410) | A helper page that help find all problematic regions and procedures | Major | . |
| [HBASE-20734](https://issues.apache.org/jira/browse/HBASE-20734) | Colocate recovered edits directory with hbase.wal.dir | Major | MTTR, Recovery, wal |
| [HBASE-20401](https://issues.apache.org/jira/browse/HBASE-20401) | Make \`MAX\_WAIT\` and \`waitIfNotFinished\` in CleanerContext configurable | Minor | master |
| [HBASE-21481](https://issues.apache.org/jira/browse/HBASE-21481) | [acl] Superuser's permissions should not be granted or revoked by any non-su global admin | Major | . |
| [HBASE-21967](https://issues.apache.org/jira/browse/HBASE-21967) | Split TestServerCrashProcedure and TestServerCrashProcedureWithReplicas | Major | . |
| [HBASE-21867](https://issues.apache.org/jira/browse/HBASE-21867) | Support multi-threads in HFileArchiver | Major | . |
| [HBASE-21932](https://issues.apache.org/jira/browse/HBASE-21932) | Use Runtime.getRuntime().halt to terminate regionserver when abort timeout | Major | . |
| [HBASE-21875](https://issues.apache.org/jira/browse/HBASE-21875) | Change the retry logic in RSProcedureDispatcher to 'retry by default, only if xxx' | Major | proc-v2 |
| [HBASE-21780](https://issues.apache.org/jira/browse/HBASE-21780) | Avoid a wide line on the RegionServer webUI for many ZooKeeper servers | Minor | UI, Usability |
| [HBASE-21636](https://issues.apache.org/jira/browse/HBASE-21636) | Enhance the shell scan command to support missing scanner specifications like ReadType, IsolationLevel etc. | Major | shell |
| [HBASE-21857](https://issues.apache.org/jira/browse/HBASE-21857) | Do not need to check clusterKey if replicationEndpoint is provided when adding a peer | Major | . |
| [HBASE-21201](https://issues.apache.org/jira/browse/HBASE-21201) | Support to run VerifyReplication MR tool without peerid | Major | hbase-operator-tools |
| [HBASE-21816](https://issues.apache.org/jira/browse/HBASE-21816) | Print source cluster replication config directory | Trivial | Replication |
| [HBASE-19616](https://issues.apache.org/jira/browse/HBASE-19616) | Review of LogCleaner Class | Minor | . |
| [HBASE-21830](https://issues.apache.org/jira/browse/HBASE-21830) | Backport HBASE-20577 (Make Log Level page design consistent with the design of other pages in UI) to branch-2 | Major | UI, Usability |
| [HBASE-21833](https://issues.apache.org/jira/browse/HBASE-21833) | Use NettyAsyncFSWALConfigHelper.setEventLoopConfig to prevent creating too many netty event loop when executing TestHRegion | Minor | test |
| [HBASE-21634](https://issues.apache.org/jira/browse/HBASE-21634) | Print error message when user uses unacceptable values for LIMIT while setting quotas. | Minor | . |
| [HBASE-21789](https://issues.apache.org/jira/browse/HBASE-21789) | Rewrite MetaTableAccessor.multiMutate with Table.coprocessorService | Major | Client, Coprocessors |
| [HBASE-21689](https://issues.apache.org/jira/browse/HBASE-21689) | Make table/namespace specific current quota info available in shell(describe\_namespace & describe) | Minor | . |
| [HBASE-20215](https://issues.apache.org/jira/browse/HBASE-20215) | Rename CollectionUtils to ConcurrentMapUtils | Trivial | . |
| [HBASE-21720](https://issues.apache.org/jira/browse/HBASE-21720) | metric to measure how actions are distributed to servers within a MultiAction | Minor | Client, metrics, monitoring |
| [HBASE-21595](https://issues.apache.org/jira/browse/HBASE-21595) | Print thread's information and stack traces when RS is aborting forcibly | Minor | regionserver |
| [HBASE-20209](https://issues.apache.org/jira/browse/HBASE-20209) | Do Not Use Both Map containsKey and get Methods in Replication Sink | Trivial | Replication |
| [HBASE-21712](https://issues.apache.org/jira/browse/HBASE-21712) | Make submit-patch.py python3 compatible | Minor | tooling |
| [HBASE-21590](https://issues.apache.org/jira/browse/HBASE-21590) | Optimize trySkipToNextColumn in StoreScanner a bit | Critical | Performance, Scanners |
| [HBASE-21297](https://issues.apache.org/jira/browse/HBASE-21297) | ModifyTableProcedure can throw TNDE instead of IOE in case of REGION\_REPLICATION change | Minor | . |
| [HBASE-21700](https://issues.apache.org/jira/browse/HBASE-21700) | Simplify the implementation of RSGroupInfoManagerImpl | Major | rsgroup |
| [HBASE-21694](https://issues.apache.org/jira/browse/HBASE-21694) | Add append\_peer\_exclude\_tableCFs and remove\_peer\_exclude\_tableCFs shell commands | Major | . |
| [HBASE-21645](https://issues.apache.org/jira/browse/HBASE-21645) | Perform sanity check and disallow table creation/modification with region replication \< 1 | Minor | . |
| [HBASE-21360](https://issues.apache.org/jira/browse/HBASE-21360) | Disable printing of stack-trace in shell for quotas | Minor | shell |
| [HBASE-21662](https://issues.apache.org/jira/browse/HBASE-21662) | Add append\_peer\_exclude\_namespaces and remove\_peer\_exclude\_namespaces shell commands | Major | . |
| [HBASE-21659](https://issues.apache.org/jira/browse/HBASE-21659) | Avoid to load duplicate coprocessors in system config and table descriptor | Minor | . |
| [HBASE-21642](https://issues.apache.org/jira/browse/HBASE-21642) | CopyTable by reading snapshot and bulkloading will save a lot of time. | Major | . |
| [HBASE-21643](https://issues.apache.org/jira/browse/HBASE-21643) | Introduce two new region coprocessor method and deprecated postMutationBeforeWAL | Major | . |
| [HBASE-21640](https://issues.apache.org/jira/browse/HBASE-21640) | Remove the TODO when increment zero | Major | . |
| [HBASE-21631](https://issues.apache.org/jira/browse/HBASE-21631) | list\_quotas should print human readable values for LIMIT | Minor | shell |
| [HBASE-21635](https://issues.apache.org/jira/browse/HBASE-21635) | Use maven enforcer to ban imports from illegal packages | Major | build |
| [HBASE-21514](https://issues.apache.org/jira/browse/HBASE-21514) | Refactor CacheConfig | Major | . |
| [HBASE-21520](https://issues.apache.org/jira/browse/HBASE-21520) | TestMultiColumnScanner cost long time when using ROWCOL bloom type | Major | test |
| [HBASE-21554](https://issues.apache.org/jira/browse/HBASE-21554) | Show replication endpoint classname for replication peer on master web UI | Minor | UI |
| [HBASE-21549](https://issues.apache.org/jira/browse/HBASE-21549) | Add shell command for serial replication peer | Major | . |
| [HBASE-21283](https://issues.apache.org/jira/browse/HBASE-21283) | Add new shell command 'rit' for listing regions in transition | Minor | Operability, shell |
| [HBASE-21567](https://issues.apache.org/jira/browse/HBASE-21567) | Allow overriding configs starting up the shell | Major | shell |
| [HBASE-21413](https://issues.apache.org/jira/browse/HBASE-21413) | Empty meta log doesn't get split when restart whole cluster | Major | . |
| [HBASE-21524](https://issues.apache.org/jira/browse/HBASE-21524) | Unnecessary DEBUG log in ConnectionImplementation#isTableEnabled | Major | Client |
| [HBASE-21511](https://issues.apache.org/jira/browse/HBASE-21511) | Remove in progress snapshot check in SnapshotFileCache#getUnreferencedFiles | Minor | snapshots |
| [HBASE-21480](https://issues.apache.org/jira/browse/HBASE-21480) | Taking snapshot when RS crashes prevent we bring the regions online | Major | snapshots |
| [HBASE-21485](https://issues.apache.org/jira/browse/HBASE-21485) | Add more debug logs for remote procedure execution | Major | proc-v2 |
| [HBASE-21328](https://issues.apache.org/jira/browse/HBASE-21328) | add HBASE\_DISABLE\_HADOOP\_CLASSPATH\_LOOKUP switch to hbase-env.sh | Minor | documentation, Operability |
| [HBASE-19682](https://issues.apache.org/jira/browse/HBASE-19682) | Use Collections.emptyList() For Empty List Values | Minor | . |
| [HBASE-21388](https://issues.apache.org/jira/browse/HBASE-21388) | No need to instantiate MemStoreLAB for master which not carry table | Major | . |
| [HBASE-21325](https://issues.apache.org/jira/browse/HBASE-21325) | Force to terminate regionserver when abort hang in somewhere | Major | . |
| [HBASE-21385](https://issues.apache.org/jira/browse/HBASE-21385) | HTable.delete request use rpc call directly instead of AsyncProcess | Major | . |
| [HBASE-21318](https://issues.apache.org/jira/browse/HBASE-21318) | Make RefreshHFilesClient runnable | Minor | HFile |
| [HBASE-21263](https://issues.apache.org/jira/browse/HBASE-21263) | Mention compression algorithm along with other storefile details | Minor | . |
| [HBASE-21290](https://issues.apache.org/jira/browse/HBASE-21290) | No need to instantiate BlockCache for master which not carry table | Major | . |
| [HBASE-21256](https://issues.apache.org/jira/browse/HBASE-21256) | Improve IntegrationTestBigLinkedList for testing huge data | Major | integration tests |
| [HBASE-21251](https://issues.apache.org/jira/browse/HBASE-21251) | Refactor RegionMover | Major | Operability |
| [HBASE-21303](https://issues.apache.org/jira/browse/HBASE-21303) | [shell] clear\_deadservers with no args fails | Major | . |
| [HBASE-21098](https://issues.apache.org/jira/browse/HBASE-21098) | Improve Snapshot Performance with Temporary Snapshot Directory when rootDir on S3 | Major | . |
| [HBASE-21299](https://issues.apache.org/jira/browse/HBASE-21299) | List counts of actual region states in master UI tables section | Major | UI |
| [HBASE-21289](https://issues.apache.org/jira/browse/HBASE-21289) | Remove the log "'hbase.regionserver.maxlogs' was deprecated." in AbstractFSWAL | Minor | . |
| [HBASE-21185](https://issues.apache.org/jira/browse/HBASE-21185) | WALPrettyPrinter: Additional useful info to be printed by wal printer tool, for debugability purposes | Minor | Operability |
| [HBASE-21103](https://issues.apache.org/jira/browse/HBASE-21103) | nightly test cache of yetus install needs to be more thorough in verification | Major | test |
| [HBASE-21207](https://issues.apache.org/jira/browse/HBASE-21207) | Add client side sorting functionality in master web UI for table and region server details. | Minor | master, monitoring, UI, Usability |
| [HBASE-20857](https://issues.apache.org/jira/browse/HBASE-20857) | JMX - add Balancer status = enabled / disabled | Major | API, master, metrics, REST, tooling, Usability |
| [HBASE-21164](https://issues.apache.org/jira/browse/HBASE-21164) | reportForDuty to spew less log if master is initializing | Minor | regionserver |
| [HBASE-21204](https://issues.apache.org/jira/browse/HBASE-21204) | NPE when scan raw DELETE\_FAMILY\_VERSION and codec is not set | Major | . |
| [HBASE-20307](https://issues.apache.org/jira/browse/HBASE-20307) | LoadTestTool prints too much zookeeper logging | Minor | tooling |
| [HBASE-21155](https://issues.apache.org/jira/browse/HBASE-21155) | Save on a few log strings and some churn in wal splitter by skipping out early if no logs in dir | Trivial | . |
| [HBASE-21129](https://issues.apache.org/jira/browse/HBASE-21129) | Clean up duplicate codes in #equals and #hashCode methods of Filter | Minor | Filters |
| [HBASE-21157](https://issues.apache.org/jira/browse/HBASE-21157) | Split TableInputFormatScan to individual tests | Minor | test |
| [HBASE-21107](https://issues.apache.org/jira/browse/HBASE-21107) | add a metrics for netty direct memory | Minor | IPC/RPC |
| [HBASE-21153](https://issues.apache.org/jira/browse/HBASE-21153) | Shaded client jars should always build in relevant phase to avoid confusion | Major | build |
| [HBASE-21126](https://issues.apache.org/jira/browse/HBASE-21126) | Add ability for HBase Canary to ignore a configurable number of ZooKeeper down nodes | Minor | canary, Zookeeper |
| [HBASE-20749](https://issues.apache.org/jira/browse/HBASE-20749) | Upgrade our use of checkstyle to 8.6+ | Minor | build, community |
| [HBASE-21071](https://issues.apache.org/jira/browse/HBASE-21071) | HBaseTestingUtility::startMiniCluster() to use builder pattern | Major | test |
| [HBASE-20387](https://issues.apache.org/jira/browse/HBASE-20387) | flaky infrastructure should work for all branches | Critical | test |
| [HBASE-20469](https://issues.apache.org/jira/browse/HBASE-20469) | Directory used for sidelining old recovered edits files should be made configurable | Minor | . |
| [HBASE-20979](https://issues.apache.org/jira/browse/HBASE-20979) | Flaky test reporting should specify what JSON it needs and handle HTTP errors | Minor | test |
| [HBASE-20985](https://issues.apache.org/jira/browse/HBASE-20985) | add two attributes when we do normalization | Major | . |
| [HBASE-20965](https://issues.apache.org/jira/browse/HBASE-20965) | Separate region server report requests to new handlers | Major | Performance |
| [HBASE-20845](https://issues.apache.org/jira/browse/HBASE-20845) | Support set the consistency for Gets and Scans in thrift2 | Major | Thrift |
| [HBASE-20986](https://issues.apache.org/jira/browse/HBASE-20986) | Separate the config of block size when we do log splitting and write Hlog | Major | . |
| [HBASE-19036](https://issues.apache.org/jira/browse/HBASE-19036) | Add action in Chaos Monkey to restart Active Namenode | Minor | . |
| [HBASE-20856](https://issues.apache.org/jira/browse/HBASE-20856) | PITA having to set WAL provider in two places | Minor | Operability, wal |
| [HBASE-20935](https://issues.apache.org/jira/browse/HBASE-20935) | HStore.removeCompactedFiles should log in case it is unable to delete a file | Minor | . |
| [HBASE-20873](https://issues.apache.org/jira/browse/HBASE-20873) | Update doc for Endpoint-based Export | Minor | documentation |
| [HBASE-20672](https://issues.apache.org/jira/browse/HBASE-20672) | New metrics ReadRequestRate and WriteRequestRate | Minor | metrics |
| [HBASE-20617](https://issues.apache.org/jira/browse/HBASE-20617) | Upgrade/remove jetty-jsp | Minor | . |
| [HBASE-20396](https://issues.apache.org/jira/browse/HBASE-20396) | Remove redundant MBean from thrift JMX | Major | Thrift |
| [HBASE-20357](https://issues.apache.org/jira/browse/HBASE-20357) | AccessControlClient API Enhancement | Major | security |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-22563](https://issues.apache.org/jira/browse/HBASE-22563) | Reduce retained jobs for Jenkins pipelines | Major | . |
| [HBASE-22552](https://issues.apache.org/jira/browse/HBASE-22552) | Rewrite TestEndToEndSplitTransaction.testCanSplitJustAfterASplit | Major | test |
| [HBASE-22551](https://issues.apache.org/jira/browse/HBASE-22551) | TestMasterOperationsForRegionReplicas is flakey | Major | read replicas, test |
| [HBASE-22481](https://issues.apache.org/jira/browse/HBASE-22481) | Javadoc Warnings: reference not found | Trivial | documentation |
| [HBASE-22546](https://issues.apache.org/jira/browse/HBASE-22546) | TestRegionServerHostname#testRegionServerHostname fails reliably for me | Major | . |
| [HBASE-22534](https://issues.apache.org/jira/browse/HBASE-22534) | TestCellUtil fails when run on JDK11 | Minor | java, test |
| [HBASE-22536](https://issues.apache.org/jira/browse/HBASE-22536) | TestForeignExceptionSerialization fails when run on JDK11 | Minor | java |
| [HBASE-22535](https://issues.apache.org/jira/browse/HBASE-22535) | TestShellRSGroups fails when run on JDK11 | Minor | java, shell |
| [HBASE-22518](https://issues.apache.org/jira/browse/HBASE-22518) | yetus personality is treating branch-1.4 like earlier branches for hadoopcheck | Major | test |
| [HBASE-22513](https://issues.apache.org/jira/browse/HBASE-22513) | Admin#getQuota does not work correctly if exceedThrottleQuota is set | Major | Quotas |
| [HBASE-22522](https://issues.apache.org/jira/browse/HBASE-22522) | The integration test in master branch's nightly job has error "ERROR: Only found 1050 rows." | Major | . |
| [HBASE-22490](https://issues.apache.org/jira/browse/HBASE-22490) | Nightly client integration test fails with hadoop-3 | Major | build |
| [HBASE-22502](https://issues.apache.org/jira/browse/HBASE-22502) | Purge the logs when we reach the EOF for the last wal file when replication | Major | . |
| [HBASE-22503](https://issues.apache.org/jira/browse/HBASE-22503) | Failed to upgrade to 2.2+ as the global permission which storaged in zk is not right | Blocker | . |
| [HBASE-22487](https://issues.apache.org/jira/browse/HBASE-22487) | getMostLoadedRegions is unused | Trivial | regionserver |
| [HBASE-22485](https://issues.apache.org/jira/browse/HBASE-22485) | Fix failed ut TestClusterRestartFailover | Major | . |
| [HBASE-22486](https://issues.apache.org/jira/browse/HBASE-22486) | Fix flaky test TestLockManager | Major | . |
| [HBASE-22471](https://issues.apache.org/jira/browse/HBASE-22471) | Our nightly jobs for master and branch-2 are still using hadoop-2.7.1 in integration test | Major | build |
| [HBASE-22003](https://issues.apache.org/jira/browse/HBASE-22003) | Fix flaky test TestVerifyReplication.testHBase14905 | Major | . |
| [HBASE-22441](https://issues.apache.org/jira/browse/HBASE-22441) | BucketCache NullPointerException in cacheBlock | Major | BucketCache |
| [HBASE-22473](https://issues.apache.org/jira/browse/HBASE-22473) | Split TestSCP | Major | Recovery, test |
| [HBASE-22456](https://issues.apache.org/jira/browse/HBASE-22456) | Polish TestSplitTransitionOnCluster | Major | test |
| [HBASE-21800](https://issues.apache.org/jira/browse/HBASE-21800) | RegionServer aborted due to NPE from MetaTableMetrics coprocessor | Critical | Coprocessors, meta, metrics, Operability |
| [HBASE-22462](https://issues.apache.org/jira/browse/HBASE-22462) | Should run a 'mvn install' at the end of hadoop check in pre commit job | Major | build |
| [HBASE-22440](https://issues.apache.org/jira/browse/HBASE-22440) | HRegionServer#getWalGroupsReplicationStatus() throws NPE | Major | regionserver, Replication |
| [HBASE-22226](https://issues.apache.org/jira/browse/HBASE-22226) | Incorrect level for headings in asciidoc | Trivial | documentation |
| [HBASE-22442](https://issues.apache.org/jira/browse/HBASE-22442) | Nightly build is failing with hadoop 3.x | Major | build, hadoop3 |
| [HBASE-20970](https://issues.apache.org/jira/browse/HBASE-20970) | Update hadoop check versions for hadoop3 in hbase-personality | Major | build |
| [HBASE-22424](https://issues.apache.org/jira/browse/HBASE-22424) | Interactions in RSGroup test classes will cause TestRSGroupsAdmin2.testMoveServersAndTables and TestRSGroupsBalance.testGroupBalance flaky | Major | rsgroup |
| [HBASE-22404](https://issues.apache.org/jira/browse/HBASE-22404) | Open/Close region request may be executed twice when master restart | Major | . |
| [HBASE-22274](https://issues.apache.org/jira/browse/HBASE-22274) | Cell size limit check on append should consider cell's previous size. | Minor | . |
| [HBASE-22072](https://issues.apache.org/jira/browse/HBASE-22072) | High read/write intensive regions may cause long crash recovery | Major | Performance, Recovery |
| [HBASE-22324](https://issues.apache.org/jira/browse/HBASE-22324) | loss a mass of data when the sequenceId of cells greater than Integer.Max, because MemStoreMergerSegmentsIterator can not merge segments | Blocker | in-memory-compaction |
| [HBASE-21777](https://issues.apache.org/jira/browse/HBASE-21777) | "Tune compaction throughput" debug messages even when nothing has changed | Trivial | Compaction |
| [HBASE-22360](https://issues.apache.org/jira/browse/HBASE-22360) | Abort timer doesn't set when abort is called during graceful shutdown process | Major | regionserver |
| [HBASE-20851](https://issues.apache.org/jira/browse/HBASE-20851) | Change rubocop config for max line length of 100 | Minor | community, shell |
| [HBASE-21467](https://issues.apache.org/jira/browse/HBASE-21467) | Fix flaky test TestCoprocessorClassLoader.testCleanupOldJars | Minor | . |
| [HBASE-22312](https://issues.apache.org/jira/browse/HBASE-22312) | Hadoop 3 profile for hbase-shaded-mapreduce should like mapreduce as a provided dependency | Major | mapreduce, shading |
| [HBASE-22314](https://issues.apache.org/jira/browse/HBASE-22314) | shaded byo-hadoop client should list needed hadoop modules as provided scope to avoid inclusion of unnecessary transitive depednencies | Major | hadoop2, hadoop3, shading |
| [HBASE-22047](https://issues.apache.org/jira/browse/HBASE-22047) | LeaseException in Scan should be retired | Major | Client, Scanners |
| [HBASE-22343](https://issues.apache.org/jira/browse/HBASE-22343) | Make procedure retry interval configurable in test | Major | amv2, test |
| [HBASE-22190](https://issues.apache.org/jira/browse/HBASE-22190) | SnapshotFileCache may fail to load the correct snapshot file list when there is an on-going snapshot operation | Blocker | snapshots |
| [HBASE-22354](https://issues.apache.org/jira/browse/HBASE-22354) | master never sets abortRequested, and thus abort timeout doesn't work for it | Major | . |
| [HBASE-22350](https://issues.apache.org/jira/browse/HBASE-22350) | Rewrite TestClientOperationTimeout so we do not timeout when creating table | Major | test |
| [HBASE-22340](https://issues.apache.org/jira/browse/HBASE-22340) | Corrupt KeyValue is silently ignored | Critical | wal |
| [HBASE-22054](https://issues.apache.org/jira/browse/HBASE-22054) | Space Quota: Compaction is not working for super user in case of NO\_WRITES\_COMPACTIONS | Minor | . |
| [HBASE-22236](https://issues.apache.org/jira/browse/HBASE-22236) | AsyncNonMetaRegionLocator should not cache HRegionLocation with null location | Major | asyncclient |
| [HBASE-22086](https://issues.apache.org/jira/browse/HBASE-22086) | space quota issue: deleting snapshot doesn't update the usage of table | Minor | . |
| [HBASE-22298](https://issues.apache.org/jira/browse/HBASE-22298) | branch-2.2 nightly fails "[ForOverride] Method annotated @ForOverride must have protected or package-private visibility" | Major | . |
| [HBASE-22292](https://issues.apache.org/jira/browse/HBASE-22292) | PreemptiveFastFailInterceptor clean repeatedFailuresMap issue | Blocker | . |
| [HBASE-22230](https://issues.apache.org/jira/browse/HBASE-22230) | REST Server drops connection on long scans | Major | . |
| [HBASE-22200](https://issues.apache.org/jira/browse/HBASE-22200) | WALSplitter.hasRecoveredEdits should use same FS instance from WAL region dir | Major | wal |
| [HBASE-22286](https://issues.apache.org/jira/browse/HBASE-22286) | License handling incorrectly lists CDDL/GPLv2+CE as safe to not aggregate | Critical | build, community |
| [HBASE-22282](https://issues.apache.org/jira/browse/HBASE-22282) | Should deal with error in the callback of RawAsyncHBaseAdmin.splitRegion methods | Major | Admin, asyncclient |
| [HBASE-22278](https://issues.apache.org/jira/browse/HBASE-22278) | RawAsyncHBaseAdmin should not use cached region location | Major | Admin, asyncclient |
| [HBASE-22222](https://issues.apache.org/jira/browse/HBASE-22222) | Site build fails after hbase-thirdparty upgrade | Blocker | website |
| [HBASE-22249](https://issues.apache.org/jira/browse/HBASE-22249) | Rest Server throws NoClassDefFoundError with Java 11 (run-time) | Major | . |
| [HBASE-22235](https://issues.apache.org/jira/browse/HBASE-22235) | OperationStatus.{SUCCESS\|FAILURE\|NOT\_RUN} are not visible to 3rd party coprocessors | Major | Coprocessors |
| [HBASE-22207](https://issues.apache.org/jira/browse/HBASE-22207) | Fix flakey TestAssignmentManager.testAssignSocketTimeout | Major | test |
| [HBASE-22202](https://issues.apache.org/jira/browse/HBASE-22202) | Fix new findbugs issues after we upgrade hbase-thirdparty dependencies | Major | findbugs |
| [HBASE-22144](https://issues.apache.org/jira/browse/HBASE-22144) | MultiRowRangeFilter does not work with reversed scans | Critical | Filters, Scanners |
| [HBASE-22198](https://issues.apache.org/jira/browse/HBASE-22198) | Fix flakey TestAsyncTableGetMultiThreaded | Major | test |
| [HBASE-22185](https://issues.apache.org/jira/browse/HBASE-22185) | RAMQueueEntry#writeToCache should freeBlock if any exception encountered instead of the IOException catch block | Major | . |
| [HBASE-22163](https://issues.apache.org/jira/browse/HBASE-22163) | Should not archive the compacted store files when region warmup | Blocker | . |
| [HBASE-22178](https://issues.apache.org/jira/browse/HBASE-22178) | Introduce a createTableAsync with TableDescriptor method in Admin | Major | Admin |
| [HBASE-22180](https://issues.apache.org/jira/browse/HBASE-22180) | Make TestBlockEvictionFromClient.testBlockRefCountAfterSplits more stable | Major | test |
| [HBASE-22179](https://issues.apache.org/jira/browse/HBASE-22179) | Fix RawAsyncHBaseAdmin.getCompactionState | Major | Admin, asyncclient |
| [HBASE-22177](https://issues.apache.org/jira/browse/HBASE-22177) | Do not recreate IOException in RawAsyncHBaseAdmin.adminCall | Major | Admin, asyncclient |
| [HBASE-22070](https://issues.apache.org/jira/browse/HBASE-22070) | Checking restoreDir in RestoreSnapshotHelper | Minor | snapshots |
| [HBASE-20912](https://issues.apache.org/jira/browse/HBASE-20912) | Add import order config in dev support for eclipse | Major | . |
| [HBASE-22133](https://issues.apache.org/jira/browse/HBASE-22133) | Forward port HBASE-22073 "/rits.jsp throws an exception if no procedure" to branch-2.2+ | Major | UI |
| [HBASE-20911](https://issues.apache.org/jira/browse/HBASE-20911) | correct Swtich/case indentation in formatter template for eclipse | Major | . |
| [HBASE-21688](https://issues.apache.org/jira/browse/HBASE-21688) | Address WAL filesystem issues | Major | Filesystem Integration, wal |
| [HBASE-22121](https://issues.apache.org/jira/browse/HBASE-22121) | AsyncAdmin can not deal with non default meta replica | Major | Admin, asyncclient, Client |
| [HBASE-22115](https://issues.apache.org/jira/browse/HBASE-22115) | HBase RPC aspires to grow an infinite tree of trace scopes; some other places are also unsafe | Critical | . |
| [HBASE-22123](https://issues.apache.org/jira/browse/HBASE-22123) | REST gateway reports Insufficient permissions exceptions as 404 Not Found | Minor | REST |
| [HBASE-21135](https://issues.apache.org/jira/browse/HBASE-21135) | Build fails on windows as it fails to parse windows path during license check | Major | build |
| [HBASE-21781](https://issues.apache.org/jira/browse/HBASE-21781) | list\_deadservers elapsed time is incorrect | Major | shell |
| [HBASE-22100](https://issues.apache.org/jira/browse/HBASE-22100) | False positive for error prone warnings in pre commit job | Minor | build |
| [HBASE-22098](https://issues.apache.org/jira/browse/HBASE-22098) | Backport HBASE-18667 "Disable error-prone for hbase-protocol-shaded" to branch-2 | Major | build |
| [HBASE-20662](https://issues.apache.org/jira/browse/HBASE-20662) | Increasing space quota on a violated table does not remove SpaceViolationPolicy.DISABLE enforcement | Major | . |
| [HBASE-22057](https://issues.apache.org/jira/browse/HBASE-22057) | Impose upper-bound on size of ZK ops sent in a single multi() | Major | . |
| [HBASE-22074](https://issues.apache.org/jira/browse/HBASE-22074) | Should use procedure store to persist the state in reportRegionStateTransition | Blocker | amv2, proc-v2 |
| [HBASE-21619](https://issues.apache.org/jira/browse/HBASE-21619) | Fix warning message caused by incorrect ternary operator evaluation | Trivial | . |
| [HBASE-22095](https://issues.apache.org/jira/browse/HBASE-22095) | Taking a snapshot fails in local mode | Major | . |
| [HBASE-22061](https://issues.apache.org/jira/browse/HBASE-22061) | SplitTableRegionProcedure should hold the lock of its daughter regions | Major | . |
| [HBASE-22045](https://issues.apache.org/jira/browse/HBASE-22045) | Mutable range histogram reports incorrect outliers | Major | . |
| [HBASE-21736](https://issues.apache.org/jira/browse/HBASE-21736) | Remove the server from online servers before scheduling SCP for it in hbck | Major | hbck2, test |
| [HBASE-22011](https://issues.apache.org/jira/browse/HBASE-22011) | ThriftUtilities.getFromThrift should set filter when not set columns | Major | . |
| [HBASE-21990](https://issues.apache.org/jira/browse/HBASE-21990) | puppycrawl checkstyle dtds 404... moved to sourceforge | Major | build |
| [HBASE-22010](https://issues.apache.org/jira/browse/HBASE-22010) | docs on upgrade from 2.0,2.1 -\> 2.2 renders incorrectly | Minor | documentation |
| [HBASE-22006](https://issues.apache.org/jira/browse/HBASE-22006) | Fix branch-2.1 findbugs warning; causes nightly show as failed. | Major | . |
| [HBASE-21960](https://issues.apache.org/jira/browse/HBASE-21960) | RESTServletContainer not configured for REST Jetty server | Blocker | REST |
| [HBASE-21915](https://issues.apache.org/jira/browse/HBASE-21915) | FileLink$FileLinkInputStream doesn't implement CanUnbuffer | Major | Filesystem Integration |
| [HBASE-21565](https://issues.apache.org/jira/browse/HBASE-21565) | Delete dead server from dead server list too early leads to concurrent Server Crash Procedures(SCP) for a same server | Critical | . |
| [HBASE-21740](https://issues.apache.org/jira/browse/HBASE-21740) | NPE happens while shutdown the RS | Major | . |
| [HBASE-21866](https://issues.apache.org/jira/browse/HBASE-21866) | Do not move the table to null rsgroup when creating an existing table | Major | proc-v2, rsgroup |
| [HBASE-21983](https://issues.apache.org/jira/browse/HBASE-21983) | Should track the scan metrics in AsyncScanSingleRegionRpcRetryingCaller if scan metrics is enabled | Major | asyncclient, Client |
| [HBASE-21980](https://issues.apache.org/jira/browse/HBASE-21980) | Fix typo in AbstractTestAsyncTableRegionReplicasRead | Major | test |
| [HBASE-21487](https://issues.apache.org/jira/browse/HBASE-21487) | Concurrent modify table ops can lead to unexpected results | Major | . |
| [HBASE-20724](https://issues.apache.org/jira/browse/HBASE-20724) | Sometimes some compacted storefiles are still opened after region failover | Critical | . |
| [HBASE-21961](https://issues.apache.org/jira/browse/HBASE-21961) | Infinite loop in AsyncNonMetaRegionLocator if there is only one region and we tried to locate before a non empty row | Critical | asyncclient, Client |
| [HBASE-21943](https://issues.apache.org/jira/browse/HBASE-21943) | The usage of RegionLocations.mergeRegionLocations is wrong for async client | Critical | asyncclient, Client |
| [HBASE-21947](https://issues.apache.org/jira/browse/HBASE-21947) | TestShell is broken after we remove the jackson dependencies | Major | dependencies, shell |
| [HBASE-21942](https://issues.apache.org/jira/browse/HBASE-21942) | [UI] requests per second is incorrect in rsgroup page(rsgroup.jsp) | Minor | . |
| [HBASE-21922](https://issues.apache.org/jira/browse/HBASE-21922) | BloomContext#sanityCheck may failed when use ROWPREFIX\_DELIMITED bloom filter | Major | . |
| [HBASE-21929](https://issues.apache.org/jira/browse/HBASE-21929) | The checks at the end of TestRpcClientLeaks are not executed | Major | test |
| [HBASE-21938](https://issues.apache.org/jira/browse/HBASE-21938) | Add a new ClusterMetrics.Option SERVERS\_NAME to only return the live region servers's name without metrics | Major | . |
| [HBASE-21928](https://issues.apache.org/jira/browse/HBASE-21928) | Deprecated HConstants.META\_QOS | Major | Client, rpc |
| [HBASE-21899](https://issues.apache.org/jira/browse/HBASE-21899) | Fix missing variables in slf4j Logger | Trivial | logging |
| [HBASE-21910](https://issues.apache.org/jira/browse/HBASE-21910) | The nonce implementation is wrong for AsyncTable | Critical | asyncclient, Client |
| [HBASE-21900](https://issues.apache.org/jira/browse/HBASE-21900) | Infinite loop in AsyncMetaRegionLocator if we can not get the location for meta | Major | asyncclient, Client |
| [HBASE-21890](https://issues.apache.org/jira/browse/HBASE-21890) | Use execute instead of submit to submit a task in RemoteProcedureDispatcher | Critical | proc-v2 |
| [HBASE-21889](https://issues.apache.org/jira/browse/HBASE-21889) | Use thrift 0.12.0 when build thrift by compile-thrift profile | Major | . |
| [HBASE-21785](https://issues.apache.org/jira/browse/HBASE-21785) | master reports open regions as RITs and also messes up rit age metric | Major | . |
| [HBASE-21854](https://issues.apache.org/jira/browse/HBASE-21854) | Race condition in TestProcedureSkipPersistence | Minor | proc-v2 |
| [HBASE-21862](https://issues.apache.org/jira/browse/HBASE-21862) | IPCUtil.wrapException should keep the original exception types for all the connection exceptions | Blocker | . |
| [HBASE-18484](https://issues.apache.org/jira/browse/HBASE-18484) | VerifyRep by snapshot does not work when Yarn / SourceHBase / PeerHBase located in different HDFS clusters | Major | Replication |
| [HBASE-21775](https://issues.apache.org/jira/browse/HBASE-21775) | The BufferedMutator doesn't ever refresh region location cache | Major | Client |
| [HBASE-21843](https://issues.apache.org/jira/browse/HBASE-21843) | RegionGroupingProvider breaks the meta wal file name pattern which may cause data loss for meta region | Blocker | wal |
| [HBASE-21795](https://issues.apache.org/jira/browse/HBASE-21795) | Client application may get stuck (time bound) if a table modify op is called immediately after split op | Critical | amv2 |
| [HBASE-21840](https://issues.apache.org/jira/browse/HBASE-21840) | TestHRegionWithInMemoryFlush fails with NPE | Blocker | test |
| [HBASE-21811](https://issues.apache.org/jira/browse/HBASE-21811) | region can be opened on two servers due to race condition with procedures and server reports | Blocker | amv2 |
| [HBASE-21644](https://issues.apache.org/jira/browse/HBASE-21644) | Modify table procedure runs infinitely for a table having region replication \> 1 | Critical | Admin |
| [HBASE-21733](https://issues.apache.org/jira/browse/HBASE-21733) | SnapshotQuotaObserverChore should only fetch space quotas | Major | . |
| [HBASE-21699](https://issues.apache.org/jira/browse/HBASE-21699) | Create table failed when using SPLITS\_FILE =\> 'splits.txt' | Blocker | Client, shell |
| [HBASE-21535](https://issues.apache.org/jira/browse/HBASE-21535) | Zombie Master detector is not working | Critical | master |
| [HBASE-21770](https://issues.apache.org/jira/browse/HBASE-21770) | Should deal with meta table in HRegionLocator.getAllRegionLocations | Major | Client |
| [HBASE-21754](https://issues.apache.org/jira/browse/HBASE-21754) | ReportRegionStateTransitionRequest should be executed in priority executor | Major | . |
| [HBASE-21475](https://issues.apache.org/jira/browse/HBASE-21475) | Put mutation (having TTL set) added via co-processor is retrieved even after TTL expires | Major | Coprocessors |
| [HBASE-21749](https://issues.apache.org/jira/browse/HBASE-21749) | RS UI may throw NPE and make rs-status page inaccessible with multiwal and replication | Major | Replication, UI |
| [HBASE-21746](https://issues.apache.org/jira/browse/HBASE-21746) | Fix two concern cases in RegionMover | Major | . |
| [HBASE-21732](https://issues.apache.org/jira/browse/HBASE-21732) | Should call toUpperCase before using Enum.valueOf in some methods for ColumnFamilyDescriptor | Critical | Client |
| [HBASE-21704](https://issues.apache.org/jira/browse/HBASE-21704) | The implementation of DistributedHBaseCluster.getServerHoldingRegion is incorrect | Major | . |
| [HBASE-20917](https://issues.apache.org/jira/browse/HBASE-20917) | MetaTableMetrics#stop references uninitialized requestsMap for non-meta region | Major | meta, metrics |
| [HBASE-21639](https://issues.apache.org/jira/browse/HBASE-21639) | maxHeapUsage value not read properly from config during EntryBuffers initialization | Minor | . |
| [HBASE-21225](https://issues.apache.org/jira/browse/HBASE-21225) | Having RPC & Space quota on a table/Namespace doesn't allow space quota to be removed using 'NONE' | Major | . |
| [HBASE-21707](https://issues.apache.org/jira/browse/HBASE-21707) | Fix warnings in hbase-rsgroup module and also make the UTs more stable | Major | Region Assignment, rsgroup |
| [HBASE-20220](https://issues.apache.org/jira/browse/HBASE-20220) | [RSGroup] Check if table exists in the cluster before moving it to the specified regionserver group | Major | rsgroup |
| [HBASE-21691](https://issues.apache.org/jira/browse/HBASE-21691) | Fix flaky test TestRecoveredEdits | Major | . |
| [HBASE-21695](https://issues.apache.org/jira/browse/HBASE-21695) | Fix flaky test TestRegionServerAbortTimeout | Major | . |
| [HBASE-21614](https://issues.apache.org/jira/browse/HBASE-21614) | RIT recovery with ServerCrashProcedure doesn't account for all regions | Critical | amv2 |
| [HBASE-21618](https://issues.apache.org/jira/browse/HBASE-21618) | Scan with the same startRow(inclusive=true) and stopRow(inclusive=false) returns one result | Critical | Client |
| [HBASE-21683](https://issues.apache.org/jira/browse/HBASE-21683) | Reset readsEnabled flag after successfully flushing the primary region | Critical | read replicas |
| [HBASE-21630](https://issues.apache.org/jira/browse/HBASE-21630) | [shell] Define ENDKEY == STOPROW (we have ENDROW) | Trivial | shell |
| [HBASE-21547](https://issues.apache.org/jira/browse/HBASE-21547) | Precommit uses master flaky list for other branches | Major | test |
| [HBASE-21660](https://issues.apache.org/jira/browse/HBASE-21660) | Apply the cell to right memstore for increment/append operation | Major | . |
| [HBASE-21646](https://issues.apache.org/jira/browse/HBASE-21646) | Flakey TestTableSnapshotInputFormat; DisableTable not completing... | Major | test |
| [HBASE-21545](https://issues.apache.org/jira/browse/HBASE-21545) | NEW\_VERSION\_BEHAVIOR breaks Get/Scan with specified columns | Major | API |
| [HBASE-21629](https://issues.apache.org/jira/browse/HBASE-21629) | draining\_servers.rb is broken | Major | scripts |
| [HBASE-21621](https://issues.apache.org/jira/browse/HBASE-21621) | Reversed scan does not return expected number of rows | Critical | Scanners |
| [HBASE-21620](https://issues.apache.org/jira/browse/HBASE-21620) | Problem in scan query when using more than one column prefix filter in some cases. | Major | Scanners |
| [HBASE-21610](https://issues.apache.org/jira/browse/HBASE-21610) | numOpenConnections metric is set to -1 when zero server channel exist | Minor | metrics |
| [HBASE-21498](https://issues.apache.org/jira/browse/HBASE-21498) | Master OOM when SplitTableRegionProcedure new CacheConfig and instantiate a new BlockCache | Major | . |
| [HBASE-21592](https://issues.apache.org/jira/browse/HBASE-21592) | quota.addGetResult(r) throw NPE | Major | . |
| [HBASE-21589](https://issues.apache.org/jira/browse/HBASE-21589) | TestCleanupMetaWAL fails | Blocker | test, wal |
| [HBASE-21575](https://issues.apache.org/jira/browse/HBASE-21575) | memstore above high watermark message is logged too much | Minor | logging, regionserver |
| [HBASE-21582](https://issues.apache.org/jira/browse/HBASE-21582) | If call HBaseAdmin#snapshotAsync but forget call isSnapshotFinished, then SnapshotHFileCleaner will skip to run every time | Major | . |
| [HBASE-21568](https://issues.apache.org/jira/browse/HBASE-21568) | Disable use of BlockCache for LoadIncrementalHFiles | Major | Client |
| [HBASE-21453](https://issues.apache.org/jira/browse/HBASE-21453) | Convert ReadOnlyZKClient to DEBUG instead of INFO | Major | logging, Zookeeper |
| [HBASE-21559](https://issues.apache.org/jira/browse/HBASE-21559) | The RestoreSnapshotFromClientTestBase related UT are flaky | Major | . |
| [HBASE-21551](https://issues.apache.org/jira/browse/HBASE-21551) | Memory leak when use scan with STREAM at server side | Blocker | regionserver |
| [HBASE-21550](https://issues.apache.org/jira/browse/HBASE-21550) | Add a new method preCreateTableRegionInfos for MasterObserver which allows CPs to modify the TableDescriptor | Major | Coprocessors |
| [HBASE-21479](https://issues.apache.org/jira/browse/HBASE-21479) | Individual tests in TestHRegionReplayEvents class are failing | Major | . |
| [HBASE-21518](https://issues.apache.org/jira/browse/HBASE-21518) | TestMasterFailoverWithProcedures is flaky | Major | . |
| [HBASE-21504](https://issues.apache.org/jira/browse/HBASE-21504) | If enable FIFOCompactionPolicy, a compaction may write a "empty" hfile whose maxTimeStamp is long max. This kind of hfile will never be archived. | Critical | Compaction |
| [HBASE-21300](https://issues.apache.org/jira/browse/HBASE-21300) | Fix the wrong reference file path when restoring snapshots for tables with MOB columns | Major | . |
| [HBASE-21507](https://issues.apache.org/jira/browse/HBASE-21507) | Compaction failed when execute AbstractMultiFileWriter.beforeShipped() method | Major | Compaction, regionserver |
| [HBASE-21387](https://issues.apache.org/jira/browse/HBASE-21387) | Race condition surrounding in progress snapshot handling in snapshot cache leads to loss of snapshot files | Major | snapshots |
| [HBASE-21503](https://issues.apache.org/jira/browse/HBASE-21503) | Replication normal source can get stuck due potential race conditions between source wal reader and wal provider initialization threads. | Blocker | Replication |
| [HBASE-21466](https://issues.apache.org/jira/browse/HBASE-21466) | WALProcedureStore uses wrong FileSystem if wal.dir is not under rootdir | Major | . |
| [HBASE-21445](https://issues.apache.org/jira/browse/HBASE-21445) | CopyTable by bulkload will write hfile into yarn's HDFS | Major | mapreduce |
| [HBASE-21437](https://issues.apache.org/jira/browse/HBASE-21437) | Bypassed procedure throw IllegalArgumentException when its state is WAITING\_TIMEOUT | Major | . |
| [HBASE-21439](https://issues.apache.org/jira/browse/HBASE-21439) | StochasticLoadBalancer RegionLoads aren’t being used in RegionLoad cost functions | Major | Balancer |
| [HBASE-20604](https://issues.apache.org/jira/browse/HBASE-20604) | ProtobufLogReader#readNext can incorrectly loop to the same position in the stream until the the WAL is rolled | Critical | Replication, wal |
| [HBASE-21247](https://issues.apache.org/jira/browse/HBASE-21247) | Custom Meta WAL Provider doesn't default to custom WAL Provider whose configuration value is outside the enums in Providers | Major | wal |
| [HBASE-21430](https://issues.apache.org/jira/browse/HBASE-21430) | [hbase-connectors] Move hbase-spark\* modules to hbase-connectors repo | Major | hbase-connectors, spark |
| [HBASE-21438](https://issues.apache.org/jira/browse/HBASE-21438) | TestAdmin2#testGetProcedures fails due to FailedProcedure inaccessible | Major | . |
| [HBASE-21425](https://issues.apache.org/jira/browse/HBASE-21425) | 2.1.1 fails to start over 1.x data; namespace not assigned | Critical | amv2 |
| [HBASE-21407](https://issues.apache.org/jira/browse/HBASE-21407) | Resolve NPE in backup Master UI | Minor | UI |
| [HBASE-21422](https://issues.apache.org/jira/browse/HBASE-21422) | NPE in TestMergeTableRegionsProcedure.testMergeWithoutPONR | Major | proc-v2, test |
| [HBASE-21424](https://issues.apache.org/jira/browse/HBASE-21424) | Change flakies and nightlies so scheduled less often | Major | build |
| [HBASE-21417](https://issues.apache.org/jira/browse/HBASE-21417) | Pre commit build is broken due to surefire plugin crashes | Critical | build |
| [HBASE-21371](https://issues.apache.org/jira/browse/HBASE-21371) | Hbase unable to compile against Hadoop trunk (3.3.0-SNAPSHOT) due to license error | Major | . |
| [HBASE-21391](https://issues.apache.org/jira/browse/HBASE-21391) | RefreshPeerProcedure should also wait master initialized before executing | Major | Replication |
| [HBASE-21342](https://issues.apache.org/jira/browse/HBASE-21342) | FileSystem in use may get closed by other bulk load call in secure bulkLoad | Major | . |
| [HBASE-21349](https://issues.apache.org/jira/browse/HBASE-21349) | Cluster is going down but CatalogJanitor and Normalizer try to run and fail noisely | Minor | . |
| [HBASE-21356](https://issues.apache.org/jira/browse/HBASE-21356) | bulkLoadHFile API should ensure that rs has the source hfile's write permission | Major | . |
| [HBASE-21355](https://issues.apache.org/jira/browse/HBASE-21355) | HStore's storeSize is calculated repeatedly which causing the confusing region split | Blocker | regionserver |
| [HBASE-21334](https://issues.apache.org/jira/browse/HBASE-21334) | TestMergeTableRegionsProcedure is flakey | Major | amv2, proc-v2, test |
| [HBASE-21178](https://issues.apache.org/jira/browse/HBASE-21178) | [BC break] : Get and Scan operation with a custom converter\_class not working | Critical | shell |
| [HBASE-21200](https://issues.apache.org/jira/browse/HBASE-21200) | Memstore flush doesn't finish because of seekToPreviousRow() in memstore scanner. | Critical | Scanners |
| [HBASE-21292](https://issues.apache.org/jira/browse/HBASE-21292) | IdLock.getLockEntry() may hang if interrupted | Major | . |
| [HBASE-21335](https://issues.apache.org/jira/browse/HBASE-21335) | Change the default wait time of HBCK2 tool | Critical | . |
| [HBASE-21291](https://issues.apache.org/jira/browse/HBASE-21291) | Add a test for bypassing stuck state-machine procedures | Major | . |
| [HBASE-21055](https://issues.apache.org/jira/browse/HBASE-21055) | NullPointerException when balanceOverall() but server balance info is null | Major | Balancer |
| [HBASE-21327](https://issues.apache.org/jira/browse/HBASE-21327) | Fix minor logging issue where we don't report servername if no associated SCP | Trivial | amv2 |
| [HBASE-21320](https://issues.apache.org/jira/browse/HBASE-21320) | [canary] Cleanup of usage and add commentary | Major | canary |
| [HBASE-21266](https://issues.apache.org/jira/browse/HBASE-21266) | Not running balancer because processing dead regionservers, but empty dead rs list | Major | . |
| [HBASE-21260](https://issues.apache.org/jira/browse/HBASE-21260) | The whole balancer plans might be aborted if there are more than one plans to move a same region | Major | Balancer, master |
| [HBASE-21280](https://issues.apache.org/jira/browse/HBASE-21280) | Add anchors for each heading in UI | Trivial | UI, Usability |
| [HBASE-20764](https://issues.apache.org/jira/browse/HBASE-20764) | build broken when latest commit is gpg signed | Critical | build |
| [HBASE-18549](https://issues.apache.org/jira/browse/HBASE-18549) | Unclaimed replication queues can go undetected | Critical | Replication |
| [HBASE-21248](https://issues.apache.org/jira/browse/HBASE-21248) | Implement exponential backoff when retrying for ModifyPeerProcedure | Major | proc-v2, Replication |
| [HBASE-21196](https://issues.apache.org/jira/browse/HBASE-21196) | HTableMultiplexer clears the meta cache after every put operation | Critical | Performance |
| [HBASE-19418](https://issues.apache.org/jira/browse/HBASE-19418) | RANGE\_OF\_DELAY in PeriodicMemstoreFlusher should be configurable. | Minor | . |
| [HBASE-18451](https://issues.apache.org/jira/browse/HBASE-18451) | PeriodicMemstoreFlusher should inspect the queue before adding a delayed flush request | Major | regionserver |
| [HBASE-21228](https://issues.apache.org/jira/browse/HBASE-21228) | Memory leak since AbstractFSWAL caches Thread object and never clean later | Critical | wal |
| [HBASE-20766](https://issues.apache.org/jira/browse/HBASE-20766) | Verify Replication Tool Has Typo "remove cluster" | Trivial | . |
| [HBASE-21232](https://issues.apache.org/jira/browse/HBASE-21232) | Show table state in Tables view on Master home page | Major | Operability, UI |
| [HBASE-21212](https://issues.apache.org/jira/browse/HBASE-21212) | Wrong flush time when update flush metric | Minor | . |
| [HBASE-21208](https://issues.apache.org/jira/browse/HBASE-21208) | Bytes#toShort doesn't work without unsafe | Critical | . |
| [HBASE-20704](https://issues.apache.org/jira/browse/HBASE-20704) | Sometimes some compacted storefiles are not archived on region close | Critical | Compaction |
| [HBASE-21203](https://issues.apache.org/jira/browse/HBASE-21203) | TestZKMainServer#testCommandLineWorks won't pass with default 4lw whitelist | Minor | test, Zookeeper |
| [HBASE-21102](https://issues.apache.org/jira/browse/HBASE-21102) | ServerCrashProcedure should select target server where no other replicas exist for the current region | Major | Region Assignment |
| [HBASE-21206](https://issues.apache.org/jira/browse/HBASE-21206) | Scan with batch size may return incomplete cells | Critical | Scanners |
| [HBASE-21182](https://issues.apache.org/jira/browse/HBASE-21182) | Failed to execute start-hbase.sh | Major | . |
| [HBASE-21179](https://issues.apache.org/jira/browse/HBASE-21179) | Fix the number of actions in responseTooSlow log | Major | logging, rpc |
| [HBASE-21174](https://issues.apache.org/jira/browse/HBASE-21174) | [REST] Failed to parse empty qualifier in TableResource#getScanResource | Major | REST |
| [HBASE-21181](https://issues.apache.org/jira/browse/HBASE-21181) | Use the same filesystem for wal archive directory and wal directory | Major | . |
| [HBASE-21021](https://issues.apache.org/jira/browse/HBASE-21021) | Result returned by Append operation should be ordered | Major | . |
| [HBASE-21173](https://issues.apache.org/jira/browse/HBASE-21173) | Remove the duplicate HRegion#close in TestHRegion | Minor | test |
| [HBASE-21144](https://issues.apache.org/jira/browse/HBASE-21144) | AssignmentManager.waitForAssignment is not stable | Major | amv2, test |
| [HBASE-21143](https://issues.apache.org/jira/browse/HBASE-21143) | Update findbugs-maven-plugin to 3.0.4 | Major | pom |
| [HBASE-21171](https://issues.apache.org/jira/browse/HBASE-21171) | [amv2] Tool to parse a directory of MasterProcWALs standalone | Major | amv2, test |
| [HBASE-21052](https://issues.apache.org/jira/browse/HBASE-21052) | After restoring a snapshot, table.jsp page for the table gets stuck | Major | snapshots |
| [HBASE-21001](https://issues.apache.org/jira/browse/HBASE-21001) | ReplicationObserver fails to load in HBase 2.0.0 | Major | . |
| [HBASE-20741](https://issues.apache.org/jira/browse/HBASE-20741) | Split of a region with replicas creates all daughter regions and its replica in same server | Major | read replicas |
| [HBASE-21127](https://issues.apache.org/jira/browse/HBASE-21127) | TableRecordReader need to handle cursor result too | Major | . |
| [HBASE-20892](https://issues.apache.org/jira/browse/HBASE-20892) | [UI] Start / End keys are empty on table.jsp | Major | . |
| [HBASE-21136](https://issues.apache.org/jira/browse/HBASE-21136) | NPE in MetricsTableSourceImpl.updateFlushTime | Major | metrics |
| [HBASE-21132](https://issues.apache.org/jira/browse/HBASE-21132) | return wrong result in rest multiget | Major | . |
| [HBASE-21128](https://issues.apache.org/jira/browse/HBASE-21128) | TestAsyncRegionAdminApi.testAssignRegionAndUnassignRegion is broken | Major | test |
| [HBASE-20940](https://issues.apache.org/jira/browse/HBASE-20940) | HStore.cansplit should not allow split to happen if it has references | Major | . |
| [HBASE-21084](https://issues.apache.org/jira/browse/HBASE-21084) | When cloning a snapshot including a split parent region, the split parent region of the cloned table will be online | Major | snapshots |
| [HBASE-20968](https://issues.apache.org/jira/browse/HBASE-20968) | list\_procedures\_test fails due to no matching regex | Major | shell, test |
| [HBASE-21030](https://issues.apache.org/jira/browse/HBASE-21030) | Correct javadoc for append operation | Minor | documentation |
| [HBASE-21088](https://issues.apache.org/jira/browse/HBASE-21088) | HStoreFile should be closed in HStore#hasReferences | Major | . |
| [HBASE-20890](https://issues.apache.org/jira/browse/HBASE-20890) | PE filterScan seems to be stuck forever | Minor | . |
| [HBASE-20772](https://issues.apache.org/jira/browse/HBASE-20772) | Controlled shutdown fills Master log with the disturbing message "No matching procedure found for rit=OPEN, location=ZZZZ, table=YYYYY, region=XXXX transition to CLOSED | Major | logging |
| [HBASE-20978](https://issues.apache.org/jira/browse/HBASE-20978) | [amv2] Worker terminating UNNATURALLY during MoveRegionProcedure | Critical | amv2 |
| [HBASE-21078](https://issues.apache.org/jira/browse/HBASE-21078) | [amv2] CODE-BUG NPE in RTP doing Unassign | Major | amv2 |
| [HBASE-21113](https://issues.apache.org/jira/browse/HBASE-21113) | Apply the branch-2 version of HBASE-21095, The timeout retry logic for several procedures are broken after master restarts | Major | amv2 |
| [HBASE-21101](https://issues.apache.org/jira/browse/HBASE-21101) | Remove the waitUntilAllRegionsAssigned call after split in TestTruncateTableProcedure | Major | test |
| [HBASE-19008](https://issues.apache.org/jira/browse/HBASE-19008) | Add missing equals or hashCode method(s) to stock Filter implementations | Major | . |
| [HBASE-20614](https://issues.apache.org/jira/browse/HBASE-20614) | REST scan API with incorrect filter text file throws HTTP 503 Service Unavailable error | Minor | REST |
| [HBASE-21041](https://issues.apache.org/jira/browse/HBASE-21041) | Memstore's heap size will be decreased to minus zero after flush | Major | . |
| [HBASE-21031](https://issues.apache.org/jira/browse/HBASE-21031) | Memory leak if replay edits failed during region opening | Major | . |
| [HBASE-20666](https://issues.apache.org/jira/browse/HBASE-20666) | Unsuccessful table creation leaves entry in hbase:rsgroup table | Minor | . |
| [HBASE-21032](https://issues.apache.org/jira/browse/HBASE-21032) | ScanResponses contain only one cell each | Major | Performance, Scanners |
| [HBASE-20705](https://issues.apache.org/jira/browse/HBASE-20705) | Having RPC Quota on a table prevents Space quota to be recreated/removed | Major | . |
| [HBASE-21058](https://issues.apache.org/jira/browse/HBASE-21058) | Nightly tests for branches 1 fail to build ref guide | Major | documentation |
| [HBASE-21074](https://issues.apache.org/jira/browse/HBASE-21074) | JDK7 branches need to pass "-Dhttps.protocols=TLSv1.2" to maven when building | Major | build, community, test |
| [HBASE-21062](https://issues.apache.org/jira/browse/HBASE-21062) | WALFactory has misleading notion of "default" | Major | wal |
| [HBASE-21047](https://issues.apache.org/jira/browse/HBASE-21047) | Object creation of StoreFileScanner thru constructor and close may leave refCount to -1 | Major | . |
| [HBASE-21005](https://issues.apache.org/jira/browse/HBASE-21005) | Maven site configuration causes downstream projects to get a directory named ${project.basedir} | Minor | build |
| [HBASE-21007](https://issues.apache.org/jira/browse/HBASE-21007) | Memory leak in HBase rest server | Critical | REST |
| [HBASE-20794](https://issues.apache.org/jira/browse/HBASE-20794) | CreateTable operation does not log its landing at the master nor the initiator at INFO level | Major | logging |
| [HBASE-20538](https://issues.apache.org/jira/browse/HBASE-20538) | Upgrade our hadoop versions to 2.7.7 and 3.0.3 | Critical | java, security |
| [HBASE-20927](https://issues.apache.org/jira/browse/HBASE-20927) | RSGroupAdminEndpoint doesn't handle clearing dead servers if they are not processed yet. | Major | . |
| [HBASE-20932](https://issues.apache.org/jira/browse/HBASE-20932) | Effective MemStoreSize::hashCode() | Major | . |
| [HBASE-20928](https://issues.apache.org/jira/browse/HBASE-20928) | Rewrite calculation of midpoint in binarySearch functions to prevent overflow | Minor | io |
| [HBASE-20565](https://issues.apache.org/jira/browse/HBASE-20565) | ColumnRangeFilter combined with ColumnPaginationFilter can produce incorrect result since 1.4 | Major | Filters |
| [HBASE-20908](https://issues.apache.org/jira/browse/HBASE-20908) | Infinite loop on regionserver if region replica are reduced | Major | read replicas |
| [HBASE-19893](https://issues.apache.org/jira/browse/HBASE-19893) | restore\_snapshot is broken in master branch when region splits | Critical | snapshots |
| [HBASE-20870](https://issues.apache.org/jira/browse/HBASE-20870) | Wrong HBase root dir in ITBLL's Search Tool | Minor | integration tests |
| [HBASE-20901](https://issues.apache.org/jira/browse/HBASE-20901) | Reducing region replica has no effect | Major | . |
| [HBASE-6028](https://issues.apache.org/jira/browse/HBASE-6028) | Implement a cancel for in-progress compactions | Minor | regionserver |
| [HBASE-20869](https://issues.apache.org/jira/browse/HBASE-20869) | Endpoint-based Export use incorrect user to write to destination | Major | Coprocessors |
| [HBASE-20879](https://issues.apache.org/jira/browse/HBASE-20879) | Compacting memstore config should handle lower case | Major | . |
| [HBASE-20865](https://issues.apache.org/jira/browse/HBASE-20865) | CreateTableProcedure is stuck in retry loop in CREATE\_TABLE\_WRITE\_FS\_LAYOUT state | Major | amv2 |
| [HBASE-19572](https://issues.apache.org/jira/browse/HBASE-19572) | RegionMover should use the configured default port number and not the one from HConstants | Major | . |
| [HBASE-20697](https://issues.apache.org/jira/browse/HBASE-20697) | Can't cache All region locations of the specify table by calling table.getRegionLocator().getAllRegionLocations() | Major | meta |
| [HBASE-20791](https://issues.apache.org/jira/browse/HBASE-20791) | RSGroupBasedLoadBalancer#setClusterMetrics should pass ClusterMetrics to its internalBalancer | Major | Balancer, rsgroup |
| [HBASE-20770](https://issues.apache.org/jira/browse/HBASE-20770) | WAL cleaner logs way too much; gets clogged when lots of work to do | Critical | logging |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21963](https://issues.apache.org/jira/browse/HBASE-21963) | Add a script for building and verifying release candidate | Minor | community, scripts |
| [HBASE-21756](https://issues.apache.org/jira/browse/HBASE-21756) | Backport HBASE-21279 (Split TestAdminShell into several tests) to branch-2 | Major | . |
| [HBASE-20136](https://issues.apache.org/jira/browse/HBASE-20136) | TestKeyValue misses ClassRule and Category annotations | Minor | . |
| [HBASE-21261](https://issues.apache.org/jira/browse/HBASE-21261) | Add log4j.properties for hbase-rsgroup tests | Trivial | . |
| [HBASE-21258](https://issues.apache.org/jira/browse/HBASE-21258) | Add resetting of flags for RS Group pre/post hooks in TestRSGroups | Major | . |
| [HBASE-21097](https://issues.apache.org/jira/browse/HBASE-21097) | Flush pressure assertion may fail in testFlushThroughputTuning | Major | regionserver |
| [HBASE-21138](https://issues.apache.org/jira/browse/HBASE-21138) | Close HRegion instance at the end of every test in TestHRegion | Major | . |
| [HBASE-21161](https://issues.apache.org/jira/browse/HBASE-21161) | Enable the test added in HBASE-20741 that was removed accidentally | Minor | . |
| [HBASE-21076](https://issues.apache.org/jira/browse/HBASE-21076) | TestTableResource fails with NPE | Major | REST, test |
| [HBASE-20907](https://issues.apache.org/jira/browse/HBASE-20907) | Fix Intermittent failure on TestProcedurePriority | Major | . |
| [HBASE-20838](https://issues.apache.org/jira/browse/HBASE-20838) | Include hbase-server in precommit test if CommonFSUtils is changed | Major | . |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21970](https://issues.apache.org/jira/browse/HBASE-21970) | Document that how to upgrade from 2.0 or 2.1 to 2.2+ | Major | . |
| [HBASE-22357](https://issues.apache.org/jira/browse/HBASE-22357) | Fix remaining Checkstyle issues in hbase-replication | Trivial | Replication |
| [HBASE-22554](https://issues.apache.org/jira/browse/HBASE-22554) | Upgrade to surefire 2.22.2 | Major | test |
| [HBASE-22500](https://issues.apache.org/jira/browse/HBASE-22500) | Modify pom and jenkins jobs for hadoop versions | Blocker | build, hadoop2, hadoop3 |
| [HBASE-22316](https://issues.apache.org/jira/browse/HBASE-22316) | Record the stack trace for current thread in FutureUtils.get | Major | asyncclient, Client |
| [HBASE-22326](https://issues.apache.org/jira/browse/HBASE-22326) | Fix Checkstyle errors in hbase-examples | Minor | . |
| [HBASE-22327](https://issues.apache.org/jira/browse/HBASE-22327) | Fix remaining Checkstyle issues in hbase-hadoop-compat | Trivial | . |
| [HBASE-22478](https://issues.apache.org/jira/browse/HBASE-22478) | Add jackson dependency for hbase-http module | Major | build, dependencies |
| [HBASE-22445](https://issues.apache.org/jira/browse/HBASE-22445) | Add file info when throw exceptions in HFileReaderImpl | Major | . |
| [HBASE-22447](https://issues.apache.org/jira/browse/HBASE-22447) | Check refCount before free block in BucketCache | Major | BucketCache |
| [HBASE-22400](https://issues.apache.org/jira/browse/HBASE-22400) | Remove the adapter code in async fs implementation for hadoop-2.7.x | Major | wal |
| [HBASE-22430](https://issues.apache.org/jira/browse/HBASE-22430) | hbase-vote should tee build and test output to console | Trivial | . |
| [HBASE-22429](https://issues.apache.org/jira/browse/HBASE-22429) | hbase-vote download step requires URL to end with '/' | Trivial | . |
| [HBASE-22405](https://issues.apache.org/jira/browse/HBASE-22405) | Update Ref Guide for EOL of Hadoop 2.7 | Major | community, documentation |
| [HBASE-22325](https://issues.apache.org/jira/browse/HBASE-22325) | AsyncRpcRetryingCaller will not schedule retry if we hit a NotServingRegionException but there is no TableName provided | Major | asyncclient, Client |
| [HBASE-22322](https://issues.apache.org/jira/browse/HBASE-22322) | Use special pause for CallQueueTooBigException | Major | asyncclient, Client |
| [HBASE-22317](https://issues.apache.org/jira/browse/HBASE-22317) | Support reading from meta replicas | Major | asyncclient, read replicas |
| [HBASE-22261](https://issues.apache.org/jira/browse/HBASE-22261) | Make use of ClusterStatusListener for async client | Major | asyncclient |
| [HBASE-22267](https://issues.apache.org/jira/browse/HBASE-22267) | Implement client push back for async client | Major | asyncclient |
| [HBASE-19763](https://issues.apache.org/jira/browse/HBASE-19763) | Fix Checkstyle errors in hbase-procedure | Minor | . |
| [HBASE-22244](https://issues.apache.org/jira/browse/HBASE-22244) | Make use of MetricsConnection in async client | Major | asyncclient, metrics |
| [HBASE-22196](https://issues.apache.org/jira/browse/HBASE-22196) | Split TestRestartCluster | Major | test |
| [HBASE-22117](https://issues.apache.org/jira/browse/HBASE-22117) | Move hasPermission/checkPermissions from region server to master | Major | . |
| [HBASE-21886](https://issues.apache.org/jira/browse/HBASE-21886) | Run ITBLL for branch-2.2 | Major | . |
| [HBASE-22155](https://issues.apache.org/jira/browse/HBASE-22155) | Move 2.2.0 on to hbase-thirdparty-2.2.0 | Major | thirdparty |
| [HBASE-22153](https://issues.apache.org/jira/browse/HBASE-22153) | Fix the flaky TestRestartCluster | Major | test |
| [HBASE-22152](https://issues.apache.org/jira/browse/HBASE-22152) | Create a jenkins file for yetus to processing GitHub PR | Major | build |
| [HBASE-22158](https://issues.apache.org/jira/browse/HBASE-22158) | RawAsyncHBaseAdmin.getTableSplits should filter out none default replicas | Major | Admin |
| [HBASE-22157](https://issues.apache.org/jira/browse/HBASE-22157) | Include the cause when constructing RestoreSnapshotException in restoreSnapshot | Major | Admin |
| [HBASE-22141](https://issues.apache.org/jira/browse/HBASE-22141) | Fix TestAsyncDecommissionAdminApi | Major | test |
| [HBASE-22135](https://issues.apache.org/jira/browse/HBASE-22135) | AsyncAdmin will not refresh master address | Major | Admin, asyncclient, Client |
| [HBASE-22101](https://issues.apache.org/jira/browse/HBASE-22101) | AsyncAdmin.isTableAvailable should not throw TableNotFoundException | Major | Admin, asyncclient, Client |
| [HBASE-22094](https://issues.apache.org/jira/browse/HBASE-22094) | Throw TableNotFoundException if table not exists in AsyncAdmin.compact | Major | Admin |
| [HBASE-21911](https://issues.apache.org/jira/browse/HBASE-21911) | Move getUserPermissions from regionserver to master | Major | . |
| [HBASE-22015](https://issues.apache.org/jira/browse/HBASE-22015) | UserPermission should be annotated as InterfaceAudience.Public | Blocker | . |
| [HBASE-22066](https://issues.apache.org/jira/browse/HBASE-22066) | Add markers to CHANGES.md and RELEASENOTES.md | Major | . |
| [HBASE-22040](https://issues.apache.org/jira/browse/HBASE-22040) | Add mergeRegionsAsync with a List of region names method in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22039](https://issues.apache.org/jira/browse/HBASE-22039) | Should add the synchronous parameter for the XXXSwitch method in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22022](https://issues.apache.org/jira/browse/HBASE-22022) | nightly fails rat check down in the dev-support/hbase\_nightly\_source-artifact.sh check | Major | . |
| [HBASE-22025](https://issues.apache.org/jira/browse/HBASE-22025) | RAT check fails in nightlies; fails on (old) test data files. | Major | . |
| [HBASE-21977](https://issues.apache.org/jira/browse/HBASE-21977) | Skip replay WAL and update seqid when open regions restored from snapshot | Major | Region Assignment, snapshots |
| [HBASE-21999](https://issues.apache.org/jira/browse/HBASE-21999) | [DEBUG] Exit if git returns empty revision! | Major | build |
| [HBASE-22000](https://issues.apache.org/jira/browse/HBASE-22000) | Deprecated isTableAvailable with splitKeys | Major | asyncclient, Client |
| [HBASE-21949](https://issues.apache.org/jira/browse/HBASE-21949) | Fix flaky test TestHBaseTestingUtility.testMiniZooKeeperWithMultipleClientPorts | Major | . |
| [HBASE-21993](https://issues.apache.org/jira/browse/HBASE-21993) | Set version as 2.2.0 in branch-2.2 in prep for first RC | Major | . |
| [HBASE-21997](https://issues.apache.org/jira/browse/HBASE-21997) | Fix hbase-rest findbugs ST\_WRITE\_TO\_STATIC\_FROM\_INSTANCE\_METHOD complaint | Major | REST |
| [HBASE-21986](https://issues.apache.org/jira/browse/HBASE-21986) | Generate CHANGES.md and RELEASENOTES.md for 2.2.0 | Major | . |
| [HBASE-21972](https://issues.apache.org/jira/browse/HBASE-21972) | Copy master doc into branch-2.2 and edit to make it suit 2.2.0 | Major | . |
| [HBASE-15728](https://issues.apache.org/jira/browse/HBASE-15728) | Add remaining per-table region / store / flush / compaction related metrics | Major | metrics |
| [HBASE-21934](https://issues.apache.org/jira/browse/HBASE-21934) | RemoteProcedureDispatcher should track the ongoing dispatched calls | Blocker | proc-v2 |
| [HBASE-21588](https://issues.apache.org/jira/browse/HBASE-21588) | Procedure v2 wal splitting implementation | Major | . |
| [HBASE-21729](https://issues.apache.org/jira/browse/HBASE-21729) | Extract ProcedureCoordinatorRpcs and ProcedureMemberRpcs from CoordinatedStateManager | Major | . |
| [HBASE-21094](https://issues.apache.org/jira/browse/HBASE-21094) | Remove the explicit timeout config for TestTruncateTableProcedure | Major | test |
| [HBASE-21093](https://issues.apache.org/jira/browse/HBASE-21093) | Move TestCreateTableProcedure.testMRegions to a separated file | Major | test |
| [HBASE-18201](https://issues.apache.org/jira/browse/HBASE-18201) | add UT and docs for DataBlockEncodingTool | Minor | tooling |
| [HBASE-21978](https://issues.apache.org/jira/browse/HBASE-21978) | Should close AsyncRegistry if we fail to get cluster id when creating AsyncConnection | Major | asyncclient, Client |
| [HBASE-21974](https://issues.apache.org/jira/browse/HBASE-21974) | Change Admin#grant/revoke parameter from UserPermission to user and Permission | Major | . |
| [HBASE-21976](https://issues.apache.org/jira/browse/HBASE-21976) | Deal with RetryImmediatelyException for batching request | Major | asyncclient, Client |
| [HBASE-21820](https://issues.apache.org/jira/browse/HBASE-21820) | Implement CLUSTER quota scope | Major | . |
| [HBASE-21962](https://issues.apache.org/jira/browse/HBASE-21962) | Filters do not work in ThriftTable | Major | Thrift |
| [HBASE-21927](https://issues.apache.org/jira/browse/HBASE-21927) | Always fail the locate request when error occur | Major | asyncclient, Client |
| [HBASE-21944](https://issues.apache.org/jira/browse/HBASE-21944) | Validate put for batch operation | Major | asyncclient, Client |
| [HBASE-21945](https://issues.apache.org/jira/browse/HBASE-21945) | Maintain the original order when sending batch request | Major | asyncclient, Client |
| [HBASE-21783](https://issues.apache.org/jira/browse/HBASE-21783) | Support exceed user/table/ns throttle quota if region server has available quota | Major | . |
| [HBASE-21930](https://issues.apache.org/jira/browse/HBASE-21930) | Deal with ScannerResetException when opening region scanner | Major | asyncclient, Client |
| [HBASE-21907](https://issues.apache.org/jira/browse/HBASE-21907) | Should set priority for rpc request | Major | asyncclient, Client |
| [HBASE-21909](https://issues.apache.org/jira/browse/HBASE-21909) | Validate the put instance before executing in AsyncTable.put method | Major | asyncclient, Client |
| [HBASE-21814](https://issues.apache.org/jira/browse/HBASE-21814) | Remove the TODO in AccessControlLists#addUserPermission | Major | . |
| [HBASE-19889](https://issues.apache.org/jira/browse/HBASE-19889) | Revert Workaround: Purge User API building from branch-2 so can make a beta-1 | Major | website |
| [HBASE-21838](https://issues.apache.org/jira/browse/HBASE-21838) | Create a special ReplicationEndpoint just for verifying the WAL entries are fine | Major | Replication, wal |
| [HBASE-21829](https://issues.apache.org/jira/browse/HBASE-21829) | Use FutureUtils.addListener instead of calling whenComplete directly | Major | asyncclient, Client |
| [HBASE-21828](https://issues.apache.org/jira/browse/HBASE-21828) | Make sure we do not return CompletionException when locating region | Major | asyncclient, Client |
| [HBASE-21764](https://issues.apache.org/jira/browse/HBASE-21764) | Size of in-memory compaction thread pool should be configurable | Major | Compaction, in-memory-compaction |
| [HBASE-21809](https://issues.apache.org/jira/browse/HBASE-21809) | Add retry thrift client for ThriftTable/Admin | Major | . |
| [HBASE-21739](https://issues.apache.org/jira/browse/HBASE-21739) | Move grant/revoke from regionserver to master | Major | . |
| [HBASE-21798](https://issues.apache.org/jira/browse/HBASE-21798) | Cut branch-2.2 | Major | . |
| [HBASE-20542](https://issues.apache.org/jira/browse/HBASE-20542) | Better heap utilization for IMC with MSLABs | Major | in-memory-compaction |
| [HBASE-21713](https://issues.apache.org/jira/browse/HBASE-21713) | Support set region server throttle quota | Major | . |
| [HBASE-21761](https://issues.apache.org/jira/browse/HBASE-21761) | Align the methods in RegionLocator and AsyncTableRegionLocator | Major | asyncclient, Client |
| [HBASE-17370](https://issues.apache.org/jira/browse/HBASE-17370) | Fix or provide shell scripts to drain and decommission region server | Major | . |
| [HBASE-21750](https://issues.apache.org/jira/browse/HBASE-21750) | Most of KeyValueUtil#length can be replaced by cell#getSerializedSize for better performance because the latter one has been optimized | Major | . |
| [HBASE-21734](https://issues.apache.org/jira/browse/HBASE-21734) | Some optimization in FilterListWithOR | Major | . |
| [HBASE-21738](https://issues.apache.org/jira/browse/HBASE-21738) | Remove all the CSLM#size operation in our memstore because it's an quite time consuming. | Critical | Performance |
| [HBASE-21034](https://issues.apache.org/jira/browse/HBASE-21034) | Add new throttle type: read/write capacity unit | Major | . |
| [HBASE-21726](https://issues.apache.org/jira/browse/HBASE-21726) | Add getAllRegionLocations method to AsyncTableRegionLocator | Major | asyncclient, Client |
| [HBASE-19695](https://issues.apache.org/jira/browse/HBASE-19695) | Handle disabled table for async client | Major | asyncclient, Client |
| [HBASE-21711](https://issues.apache.org/jira/browse/HBASE-21711) | Remove references to git.apache.org/hbase.git | Critical | . |
| [HBASE-21647](https://issues.apache.org/jira/browse/HBASE-21647) | Add status track for splitting WAL tasks | Major | Operability |
| [HBASE-21705](https://issues.apache.org/jira/browse/HBASE-21705) | Should treat meta table specially for some methods in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-21663](https://issues.apache.org/jira/browse/HBASE-21663) | Add replica scan support | Major | asyncclient, Client, read replicas |
| [HBASE-21580](https://issues.apache.org/jira/browse/HBASE-21580) | Support getting Hbck instance from AsyncConnection | Major | asyncclient, Client, hbck2 |
| [HBASE-21652](https://issues.apache.org/jira/browse/HBASE-21652) | Refactor ThriftServer making thrift2 server inherited from thrift1 server | Major | . |
| [HBASE-21661](https://issues.apache.org/jira/browse/HBASE-21661) | Provide Thrift2 implementation of Table/Admin | Major | . |
| [HBASE-21682](https://issues.apache.org/jira/browse/HBASE-21682) | Support getting from specific replica | Major | read replicas |
| [HBASE-21159](https://issues.apache.org/jira/browse/HBASE-21159) | Add shell command to switch throttle on or off | Major | . |
| [HBASE-21362](https://issues.apache.org/jira/browse/HBASE-21362) | Disable printing of stack-trace in shell when quotas are violated | Minor | shell |
| [HBASE-21361](https://issues.apache.org/jira/browse/HBASE-21361) | Disable printing of stack-trace in shell when quotas are not enabled | Minor | shell |
| [HBASE-17356](https://issues.apache.org/jira/browse/HBASE-17356) | Add replica get support | Major | Client |
| [HBASE-21650](https://issues.apache.org/jira/browse/HBASE-21650) | Add DDL operation and some other miscellaneous to thrift2 | Major | Thrift |
| [HBASE-21401](https://issues.apache.org/jira/browse/HBASE-21401) | Sanity check when constructing the KeyValue | Critical | regionserver |
| [HBASE-21578](https://issues.apache.org/jira/browse/HBASE-21578) | Fix wrong throttling exception for capacity unit | Major | . |
| [HBASE-21570](https://issues.apache.org/jira/browse/HBASE-21570) | Add write buffer periodic flush support for AsyncBufferedMutator | Major | asyncclient, Client |
| [HBASE-21465](https://issues.apache.org/jira/browse/HBASE-21465) | Retry on reportRegionStateTransition can lead to unexpected errors | Major | amv2 |
| [HBASE-21508](https://issues.apache.org/jira/browse/HBASE-21508) | Ignore the reportRegionStateTransition call from a dead server | Major | amv2 |
| [HBASE-21490](https://issues.apache.org/jira/browse/HBASE-21490) | WALProcedure may remove proc wal files still with active procedures | Major | proc-v2 |
| [HBASE-21377](https://issues.apache.org/jira/browse/HBASE-21377) | Add debug log for procedure stack id related operations | Major | proc-v2 |
| [HBASE-21472](https://issues.apache.org/jira/browse/HBASE-21472) | Should not persist the dispatched field for RegionRemoteProcedureBase | Major | amv2 |
| [HBASE-21473](https://issues.apache.org/jira/browse/HBASE-21473) | RowIndexSeekerV1 may return cell with extra two \\x00\\x00 bytes which has no tags | Major | . |
| [HBASE-21463](https://issues.apache.org/jira/browse/HBASE-21463) | The checkOnlineRegionsReport can accidentally complete a TRSP | Critical | amv2 |
| [HBASE-21376](https://issues.apache.org/jira/browse/HBASE-21376) | Add some verbose log to MasterProcedureScheduler | Major | logging, proc-v2 |
| [HBASE-21443](https://issues.apache.org/jira/browse/HBASE-21443) | [hbase-connectors] Purge hbase-\* modules from core now they've been moved to hbase-connectors | Major | hbase-connectors, spark |
| [HBASE-21421](https://issues.apache.org/jira/browse/HBASE-21421) | Do not kill RS if reportOnlineRegions fails | Major | . |
| [HBASE-21314](https://issues.apache.org/jira/browse/HBASE-21314) | The implementation of BitSetNode is not efficient | Major | proc-v2 |
| [HBASE-21351](https://issues.apache.org/jira/browse/HBASE-21351) | The force update thread may have race with PE worker when the procedure is rolling back | Critical | proc-v2 |
| [HBASE-21191](https://issues.apache.org/jira/browse/HBASE-21191) | Add a holding-pattern if no assign for meta or namespace (Can happen if masterprocwals have been cleared). | Major | amv2 |
| [HBASE-21322](https://issues.apache.org/jira/browse/HBASE-21322) | Add a scheduleServerCrashProcedure() API to HbckService | Critical | hbck2 |
| [HBASE-21375](https://issues.apache.org/jira/browse/HBASE-21375) | Revisit the lock and queue implementation in MasterProcedureScheduler | Major | proc-v2 |
| [HBASE-20973](https://issues.apache.org/jira/browse/HBASE-20973) | ArrayIndexOutOfBoundsException when rolling back procedure | Critical | amv2 |
| [HBASE-21384](https://issues.apache.org/jira/browse/HBASE-21384) | Procedure with holdlock=false should not be restored lock when restarts | Blocker | . |
| [HBASE-21364](https://issues.apache.org/jira/browse/HBASE-21364) | Procedure holds the lock should put to front of the queue after restart | Blocker | . |
| [HBASE-21215](https://issues.apache.org/jira/browse/HBASE-21215) | Figure how to invoke hbck2; make it easy to find | Major | amv2, hbck2 |
| [HBASE-21372](https://issues.apache.org/jira/browse/HBASE-21372) | Set hbase.assignment.maximum.attempts to Long.MAX | Major | amv2 |
| [HBASE-21363](https://issues.apache.org/jira/browse/HBASE-21363) | Rewrite the buildingHoldCleanupTracker method in WALProcedureStore | Major | proc-v2 |
| [HBASE-21338](https://issues.apache.org/jira/browse/HBASE-21338) | [balancer] If balancer is an ill-fit for cluster size, it gives little indication | Major | Balancer, Operability |
| [HBASE-21192](https://issues.apache.org/jira/browse/HBASE-21192) | Add HOW-TO repair damaged AMv2. | Major | amv2 |
| [HBASE-21073](https://issues.apache.org/jira/browse/HBASE-21073) | "Maintenance mode" master | Major | amv2, hbck2, master |
| [HBASE-21354](https://issues.apache.org/jira/browse/HBASE-21354) | Procedure may be deleted improperly during master restarts resulting in 'Corrupt' | Major | . |
| [HBASE-21336](https://issues.apache.org/jira/browse/HBASE-21336) | Simplify the implementation of WALProcedureMap | Major | proc-v2 |
| [HBASE-21323](https://issues.apache.org/jira/browse/HBASE-21323) | Should not skip force updating for a sub procedure even if it has been finished | Major | proc-v2 |
| [HBASE-21269](https://issues.apache.org/jira/browse/HBASE-21269) | Forward-port to branch-2 " HBASE-21213 [hbck2] bypass leaves behind state in RegionStates when assign/unassign" | Major | amv2 |
| [HBASE-20716](https://issues.apache.org/jira/browse/HBASE-20716) | Unsafe access cleanup | Critical | Performance |
| [HBASE-21330](https://issues.apache.org/jira/browse/HBASE-21330) | ReopenTableRegionsProcedure will enter an infinite loop if we schedule a TRSP at the same time | Major | amv2 |
| [HBASE-21310](https://issues.apache.org/jira/browse/HBASE-21310) | Split TestCloneSnapshotFromClient | Major | test |
| [HBASE-21311](https://issues.apache.org/jira/browse/HBASE-21311) | Split TestRestoreSnapshotFromClient | Major | test |
| [HBASE-21315](https://issues.apache.org/jira/browse/HBASE-21315) | The getActiveMinProcId and getActiveMaxProcId of BitSetNode are incorrect if there are no active procedure | Major | . |
| [HBASE-21278](https://issues.apache.org/jira/browse/HBASE-21278) | Do not rollback successful sub procedures when rolling back a procedure | Critical | proc-v2 |
| [HBASE-21309](https://issues.apache.org/jira/browse/HBASE-21309) | Increase the waiting timeout for TestProcedurePriority | Major | test |
| [HBASE-21254](https://issues.apache.org/jira/browse/HBASE-21254) | Need to find a way to limit the number of proc wal files | Critical | proc-v2 |
| [HBASE-21250](https://issues.apache.org/jira/browse/HBASE-21250) | Refactor WALProcedureStore and add more comments for better understanding the implementation | Major | proc-v2 |
| [HBASE-19275](https://issues.apache.org/jira/browse/HBASE-19275) | TestSnapshotFileCache never worked properly | Major | . |
| [HBASE-21249](https://issues.apache.org/jira/browse/HBASE-21249) | Add jitter for ProcedureUtil.getBackoffTimeMs | Major | proc-v2 |
| [HBASE-21244](https://issues.apache.org/jira/browse/HBASE-21244) | Skip persistence when retrying for assignment related procedures | Major | amv2, Performance, proc-v2 |
| [HBASE-21233](https://issues.apache.org/jira/browse/HBASE-21233) | Allow the procedure implementation to skip persistence of the state after a execution | Major | Performance, proc-v2 |
| [HBASE-21227](https://issues.apache.org/jira/browse/HBASE-21227) | Implement exponential retrying backoff for Assign/UnassignRegionHandler introduced in HBASE-21217 | Major | amv2, regionserver |
| [HBASE-21217](https://issues.apache.org/jira/browse/HBASE-21217) | Revisit the executeProcedure method for open/close region | Critical | amv2, proc-v2 |
| [HBASE-21214](https://issues.apache.org/jira/browse/HBASE-21214) | [hbck2] setTableState just sets hbase:meta state, not in-memory state | Major | amv2, hbck2 |
| [HBASE-21023](https://issues.apache.org/jira/browse/HBASE-21023) | Add bypassProcedureToCompletion() API to HbckService | Major | hbck2 |
| [HBASE-21156](https://issues.apache.org/jira/browse/HBASE-21156) | [hbck2] Queue an assign of hbase:meta and bulk assign/unassign | Critical | hbck2 |
| [HBASE-21169](https://issues.apache.org/jira/browse/HBASE-21169) | Initiate hbck2 tool in hbase-operator-tools repo | Major | hbck2 |
| [HBASE-21172](https://issues.apache.org/jira/browse/HBASE-21172) | Reimplement the retry backoff logic for ReopenTableRegionsProcedure | Major | amv2, proc-v2 |
| [HBASE-21189](https://issues.apache.org/jira/browse/HBASE-21189) | flaky job should gather machine stats | Minor | test |
| [HBASE-21190](https://issues.apache.org/jira/browse/HBASE-21190) | Log files and count of entries in each as we load from the MasterProcWAL store | Major | amv2 |
| [HBASE-21083](https://issues.apache.org/jira/browse/HBASE-21083) | Introduce a mechanism to bypass the execution of a stuck procedure | Major | amv2 |
| [HBASE-21017](https://issues.apache.org/jira/browse/HBASE-21017) | Revisit the expected states for open/close | Major | amv2 |
| [HBASE-20941](https://issues.apache.org/jira/browse/HBASE-20941) | Create and implement HbckService in master | Major | . |
| [HBASE-21072](https://issues.apache.org/jira/browse/HBASE-21072) | Block out HBCK1 in hbase2 | Major | hbck |
| [HBASE-21095](https://issues.apache.org/jira/browse/HBASE-21095) | The timeout retry logic for several procedures are broken after master restarts | Critical | amv2, proc-v2 |
| [HBASE-20975](https://issues.apache.org/jira/browse/HBASE-20975) | Lock may not be taken or released while rolling back procedure | Major | amv2 |
| [HBASE-21025](https://issues.apache.org/jira/browse/HBASE-21025) | Add cache for TableStateManager | Major | . |
| [HBASE-21012](https://issues.apache.org/jira/browse/HBASE-21012) | Revert the change of serializing TimeRangeTracker | Critical | . |
| [HBASE-20813](https://issues.apache.org/jira/browse/HBASE-20813) | Remove RPC quotas when the associated table/Namespace is dropped off | Minor | . |
| [HBASE-20885](https://issues.apache.org/jira/browse/HBASE-20885) | Remove entry for RPC quota from hbase:quota when RPC quota is removed. | Minor | . |
| [HBASE-20893](https://issues.apache.org/jira/browse/HBASE-20893) | Data loss if splitting region while ServerCrashProcedure executing | Major | . |
| [HBASE-20950](https://issues.apache.org/jira/browse/HBASE-20950) | Helper method to configure secure DFS cluster for tests | Major | test |
| [HBASE-19369](https://issues.apache.org/jira/browse/HBASE-19369) | HBase Should use Builder Pattern to Create Log Files while using WAL on Erasure Coding | Major | . |
| [HBASE-20939](https://issues.apache.org/jira/browse/HBASE-20939) | There will be race when we call suspendIfNotReady and then throw ProcedureSuspendedException | Critical | amv2 |
| [HBASE-20921](https://issues.apache.org/jira/browse/HBASE-20921) | Possible NPE in ReopenTableRegionsProcedure | Major | amv2 |
| [HBASE-20867](https://issues.apache.org/jira/browse/HBASE-20867) | RS may get killed while master restarts | Major | . |
| [HBASE-20878](https://issues.apache.org/jira/browse/HBASE-20878) | Data loss if merging regions while ServerCrashProcedure executing | Critical | amv2 |
| [HBASE-20846](https://issues.apache.org/jira/browse/HBASE-20846) | Restore procedure locks when master restarts | Major | . |
| [HBASE-20914](https://issues.apache.org/jira/browse/HBASE-20914) | Trim Master memory usage | Major | Balancer, master |
| [HBASE-20853](https://issues.apache.org/jira/browse/HBASE-20853) | Polish "Add defaults to Table Interface so Implementors don't have to" | Major | API |
| [HBASE-20875](https://issues.apache.org/jira/browse/HBASE-20875) | MemStoreLABImp::copyIntoCell uses 7% CPU when writing | Major | Performance |
| [HBASE-20860](https://issues.apache.org/jira/browse/HBASE-20860) | Merged region's RIT state may not be cleaned after master restart | Major | . |
| [HBASE-20847](https://issues.apache.org/jira/browse/HBASE-20847) | The parent procedure of RegionTransitionProcedure may not have the table lock | Major | proc-v2, Region Assignment |
| [HBASE-20776](https://issues.apache.org/jira/browse/HBASE-20776) | Update branch-2 version to 2.2.0-SNAPSHOT | Major | build |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-21612](https://issues.apache.org/jira/browse/HBASE-21612) | Add developer debug options in HBase Config for REST server | Minor | Operability, REST, scripts |
| [HBASE-18735](https://issues.apache.org/jira/browse/HBASE-18735) | Provide a fast mechanism for shutting down mini cluster | Major | . |
| [HBASE-21489](https://issues.apache.org/jira/browse/HBASE-21489) | TestShell is broken | Major | shell |
| [HBASE-20152](https://issues.apache.org/jira/browse/HBASE-20152) | [AMv2] DisableTableProcedure versus ServerCrashProcedure | Major | amv2 |
| [HBASE-20540](https://issues.apache.org/jira/browse/HBASE-20540) | [umbrella] Hadoop 3 compatibility | Major | . |
| [HBASE-21536](https://issues.apache.org/jira/browse/HBASE-21536) | Fix completebulkload usage instructions | Trivial | documentation, mapreduce |
| [HBASE-22449](https://issues.apache.org/jira/browse/HBASE-22449) | https everywhere in Maven metadata | Minor | . |
| [HBASE-22406](https://issues.apache.org/jira/browse/HBASE-22406) | skip generating rdoc when building gems in our docker image for running yetus | Critical | build, test |
| [HBASE-22375](https://issues.apache.org/jira/browse/HBASE-22375) | Promote AccessChecker to LimitedPrivate(Coprocessor) | Minor | Coprocessors, security |
| [HBASE-21714](https://issues.apache.org/jira/browse/HBASE-21714) | Deprecated isTableAvailableWithSplit method in thrift module | Major | Thrift |
| [HBASE-22359](https://issues.apache.org/jira/browse/HBASE-22359) | Backport of HBASE-21371 misses activation-api license information | Minor | build, community |
| [HBASE-22174](https://issues.apache.org/jira/browse/HBASE-22174) | Remove error prone from our precommit javac check | Major | build |
| [HBASE-22231](https://issues.apache.org/jira/browse/HBASE-22231) | Remove unused and \* imports | Minor | . |
| [HBASE-22304](https://issues.apache.org/jira/browse/HBASE-22304) | Fix remaining Checkstyle issues in hbase-endpoint | Trivial | . |
| [HBASE-22020](https://issues.apache.org/jira/browse/HBASE-22020) | upgrade to yetus 0.9.0 | Major | build, community |
| [HBASE-22187](https://issues.apache.org/jira/browse/HBASE-22187) | Remove usage of deprecated ClusterConnection.clearRegionCache | Trivial | Client |
| [HBASE-22203](https://issues.apache.org/jira/browse/HBASE-22203) | Reformat DemoClient.java | Trivial | . |
| [HBASE-22189](https://issues.apache.org/jira/browse/HBASE-22189) | Remove usage of StoreFile.getModificationTimeStamp | Trivial | . |
| [HBASE-22108](https://issues.apache.org/jira/browse/HBASE-22108) | Avoid passing null in Admin methods | Major | Admin |
| [HBASE-22007](https://issues.apache.org/jira/browse/HBASE-22007) | Add restoreSnapshot and cloneSnapshot with acl methods in AsyncAdmin | Major | Admin, asyncclient, Client |
| [HBASE-22131](https://issues.apache.org/jira/browse/HBASE-22131) | Delete the patches in hbase-protocol-shaded module | Major | build, Protobufs |
| [HBASE-22099](https://issues.apache.org/jira/browse/HBASE-22099) | Backport HBASE-21895 "Error prone upgrade" to branch-2 | Major | build |
| [HBASE-22052](https://issues.apache.org/jira/browse/HBASE-22052) | pom cleaning; filter out jersey-core in hadoop2 to match hadoop3 and remove redunant version specifications | Major | . |
| [HBASE-22065](https://issues.apache.org/jira/browse/HBASE-22065) | Add listTableDescriptors(List\) method in AsyncAdmin | Major | Admin |
| [HBASE-22042](https://issues.apache.org/jira/browse/HBASE-22042) | Missing @Override annotation for RawAsyncTableImpl.scan | Major | asyncclient, Client |
| [HBASE-21057](https://issues.apache.org/jira/browse/HBASE-21057) | upgrade to latest spotbugs | Minor | community, test |
| [HBASE-21888](https://issues.apache.org/jira/browse/HBASE-21888) | Add a isClosed method to AsyncConnection | Major | asyncclient, Client |
| [HBASE-21884](https://issues.apache.org/jira/browse/HBASE-21884) | Fix box/unbox findbugs warning in secure bulk load | Minor | . |
| [HBASE-21859](https://issues.apache.org/jira/browse/HBASE-21859) | Add clearRegionLocationCache method for AsyncConnection | Major | asyncclient, Client |
| [HBASE-21853](https://issues.apache.org/jira/browse/HBASE-21853) | update copyright notices to 2019 | Major | documentation |
| [HBASE-21791](https://issues.apache.org/jira/browse/HBASE-21791) | Upgrade thrift dependency to 0.12.0 | Blocker | Thrift |
| [HBASE-21710](https://issues.apache.org/jira/browse/HBASE-21710) | Add quota related methods to the Admin interface | Major | . |
| [HBASE-21782](https://issues.apache.org/jira/browse/HBASE-21782) | LoadIncrementalHFiles should not be IA.Public | Major | mapreduce |
| [HBASE-21762](https://issues.apache.org/jira/browse/HBASE-21762) | Move some methods in ClusterConnection to Connection | Major | Client |
| [HBASE-21715](https://issues.apache.org/jira/browse/HBASE-21715) | Do not throw UnsupportedOperationException in ProcedureFuture.get | Major | Client |
| [HBASE-21716](https://issues.apache.org/jira/browse/HBASE-21716) | Add toStringCustomizedValues to TableDescriptor | Major | . |
| [HBASE-21731](https://issues.apache.org/jira/browse/HBASE-21731) | Do not need to use ClusterConnection in IntegrationTestBigLinkedListWithVisibility | Major | . |
| [HBASE-21685](https://issues.apache.org/jira/browse/HBASE-21685) | Change repository urls to Gitbox | Critical | . |
| [HBASE-21534](https://issues.apache.org/jira/browse/HBASE-21534) | TestAssignmentManager is flakey | Major | test |
| [HBASE-21541](https://issues.apache.org/jira/browse/HBASE-21541) | Move MetaTableLocator.verifyRegionLocation to hbase-rsgroup module | Major | . |
| [HBASE-21265](https://issues.apache.org/jira/browse/HBASE-21265) | Split up TestRSGroups | Minor | rsgroup, test |
| [HBASE-21517](https://issues.apache.org/jira/browse/HBASE-21517) | Move the getTableRegionForRow method from HMaster to TestMaster | Major | test |
| [HBASE-21281](https://issues.apache.org/jira/browse/HBASE-21281) | Update bouncycastle dependency. | Major | dependencies, test |
| [HBASE-21198](https://issues.apache.org/jira/browse/HBASE-21198) | Exclude dependency on net.minidev:json-smart | Major | . |
| [HBASE-21282](https://issues.apache.org/jira/browse/HBASE-21282) | Upgrade to latest jetty 9.2 and 9.3 versions | Major | dependencies |
| [HBASE-21287](https://issues.apache.org/jira/browse/HBASE-21287) | JVMClusterUtil Master initialization wait time not configurable | Major | test |
| [HBASE-21168](https://issues.apache.org/jira/browse/HBASE-21168) | BloomFilterUtil uses hardcoded randomness | Trivial | . |
| [HBASE-20482](https://issues.apache.org/jira/browse/HBASE-20482) | Print a link to the ref guide chapter for the shell during startup | Minor | documentation, shell |
| [HBASE-20942](https://issues.apache.org/jira/browse/HBASE-20942) | Improve RpcServer TRACE logging | Major | Operability |
| [HBASE-20989](https://issues.apache.org/jira/browse/HBASE-20989) | Minor, miscellaneous logging fixes | Trivial | logging |
## Release 2.1.0 - Unreleased (as of 2018-07-10)
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20691](https://issues.apache.org/jira/browse/HBASE-20691) | Storage policy should allow deferring to HDFS | Blocker | Filesystem Integration, wal |
| [HBASE-20270](https://issues.apache.org/jira/browse/HBASE-20270) | Turn off command help that follows all errors in shell | Major | shell |
| [HBASE-20501](https://issues.apache.org/jira/browse/HBASE-20501) | Change the Hadoop minimum version to 2.7.1 | Blocker | community, documentation |
| [HBASE-20406](https://issues.apache.org/jira/browse/HBASE-20406) | HBase Thrift HTTP - Shouldn't handle TRACE/OPTIONS methods | Major | security, Thrift |
| [HBASE-20159](https://issues.apache.org/jira/browse/HBASE-20159) | Support using separate ZK quorums for client | Major | Client, Operability, Zookeeper |
| [HBASE-20148](https://issues.apache.org/jira/browse/HBASE-20148) | Make serial replication as a option for a peer instead of a table | Major | Replication |
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20833](https://issues.apache.org/jira/browse/HBASE-20833) | Modify pre-upgrade coprocessor validator to support table level coprocessors | Major | Coprocessors |
| [HBASE-15809](https://issues.apache.org/jira/browse/HBASE-15809) | Basic Replication WebUI | Critical | Replication, UI |
| [HBASE-19735](https://issues.apache.org/jira/browse/HBASE-19735) | Create a minimal "client" tarball installation | Major | build, Client |
| [HBASE-20656](https://issues.apache.org/jira/browse/HBASE-20656) | Validate pre-2.0 coprocessors against HBase 2.0+ | Major | tooling |
| [HBASE-20592](https://issues.apache.org/jira/browse/HBASE-20592) | Create a tool to verify tables do not have prefix tree encoding | Minor | Operability, tooling |
| [HBASE-20046](https://issues.apache.org/jira/browse/HBASE-20046) | Reconsider the implementation for serial replication | Major | Replication |
| [HBASE-19397](https://issues.apache.org/jira/browse/HBASE-19397) | Design procedures for ReplicationManager to notify peer change event from master | Major | proc-v2, Replication |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20806](https://issues.apache.org/jira/browse/HBASE-20806) | Split style journal for flushes and compactions | Minor | . |
| [HBASE-20474](https://issues.apache.org/jira/browse/HBASE-20474) | Show non-RPC tasks on master/regionserver Web UI by default | Major | UI |
| [HBASE-20826](https://issues.apache.org/jira/browse/HBASE-20826) | Truncate responseInfo attributes on RpcServer WARN messages | Major | rpc |
| [HBASE-20450](https://issues.apache.org/jira/browse/HBASE-20450) | Provide metrics for number of total active, priority and replication rpc handlers | Major | metrics |
| [HBASE-20810](https://issues.apache.org/jira/browse/HBASE-20810) | Include the procedure id in the exception message in HBaseAdmin for better debugging | Major | Admin, proc-v2 |
| [HBASE-20040](https://issues.apache.org/jira/browse/HBASE-20040) | Master UI should include "Cluster Key" needed to use the cluster as a replication sink | Minor | Replication, Usability |
| [HBASE-20095](https://issues.apache.org/jira/browse/HBASE-20095) | Redesign single instance pool in CleanerChore | Critical | . |
| [HBASE-19164](https://issues.apache.org/jira/browse/HBASE-19164) | Avoid UUID.randomUUID in tests | Major | test |
| [HBASE-20739](https://issues.apache.org/jira/browse/HBASE-20739) | Add priority for SCP | Major | Recovery |
| [HBASE-20737](https://issues.apache.org/jira/browse/HBASE-20737) | put collection into ArrayList instead of addAll function | Trivial | . |
| [HBASE-20695](https://issues.apache.org/jira/browse/HBASE-20695) | Implement table level RegionServer replication metrics | Minor | metrics |
| [HBASE-20733](https://issues.apache.org/jira/browse/HBASE-20733) | QABot should run checkstyle tests if the checkstyle configs change | Minor | build, community |
| [HBASE-20625](https://issues.apache.org/jira/browse/HBASE-20625) | refactor some WALCellCodec related code | Minor | wal |
| [HBASE-19852](https://issues.apache.org/jira/browse/HBASE-19852) | HBase Thrift 1 server SPNEGO Improvements | Major | Thrift |
| [HBASE-20579](https://issues.apache.org/jira/browse/HBASE-20579) | Improve snapshot manifest copy in ExportSnapshot | Minor | mapreduce |
| [HBASE-20444](https://issues.apache.org/jira/browse/HBASE-20444) | Improve version comparison logic for HBase specific version string and add unit tests | Major | util |
| [HBASE-20594](https://issues.apache.org/jira/browse/HBASE-20594) | provide utility to compare old and new descriptors | Major | . |
| [HBASE-20640](https://issues.apache.org/jira/browse/HBASE-20640) | TestQuotaGlobalsSettingsBypass missing test category and ClassRule | Critical | test |
| [HBASE-20478](https://issues.apache.org/jira/browse/HBASE-20478) | move import checks from hbaseanti to checkstyle | Minor | test |
| [HBASE-20548](https://issues.apache.org/jira/browse/HBASE-20548) | Master fails to startup on large clusters, refreshing block distribution | Major | . |
| [HBASE-20488](https://issues.apache.org/jira/browse/HBASE-20488) | PE tool prints full name in help message | Minor | shell |
| [HBASE-20567](https://issues.apache.org/jira/browse/HBASE-20567) | Pass both old and new descriptors to pre/post hooks of modify operations for table and namespace | Major | . |
| [HBASE-20545](https://issues.apache.org/jira/browse/HBASE-20545) | Improve performance of BaseLoadBalancer.retainAssignment | Major | Balancer |
| [HBASE-16191](https://issues.apache.org/jira/browse/HBASE-16191) | Add stop\_regionserver and stop\_master to shell | Major | . |
| [HBASE-20536](https://issues.apache.org/jira/browse/HBASE-20536) | Make TestRegionServerAccounting stable and it should not use absolute number | Minor | . |
| [HBASE-20523](https://issues.apache.org/jira/browse/HBASE-20523) | PE tool should support configuring client side buffering sizes | Minor | . |
| [HBASE-20527](https://issues.apache.org/jira/browse/HBASE-20527) | Remove unused code in MetaTableAccessor | Trivial | . |
| [HBASE-20507](https://issues.apache.org/jira/browse/HBASE-20507) | Do not need to call recoverLease on the broken file when we fail to create a wal writer | Major | wal |
| [HBASE-20484](https://issues.apache.org/jira/browse/HBASE-20484) | Remove the unnecessary autoboxing in FilterListBase | Trivial | . |
| [HBASE-20327](https://issues.apache.org/jira/browse/HBASE-20327) | When qualifier is not specified, append and incr operation do not work (shell) | Minor | shell |
| [HBASE-20389](https://issues.apache.org/jira/browse/HBASE-20389) | Move website building flags into a profile | Minor | build, website |
| [HBASE-20379](https://issues.apache.org/jira/browse/HBASE-20379) | shadedjars yetus plugin should add a footer link | Major | test |
| [HBASE-20243](https://issues.apache.org/jira/browse/HBASE-20243) | [Shell] Add shell command to create a new table by cloning the existent table | Minor | shell |
| [HBASE-20286](https://issues.apache.org/jira/browse/HBASE-20286) | Improving shell command compaction\_state | Minor | shell |
| [HBASE-19488](https://issues.apache.org/jira/browse/HBASE-19488) | Move to using Apache commons CollectionUtils | Trivial | . |
| [HBASE-20197](https://issues.apache.org/jira/browse/HBASE-20197) | Review of ByteBufferWriterOutputStream.java | Minor | . |
| [HBASE-20047](https://issues.apache.org/jira/browse/HBASE-20047) | AuthenticationTokenIdentifier should provide a toString | Minor | Usability |
| [HBASE-19024](https://issues.apache.org/jira/browse/HBASE-19024) | Configurable default durability for synchronous WAL | Critical | wal |
| [HBASE-19389](https://issues.apache.org/jira/browse/HBASE-19389) | Limit concurrency of put with dense (hundreds) columns to prevent write handler exhausted | Critical | Performance |
| [HBASE-20186](https://issues.apache.org/jira/browse/HBASE-20186) | Improve RSGroupBasedLoadBalancer#balanceCluster() to be more efficient when calculating cluster state for each rsgroup | Minor | rsgroup |
| [HBASE-19449](https://issues.apache.org/jira/browse/HBASE-19449) | Minor logging change in HFileArchiver | Trivial | . |
| [HBASE-20120](https://issues.apache.org/jira/browse/HBASE-20120) | Remove some unused classes/ java files from hbase-server | Minor | . |
### BUG FIXES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20854](https://issues.apache.org/jira/browse/HBASE-20854) | Wrong retries number in RpcRetryingCaller's log message | Minor | Client, logging |
| [HBASE-20784](https://issues.apache.org/jira/browse/HBASE-20784) | Will lose the SNAPSHOT suffix if we get the version of RS from ServerManager | Minor | master, UI |
| [HBASE-20822](https://issues.apache.org/jira/browse/HBASE-20822) | TestAsyncNonMetaRegionLocator is flakey | Major | asyncclient |
| [HBASE-20808](https://issues.apache.org/jira/browse/HBASE-20808) | Wrong shutdown order between Chores and ChoreService | Minor | . |
| [HBASE-20789](https://issues.apache.org/jira/browse/HBASE-20789) | TestBucketCache#testCacheBlockNextBlockMetadataMissing is flaky | Major | . |
| [HBASE-20829](https://issues.apache.org/jira/browse/HBASE-20829) | Remove the addFront assertion in MasterProcedureScheduler.doAdd | Major | Replication |
| [HBASE-20825](https://issues.apache.org/jira/browse/HBASE-20825) | Fix pre and post hooks of CloneSnapshot and RestoreSnapshot for Access checks | Major | security |
| [HBASE-20812](https://issues.apache.org/jira/browse/HBASE-20812) | Add defaults to Table Interface so implementors don't have to | Major | . |
| [HBASE-20817](https://issues.apache.org/jira/browse/HBASE-20817) | Infinite loop when executing ReopenTableRegionsProcedure | Blocker | Region Assignment |
| [HBASE-20792](https://issues.apache.org/jira/browse/HBASE-20792) | info:servername and info:sn inconsistent for OPEN region | Blocker | Region Assignment |
| [HBASE-20769](https://issues.apache.org/jira/browse/HBASE-20769) | getSplits() has a out of bounds problem in TableSnapshotInputFormatImpl | Major | . |
| [HBASE-20732](https://issues.apache.org/jira/browse/HBASE-20732) | Shutdown scan pool when master is stopped. | Minor | . |
| [HBASE-20785](https://issues.apache.org/jira/browse/HBASE-20785) | NPE getting metrics in PE testing scans | Major | Performance |
| [HBASE-20795](https://issues.apache.org/jira/browse/HBASE-20795) | Allow option in BBKVComparator.compare to do comparison without sequence id | Major | . |
| [HBASE-20777](https://issues.apache.org/jira/browse/HBASE-20777) | RpcConnection could still remain opened after we shutdown the NettyRpcServer | Major | rpc |
| [HBASE-20403](https://issues.apache.org/jira/browse/HBASE-20403) | Prefetch sometimes doesn't work with encrypted file system | Major | . |
| [HBASE-20635](https://issues.apache.org/jira/browse/HBASE-20635) | Support to convert the shaded user permission proto to client user permission object | Major | . |
| [HBASE-20778](https://issues.apache.org/jira/browse/HBASE-20778) | Make it so WALPE runs on DFS | Major | test |
| [HBASE-20775](https://issues.apache.org/jira/browse/HBASE-20775) | TestMultiParallel is flakey | Major | Region Assignment |
| [HBASE-20752](https://issues.apache.org/jira/browse/HBASE-20752) | Make sure the regions are truly reopened after ReopenTableRegionsProcedure | Major | proc-v2 |
| [HBASE-18622](https://issues.apache.org/jira/browse/HBASE-18622) | Mitigate API compatibility concerns between branch-1 and branch-2 | Blocker | API |
| [HBASE-20767](https://issues.apache.org/jira/browse/HBASE-20767) | Always close hbaseAdmin along with connection in HBTU | Major | test |
| [HBASE-20642](https://issues.apache.org/jira/browse/HBASE-20642) | IntegrationTestDDLMasterFailover throws 'InvalidFamilyOperationException | Major | . |
| [HBASE-20742](https://issues.apache.org/jira/browse/HBASE-20742) | Always create WAL directory for region server | Major | wal |
| [HBASE-20708](https://issues.apache.org/jira/browse/HBASE-20708) | Remove the usage of RecoverMetaProcedure in master startup | Blocker | proc-v2, Region Assignment |
| [HBASE-20723](https://issues.apache.org/jira/browse/HBASE-20723) | Custom hbase.wal.dir results in data loss because we write recovered edits into a different place than where the recovering region server looks for them | Critical | Recovery, wal |
| [HBASE-20681](https://issues.apache.org/jira/browse/HBASE-20681) | IntegrationTestDriver fails after HADOOP-15406 due to missing hamcrest-core | Major | integration tests |
| [HBASE-20561](https://issues.apache.org/jira/browse/HBASE-20561) | The way we stop a ReplicationSource may cause the RS down | Major | Replication |
| [HBASE-19377](https://issues.apache.org/jira/browse/HBASE-19377) | Compatibility checker complaining about hash collisions | Major | community |
| [HBASE-20689](https://issues.apache.org/jira/browse/HBASE-20689) | Docker fails to install rubocop for precommit | Blocker | build |
| [HBASE-20707](https://issues.apache.org/jira/browse/HBASE-20707) | Move MissingSwitchDefault check from checkstyle to error-prone | Major | build |
| [HBASE-20699](https://issues.apache.org/jira/browse/HBASE-20699) | QuotaCache should cancel the QuotaRefresherChore service inside its stop() | Major | . |
| [HBASE-20590](https://issues.apache.org/jira/browse/HBASE-20590) | REST Java client is not able to negotiate with the server in the secure mode | Critical | REST, security |
| [HBASE-20683](https://issues.apache.org/jira/browse/HBASE-20683) | Incorrect return value for PreUpgradeValidator | Critical | . |
| [HBASE-20684](https://issues.apache.org/jira/browse/HBASE-20684) | org.apache.hadoop.hbase.client.Scan#setStopRow javadoc uses incorrect method | Trivial | Client, documentation |
| [HBASE-20678](https://issues.apache.org/jira/browse/HBASE-20678) | NPE in ReplicationSourceManager#NodeFailoverWorker | Minor | . |
| [HBASE-20670](https://issues.apache.org/jira/browse/HBASE-20670) | NPE in HMaster#isInMaintenanceMode | Minor | . |
| [HBASE-20634](https://issues.apache.org/jira/browse/HBASE-20634) | Reopen region while server crash can cause the procedure to be stuck | Critical | . |
| [HBASE-12882](https://issues.apache.org/jira/browse/HBASE-12882) | Log level for org.apache.hadoop.hbase package should be configurable | Major | . |
| [HBASE-20668](https://issues.apache.org/jira/browse/HBASE-20668) | Avoid permission change if ExportSnapshot's copy fails | Major | . |
| [HBASE-18116](https://issues.apache.org/jira/browse/HBASE-18116) | Replication source in-memory accounting should not include bulk transfer hfiles | Major | Replication |
| [HBASE-20602](https://issues.apache.org/jira/browse/HBASE-20602) | hbase.master.quota.observer.ignore property seems to be not taking effect | Minor | documentation |
| [HBASE-20664](https://issues.apache.org/jira/browse/HBASE-20664) | Variable shared across multiple threads | Major | . |
| [HBASE-20659](https://issues.apache.org/jira/browse/HBASE-20659) | Implement a reopen table regions procedure | Major | . |
| [HBASE-20582](https://issues.apache.org/jira/browse/HBASE-20582) | Bump up JRuby version because of some reported vulnerabilities | Major | dependencies, shell |
| [HBASE-20533](https://issues.apache.org/jira/browse/HBASE-20533) | Fix the flaky TestAssignmentManagerMetrics | Major | . |
| [HBASE-20597](https://issues.apache.org/jira/browse/HBASE-20597) | Use a lock to serialize access to a shared reference to ZooKeeperWatcher in HBaseReplicationEndpoint | Minor | Replication |
| [HBASE-20633](https://issues.apache.org/jira/browse/HBASE-20633) | Dropping a table containing a disable violation policy fails to remove the quota upon table delete | Major | . |
| [HBASE-20645](https://issues.apache.org/jira/browse/HBASE-20645) | Fix security\_available method in security.rb | Major | . |
| [HBASE-20612](https://issues.apache.org/jira/browse/HBASE-20612) | TestReplicationKillSlaveRSWithSeparateOldWALs sometimes fail because it uses an expired cluster conn | Major | . |
| [HBASE-20648](https://issues.apache.org/jira/browse/HBASE-20648) | HBASE-19364 "Truncate\_preserve fails with table when replica region \> 1" for master branch | Major | . |
| [HBASE-20588](https://issues.apache.org/jira/browse/HBASE-20588) | Space quota change after quota violation doesn't seem to take in effect | Major | regionserver |
| [HBASE-20616](https://issues.apache.org/jira/browse/HBASE-20616) | TruncateTableProcedure is stuck in retry loop in TRUNCATE\_TABLE\_CREATE\_FS\_LAYOUT state | Major | amv2 |
| [HBASE-20638](https://issues.apache.org/jira/browse/HBASE-20638) | nightly source artifact testing should fail the stage if it's going to report an error on jira | Major | test |
| [HBASE-20624](https://issues.apache.org/jira/browse/HBASE-20624) | Race in ReplicationSource which causes walEntryFilter being null when creating new shipper | Major | Replication |
| [HBASE-20601](https://issues.apache.org/jira/browse/HBASE-20601) | Add multiPut support and other miscellaneous to PE | Minor | tooling |
| [HBASE-20627](https://issues.apache.org/jira/browse/HBASE-20627) | Relocate RS Group pre/post hooks from RSGroupAdminServer to RSGroupAdminEndpoint | Major | . |
| [HBASE-20591](https://issues.apache.org/jira/browse/HBASE-20591) | nightly job doesn't respect maven options | Critical | test |
| [HBASE-20560](https://issues.apache.org/jira/browse/HBASE-20560) | Revisit the TestReplicationDroppedTables ut | Major | . |
| [HBASE-20571](https://issues.apache.org/jira/browse/HBASE-20571) | JMXJsonServlet generates invalid JSON if it has NaN in metrics | Major | UI |
| [HBASE-20585](https://issues.apache.org/jira/browse/HBASE-20585) | Need to clear peer map when clearing MasterProcedureScheduler | Major | proc-v2 |
| [HBASE-20457](https://issues.apache.org/jira/browse/HBASE-20457) | Return immediately for a scan rpc call when we want to switch from pread to stream | Major | scan |
| [HBASE-20447](https://issues.apache.org/jira/browse/HBASE-20447) | Only fail cacheBlock if block collisions aren't related to next block metadata | Major | BlockCache, BucketCache |
| [HBASE-20544](https://issues.apache.org/jira/browse/HBASE-20544) | downstream HBaseTestingUtility fails with invalid port | Blocker | test |
| [HBASE-20004](https://issues.apache.org/jira/browse/HBASE-20004) | Client is not able to execute REST queries in a secure cluster | Minor | REST, security |
| [HBASE-20475](https://issues.apache.org/jira/browse/HBASE-20475) | Fix the flaky TestReplicationDroppedTables unit test. | Major | . |
| [HBASE-20554](https://issues.apache.org/jira/browse/HBASE-20554) | "WALs outstanding" message from CleanerChore is noisy | Trivial | . |
| [HBASE-20204](https://issues.apache.org/jira/browse/HBASE-20204) | Add locking to RefreshFileConnections in BucketCache | Major | BucketCache |
| [HBASE-20485](https://issues.apache.org/jira/browse/HBASE-20485) | Copy constructor of Scan doesn't copy the readType and replicaId | Minor | . |
| [HBASE-20543](https://issues.apache.org/jira/browse/HBASE-20543) | Fix the flaky TestThriftHttpServer | Major | . |
| [HBASE-20521](https://issues.apache.org/jira/browse/HBASE-20521) | TableOutputFormat.checkOutputSpecs conf checking sequence cause pig script run fail | Major | mapreduce |
| [HBASE-20500](https://issues.apache.org/jira/browse/HBASE-20500) | [rsgroup] should keep at least one server in default group | Major | rsgroup |
| [HBASE-20517](https://issues.apache.org/jira/browse/HBASE-20517) | Fix PerformanceEvaluation 'column' parameter | Major | test |
| [HBASE-20524](https://issues.apache.org/jira/browse/HBASE-20524) | Need to clear metrics when ReplicationSourceManager refresh replication sources | Minor | . |
| [HBASE-20476](https://issues.apache.org/jira/browse/HBASE-20476) | Open sequence number could go backwards in AssignProcedure | Major | Region Assignment |
| [HBASE-20506](https://issues.apache.org/jira/browse/HBASE-20506) | Add doc and test for unused RetryCounter, useful-looking utility | Minor | . |
| [HBASE-20492](https://issues.apache.org/jira/browse/HBASE-20492) | UnassignProcedure is stuck in retry loop on region stuck in OPENING state | Critical | amv2 |
| [HBASE-20497](https://issues.apache.org/jira/browse/HBASE-20497) | The getRecoveredQueueStartPos always return 0 in RecoveredReplicationSourceShipper | Major | Replication |
| [HBASE-18842](https://issues.apache.org/jira/browse/HBASE-18842) | The hbase shell clone\_snaphost command returns bad error message | Minor | shell |
| [HBASE-20466](https://issues.apache.org/jira/browse/HBASE-20466) | Consistently use override mechanism for exempt classes in CoprocessClassloader | Major | Coprocessors |
| [HBASE-20006](https://issues.apache.org/jira/browse/HBASE-20006) | TestRestoreSnapshotFromClientWithRegionReplicas is flakey | Critical | read replicas |
| [HBASE-18059](https://issues.apache.org/jira/browse/HBASE-18059) | The scanner order for memstore scanners are wrong | Critical | regionserver, scan, Scanners |
| [HBASE-20404](https://issues.apache.org/jira/browse/HBASE-20404) | Ugly cleanerchore complaint that dir is not empty | Major | master |
| [HBASE-20419](https://issues.apache.org/jira/browse/HBASE-20419) | Fix potential NPE in ZKUtil#listChildrenAndWatchForNewChildren callers | Major | . |
| [HBASE-20364](https://issues.apache.org/jira/browse/HBASE-20364) | nightly job gives old results or no results for stages that timeout on SCM | Critical | test |
| [HBASE-20335](https://issues.apache.org/jira/browse/HBASE-20335) | nightly jobs no longer contain machine information | Critical | test |
| [HBASE-20338](https://issues.apache.org/jira/browse/HBASE-20338) | WALProcedureStore#recoverLease() should have fixed sleeps for retrying rollWriter() | Major | . |
| [HBASE-20356](https://issues.apache.org/jira/browse/HBASE-20356) | make skipping protoc possible | Critical | dependencies, thirdparty |
| [HBASE-15291](https://issues.apache.org/jira/browse/HBASE-15291) | FileSystem not closed in secure bulkLoad | Major | . |
| [HBASE-20068](https://issues.apache.org/jira/browse/HBASE-20068) | Hadoopcheck project health check uses default maven repo instead of yetus managed ones | Major | community, test |
| [HBASE-20361](https://issues.apache.org/jira/browse/HBASE-20361) | Non-successive TableInputSplits may wrongly be merged by auto balancing feature | Major | mapreduce |
| [HBASE-20260](https://issues.apache.org/jira/browse/HBASE-20260) | Purge old content from the book for branch-2/master | Critical | documentation |
| [HBASE-20058](https://issues.apache.org/jira/browse/HBASE-20058) | improper quoting in presplitting command docs | Minor | documentation |
| [HBASE-19923](https://issues.apache.org/jira/browse/HBASE-19923) | Reset peer state and config when refresh replication source failed | Major | Replication |
| [HBASE-19748](https://issues.apache.org/jira/browse/HBASE-19748) | TestRegionReplicaFailover and TestRegionReplicaReplicationEndpoint UT hangs | Major | . |
### TESTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20667](https://issues.apache.org/jira/browse/HBASE-20667) | Rename TestGlobalThrottler to TestReplicationGlobalThrottler | Trivial | . |
| [HBASE-20646](https://issues.apache.org/jira/browse/HBASE-20646) | TestWALProcedureStoreOnHDFS failing on branch-1 | Trivial | . |
| [HBASE-20505](https://issues.apache.org/jira/browse/HBASE-20505) | PE should support multi column family read and write cases | Minor | . |
| [HBASE-20513](https://issues.apache.org/jira/browse/HBASE-20513) | Collect and emit ScanMetrics in PerformanceEvaluation | Minor | test |
| [HBASE-20414](https://issues.apache.org/jira/browse/HBASE-20414) | TestLockProcedure#testMultipleLocks may fail on slow machine | Major | . |
### SUB-TASKS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20831](https://issues.apache.org/jira/browse/HBASE-20831) | Copy master doc into branch-2.1 and edit to make it suit 2.1.0 | Blocker | documentation |
| [HBASE-20839](https://issues.apache.org/jira/browse/HBASE-20839) | Fallback to FSHLog if we can not instantiated AsyncFSWAL when user does not specify AsyncFSWAL explicitly | Blocker | wal |
| [HBASE-20244](https://issues.apache.org/jira/browse/HBASE-20244) | NoSuchMethodException when retrieving private method decryptEncryptedDataEncryptionKey from DFSClient | Blocker | wal |
| [HBASE-20193](https://issues.apache.org/jira/browse/HBASE-20193) | Basic Replication Web UI - Regionserver | Critical | Replication, Usability |
| [HBASE-20489](https://issues.apache.org/jira/browse/HBASE-20489) | Update Reference Guide that CLUSTER\_KEY value is present on the Master UI info page. | Minor | documentation |
| [HBASE-19722](https://issues.apache.org/jira/browse/HBASE-19722) | Meta query statistics metrics source | Major | . |
| [HBASE-20781](https://issues.apache.org/jira/browse/HBASE-20781) | Save recalculating families in a WALEdit batch of Cells | Major | Performance |
| [HBASE-20194](https://issues.apache.org/jira/browse/HBASE-20194) | Basic Replication WebUI - Master | Critical | Replication, Usability |
| [HBASE-20780](https://issues.apache.org/jira/browse/HBASE-20780) | ServerRpcConnection logging cleanup | Major | logging, Performance |
| [HBASE-19764](https://issues.apache.org/jira/browse/HBASE-19764) | Fix Checkstyle errors in hbase-endpoint | Minor | . |
| [HBASE-20710](https://issues.apache.org/jira/browse/HBASE-20710) | extra cloneFamily() in Mutation.add(Cell) | Minor | regionserver |
| [HBASE-18569](https://issues.apache.org/jira/browse/HBASE-18569) | Add prefetch support for async region locator | Major | asyncclient, Client |
| [HBASE-20706](https://issues.apache.org/jira/browse/HBASE-20706) | [hack] Don't add known not-OPEN regions in reopen phase of MTP | Critical | amv2 |
| [HBASE-20334](https://issues.apache.org/jira/browse/HBASE-20334) | add a test that expressly uses both our shaded client and the one from hadoop 3 | Major | hadoop3, shading |
| [HBASE-20615](https://issues.apache.org/jira/browse/HBASE-20615) | emphasize use of shaded client jars when they're present in an install | Major | build, Client, Usability |
| [HBASE-20333](https://issues.apache.org/jira/browse/HBASE-20333) | break up shaded client into one with no Hadoop and one that's standalone | Critical | shading |
| [HBASE-20332](https://issues.apache.org/jira/browse/HBASE-20332) | shaded mapreduce module shouldn't include hadoop | Critical | mapreduce, shading |
| [HBASE-20722](https://issues.apache.org/jira/browse/HBASE-20722) | Make RegionServerTracker only depend on children changed event | Major | . |
| [HBASE-20700](https://issues.apache.org/jira/browse/HBASE-20700) | Move meta region when server crash can cause the procedure to be stuck | Critical | master, proc-v2, Region Assignment |
| [HBASE-20628](https://issues.apache.org/jira/browse/HBASE-20628) | SegmentScanner does over-comparing when one flushing | Critical | Performance |
| [HBASE-19761](https://issues.apache.org/jira/browse/HBASE-19761) | Fix Checkstyle errors in hbase-zookeeper | Minor | . |
| [HBASE-19724](https://issues.apache.org/jira/browse/HBASE-19724) | Fix Checkstyle errors in hbase-hadoop2-compat | Minor | . |
| [HBASE-20518](https://issues.apache.org/jira/browse/HBASE-20518) | Need to serialize the enabled field for UpdatePeerConfigProcedure | Major | Replication |
| [HBASE-20481](https://issues.apache.org/jira/browse/HBASE-20481) | Replicate entries from same region serially in ReplicationEndpoint for serial replication | Major | . |
| [HBASE-20378](https://issues.apache.org/jira/browse/HBASE-20378) | Provide a hbck option to cleanup replication barrier for a table | Major | . |
| [HBASE-20128](https://issues.apache.org/jira/browse/HBASE-20128) | Add new UTs which extends the old replication UTs but set replication scope to SERIAL | Major | . |
| [HBASE-20417](https://issues.apache.org/jira/browse/HBASE-20417) | Do not read wal entries when peer is disabled | Major | Replication |
| [HBASE-20294](https://issues.apache.org/jira/browse/HBASE-20294) | Also cleanup last pushed sequence id in ReplicationBarrierCleaner | Major | Replication |
| [HBASE-20377](https://issues.apache.org/jira/browse/HBASE-20377) | Deal with table in enabling and disabling state when modifying serial replication peer | Major | Replication |
| [HBASE-20367](https://issues.apache.org/jira/browse/HBASE-20367) | Write a replication barrier for regions when disabling a table | Major | Replication |
| [HBASE-20296](https://issues.apache.org/jira/browse/HBASE-20296) | Remove last pushed sequence ids when removing tables from a peer | Major | Replication |
| [HBASE-20285](https://issues.apache.org/jira/browse/HBASE-20285) | Delete all last pushed sequence ids when removing a peer or removing the serial flag for a peer | Major | Replication |
| [HBASE-20138](https://issues.apache.org/jira/browse/HBASE-20138) | Find a way to deal with the conflicts when updating replication position | Major | Replication |
| [HBASE-20127](https://issues.apache.org/jira/browse/HBASE-20127) | Add UT for serial replication after failover | Major | Replication, test |
| [HBASE-20271](https://issues.apache.org/jira/browse/HBASE-20271) | ReplicationSourceWALReader.switched should use the file name instead of the path object directly | Major | Replication |
| [HBASE-20227](https://issues.apache.org/jira/browse/HBASE-20227) | Add UT for ReplicationUtils.contains method | Major | Replication, test |
| [HBASE-20147](https://issues.apache.org/jira/browse/HBASE-20147) | Serial replication will be stuck if we create a table with serial replication but add it to a peer after there are region moves | Major | . |
| [HBASE-20116](https://issues.apache.org/jira/browse/HBASE-20116) | Optimize the region last pushed sequence id layout on zk | Major | Replication |
| [HBASE-20242](https://issues.apache.org/jira/browse/HBASE-20242) | The open sequence number will grow if we fail to open a region after writing the max sequence id file | Major | . |
| [HBASE-20155](https://issues.apache.org/jira/browse/HBASE-20155) | update branch-2 version to 2.1.0-SNAPSHOT | Major | build, community |
| [HBASE-20206](https://issues.apache.org/jira/browse/HBASE-20206) | WALEntryStream should not switch WAL file silently | Major | Replication |
| [HBASE-20117](https://issues.apache.org/jira/browse/HBASE-20117) | Cleanup the unused replication barriers in meta table | Major | master, Replication |
| [HBASE-20165](https://issues.apache.org/jira/browse/HBASE-20165) | Shell command to make a normal peer to be a serial replication peer | Major | . |
| [HBASE-20167](https://issues.apache.org/jira/browse/HBASE-20167) | Optimize the implementation of ReplicationSourceWALReader | Major | Replication |
| [HBASE-20125](https://issues.apache.org/jira/browse/HBASE-20125) | Add UT for serial replication after region split and merge | Major | Replication |
| [HBASE-20129](https://issues.apache.org/jira/browse/HBASE-20129) | Add UT for serial replication checker | Major | Replication |
| [HBASE-20115](https://issues.apache.org/jira/browse/HBASE-20115) | Reimplement serial replication based on the new replication storage layer | Major | Replication |
| [HBASE-20050](https://issues.apache.org/jira/browse/HBASE-20050) | Reimplement updateReplicationPositions logic in serial replication based on the newly introduced replication storage layer | Major | . |
| [HBASE-20082](https://issues.apache.org/jira/browse/HBASE-20082) | Fix findbugs errors only on master which are introduced by HBASE-19397 | Major | findbugs |
| [HBASE-19936](https://issues.apache.org/jira/browse/HBASE-19936) | Introduce a new base class for replication peer procedure | Major | . |
| [HBASE-19719](https://issues.apache.org/jira/browse/HBASE-19719) | Fix checkstyle issues | Major | proc-v2, Replication |
| [HBASE-19711](https://issues.apache.org/jira/browse/HBASE-19711) | TestReplicationAdmin.testConcurrentPeerOperations hangs | Major | proc-v2 |
| [HBASE-19707](https://issues.apache.org/jira/browse/HBASE-19707) | Race in start and terminate of a replication source after we async start replicatione endpoint | Major | proc-v2, Replication |
| [HBASE-19636](https://issues.apache.org/jira/browse/HBASE-19636) | All rs should already start work with the new peer change when replication peer procedure is finished | Major | proc-v2, Replication |
| [HBASE-19634](https://issues.apache.org/jira/browse/HBASE-19634) | Add permission check for executeProcedures in AccessController | Major | proc-v2, Replication |
| [HBASE-19697](https://issues.apache.org/jira/browse/HBASE-19697) | Remove TestReplicationAdminUsingProcedure | Major | proc-v2, Replication |
| [HBASE-19661](https://issues.apache.org/jira/browse/HBASE-19661) | Replace ReplicationStateZKBase with ZKReplicationStorageBase | Major | proc-v2, Replication |
| [HBASE-19687](https://issues.apache.org/jira/browse/HBASE-19687) | Move the logic in ReplicationZKNodeCleaner to ReplicationChecker and remove ReplicationZKNodeCleanerChore | Major | proc-v2, Replication |
| [HBASE-19544](https://issues.apache.org/jira/browse/HBASE-19544) | Add UTs for testing concurrent modifications on replication peer | Major | proc-v2, Replication, test |
| [HBASE-19686](https://issues.apache.org/jira/browse/HBASE-19686) | Use KeyLocker instead of ReentrantLock in PeerProcedureHandlerImpl | Major | proc-v2, Replication |
| [HBASE-19623](https://issues.apache.org/jira/browse/HBASE-19623) | Create replication endpoint asynchronously when adding a replication source | Major | proc-v2, Replication |
| [HBASE-19633](https://issues.apache.org/jira/browse/HBASE-19633) | Clean up the replication queues in the postPeerModification stage when removing a peer | Major | proc-v2, Replication |
| [HBASE-19622](https://issues.apache.org/jira/browse/HBASE-19622) | Reimplement ReplicationPeers with the new replication storage interface | Major | proc-v2, Replication |
| [HBASE-19635](https://issues.apache.org/jira/browse/HBASE-19635) | Introduce a thread at RS side to call reportProcedureDone | Major | proc-v2 |
| [HBASE-19617](https://issues.apache.org/jira/browse/HBASE-19617) | Remove ReplicationQueues, use ReplicationQueueStorage directly | Major | Replication |
| [HBASE-19642](https://issues.apache.org/jira/browse/HBASE-19642) | Fix locking for peer modification procedure | Critical | proc-v2, Replication |
| [HBASE-19592](https://issues.apache.org/jira/browse/HBASE-19592) | Add UTs to test retry on update zk failure | Major | proc-v2, Replication |
| [HBASE-19630](https://issues.apache.org/jira/browse/HBASE-19630) | Add peer cluster key check when add new replication peer | Major | proc-v2, Replication |
| [HBASE-19573](https://issues.apache.org/jira/browse/HBASE-19573) | Rewrite ReplicationPeer with the new replication storage interface | Major | proc-v2, Replication |
| [HBASE-19579](https://issues.apache.org/jira/browse/HBASE-19579) | Add peer lock test for shell command list\_locks | Major | proc-v2, Replication |
| [HBASE-19599](https://issues.apache.org/jira/browse/HBASE-19599) | Remove ReplicationQueuesClient, use ReplicationQueueStorage directly | Major | Replication |
| [HBASE-19543](https://issues.apache.org/jira/browse/HBASE-19543) | Abstract a replication storage interface to extract the zk specific code | Major | proc-v2, Replication |
| [HBASE-19525](https://issues.apache.org/jira/browse/HBASE-19525) | RS side changes for moving peer modification from zk watcher to procedure | Major | proc-v2, Replication |
| [HBASE-19580](https://issues.apache.org/jira/browse/HBASE-19580) | Use slf4j instead of commons-logging in new, just-added Peer Procedure classes | Major | proc-v2, Replication |
| [HBASE-19520](https://issues.apache.org/jira/browse/HBASE-19520) | Add UTs for the new lock type PEER | Major | proc-v2 |
| [HBASE-19564](https://issues.apache.org/jira/browse/HBASE-19564) | Procedure id is missing in the response of peer related operations | Major | proc-v2, Replication |
| [HBASE-19536](https://issues.apache.org/jira/browse/HBASE-19536) | Client side changes for moving peer modification from zk watcher to procedure | Major | Replication |
| [HBASE-19524](https://issues.apache.org/jira/browse/HBASE-19524) | Master side changes for moving peer modification from zk watcher to procedure | Major | proc-v2, Replication |
| [HBASE-19216](https://issues.apache.org/jira/browse/HBASE-19216) | Implement a general framework to execute remote procedure on RS | Major | proc-v2, Replication |
### OTHER:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19997](https://issues.apache.org/jira/browse/HBASE-19997) | [rolling upgrade] 1.x =\> 2.x | Blocker | . |
| [HBASE-20360](https://issues.apache.org/jira/browse/HBASE-20360) | Further optimization for serial replication | Major | Replication |
| [HBASE-20862](https://issues.apache.org/jira/browse/HBASE-20862) | Address 2.1.0 Compatibility Report Issues | Blocker | compatibility |
| [HBASE-20665](https://issues.apache.org/jira/browse/HBASE-20665) | "Already cached block XXX" message should be DEBUG | Minor | BlockCache |
| [HBASE-20677](https://issues.apache.org/jira/browse/HBASE-20677) | Backport test of HBASE-20566 'Creating a system table after enabling rsgroup feature puts region into RIT' to branch-2 | Major | . |
| [HBASE-19475](https://issues.apache.org/jira/browse/HBASE-19475) | Extend backporting strategy in documentation | Trivial | documentation |
| [HBASE-20595](https://issues.apache.org/jira/browse/HBASE-20595) | Remove the concept of 'special tables' from rsgroups | Major | Region Assignment, rsgroup |
| [HBASE-20415](https://issues.apache.org/jira/browse/HBASE-20415) | branches-2 don't need maven-scala-plugin | Major | build |
| [HBASE-20112](https://issues.apache.org/jira/browse/HBASE-20112) | Include test results from nightly hadoop3 tests in jenkins test results | Critical | test |
| [HBASE-17918](https://issues.apache.org/jira/browse/HBASE-17918) | document serial replication | Critical | documentation, Replication |
| [HBASE-19737](https://issues.apache.org/jira/browse/HBASE-19737) | Manage a HBASE-19397-branch-2 branch and merge it to branch-2 | Major | proc-v2, Replication |
## Release 2.0.0 - Unreleased (as of 2018-04-22)
### INCOMPATIBLE CHANGES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-20276](https://issues.apache.org/jira/browse/HBASE-20276) | [shell] Revert shell REPL change and document | Blocker | documentation, shell |
| [HBASE-16459](https://issues.apache.org/jira/browse/HBASE-16459) | Remove unused hbase shell --format option | Trivial | shell |
| [HBASE-19128](https://issues.apache.org/jira/browse/HBASE-19128) | Purge Distributed Log Replay from codebase, configurations, text; mark the feature as unsupported, broken. | Major | documentation |
| [HBASE-19504](https://issues.apache.org/jira/browse/HBASE-19504) | Add TimeRange support into checkAndMutate | Major | . |
| [HBASE-20119](https://issues.apache.org/jira/browse/HBASE-20119) | Introduce a pojo class to carry coprocessor information in order to make TableDescriptorBuilder accept multiple cp at once | Minor | . |
| [HBASE-19437](https://issues.apache.org/jira/browse/HBASE-19437) | Batch operation can't handle the null result for Append/Increment | Critical | Usability |
| [HBASE-19873](https://issues.apache.org/jira/browse/HBASE-19873) | Add a CategoryBasedTimeout ClassRule for all UTs | Major | . |
| [HBASE-19783](https://issues.apache.org/jira/browse/HBASE-19783) | Change replication peer cluster key/endpoint from a not-null value to null is not allowed | Minor | Replication |
| [HBASE-19483](https://issues.apache.org/jira/browse/HBASE-19483) | Add proper privilege check for rsgroup commands | Major | rsgroup, security |
| [HBASE-19492](https://issues.apache.org/jira/browse/HBASE-19492) | Add EXCLUDE\_NAMESPACE and EXCLUDE\_TABLECFS support to replication peer config | Major | . |
| [HBASE-19357](https://issues.apache.org/jira/browse/HBASE-19357) | Bucket cache no longer L2 for LRU cache | Major | . |
| [HBASE-19359](https://issues.apache.org/jira/browse/HBASE-19359) | Revisit the default config of hbase client retries number | Major | . |
| [HBASE-19092](https://issues.apache.org/jira/browse/HBASE-19092) | Make Tag IA.LimitedPrivate and expose for CPs | Critical | Coprocessors |
| [HBASE-19187](https://issues.apache.org/jira/browse/HBASE-19187) | Remove option to create on heap bucket cache | Minor | regionserver |
| [HBASE-19033](https://issues.apache.org/jira/browse/HBASE-19033) | Allow CP users to change versions and TTL before opening StoreScanner | Blocker | Coprocessors |
| [HBASE-19047](https://issues.apache.org/jira/browse/HBASE-19047) | CP exposed Scanner types should not extend Shipper | Critical | Coprocessors |
| [HBASE-18905](https://issues.apache.org/jira/browse/HBASE-18905) | Allow CPs to request flush on Region and know the completion of the requested flush | Major | Coprocessors |
| [HBASE-18410](https://issues.apache.org/jira/browse/HBASE-18410) | FilterList Improvement. | Major | Filters |
| [HBASE-18893](https://issues.apache.org/jira/browse/HBASE-18893) | Remove Add/Modify/DeleteColumnFamilyProcedure in favor of using ModifyTableProcedure | Major | Coprocessors, master |
| [HBASE-19067](https://issues.apache.org/jira/browse/HBASE-19067) | Do not expose getHDFSBlockDistribution in StoreFile | Major | Coprocessors |
| [HBASE-18989](https://issues.apache.org/jira/browse/HBASE-18989) | Polish the compaction related CP hooks | Major | Compaction, Coprocessors |
| [HBASE-19046](https://issues.apache.org/jira/browse/HBASE-19046) | RegionObserver#postCompactSelection Avoid passing shaded ImmutableList param | Major | Coprocessors |
| [HBASE-19001](https://issues.apache.org/jira/browse/HBASE-19001) | Remove the hooks in RegionObserver which are designed to construct a StoreScanner which is marked as IA.Private | Major | Coprocessors |
| [HBASE-14247](https://issues.apache.org/jira/browse/HBASE-14247) | Separate the old WALs into different regionserver directories | Critical | wal |
| [HBASE-18183](https://issues.apache.org/jira/browse/HBASE-18183) | Region interface cleanup for CP expose | Major | Coprocessors |
| [HBASE-18878](https://issues.apache.org/jira/browse/HBASE-18878) | Use Optional\ return types when T can be null | Major | Coprocessors |
| [HBASE-18649](https://issues.apache.org/jira/browse/HBASE-18649) | Deprecate KV Usage in MR to move to Cells in 3.0 | Major | API, mapreduce |
| [HBASE-18897](https://issues.apache.org/jira/browse/HBASE-18897) | Substitute MemStore for Memstore | Major | . |
| [HBASE-18883](https://issues.apache.org/jira/browse/HBASE-18883) | Upgrade to Curator 4.0 | Major | Client, dependencies |
| [HBASE-18839](https://issues.apache.org/jira/browse/HBASE-18839) | Apply RegionInfo to code base | Major | Coprocessors |
| [HBASE-18826](https://issues.apache.org/jira/browse/HBASE-18826) | Use HStore instead of Store in our own code base and remove unnecessary methods in Store interface | Major | Coprocessors |
| [HBASE-17732](https://issues.apache.org/jira/browse/HBASE-17732) | Coprocessor Design Improvements | Critical | Coprocessors |
| [HBASE-18298](https://issues.apache.org/jira/browse/HBASE-18298) | RegionServerServices Interface cleanup for CP expose | Critical | Coprocessors |
| [HBASE-16769](https://issues.apache.org/jira/browse/HBASE-16769) | Deprecate/remove PB references from MasterObserver and RegionServerObserver | Blocker | . |
| [HBASE-18859](https://issues.apache.org/jira/browse/HBASE-18859) | Purge PB from BulkLoadObserver | Major | Coprocessors |
| [HBASE-18731](https://issues.apache.org/jira/browse/HBASE-18731) | [compat 1-2] Mark protected methods of QuotaSettings that touch Protobuf internals as IA.Private | Major | API |
| [HBASE-18825](https://issues.apache.org/jira/browse/HBASE-18825) | Use HStoreFile instead of StoreFile in our own code base and remove unnecessary methods in StoreFile interface | Major | Coprocessors |
| [HBASE-18142](https://issues.apache.org/jira/browse/HBASE-18142) | Deletion of a cell deletes the previous versions too | Major | API, shell |
| [HBASE-18446](https://issues.apache.org/jira/browse/HBASE-18446) | Mark StoreFileScanner/StoreFileReader as IA.LimitedPrivate(Phoenix) | Critical | Coprocessors |
| [HBASE-18798](https://issues.apache.org/jira/browse/HBASE-18798) | Remove the unused methods in RegionServerObserver | Major | Coprocessors |
| [HBASE-18453](https://issues.apache.org/jira/browse/HBASE-18453) | CompactionRequest should not be exposed to user directly | Major | Coprocessors |
| [HBASE-18794](https://issues.apache.org/jira/browse/HBASE-18794) | Remove deprecated methods in MasterObserver | Major | Coprocessors |
| [HBASE-17823](https://issues.apache.org/jira/browse/HBASE-17823) | Migrate to Apache Yetus Audience Annotations | Major | API |
| [HBASE-18793](https://issues.apache.org/jira/browse/HBASE-18793) | Remove deprecated methods in RegionObserver | Major | Coprocessors |
| [HBASE-18733](https://issues.apache.org/jira/browse/HBASE-18733) | [compat 1-2] Hide WALKey | Major | API |
| [HBASE-16479](https://issues.apache.org/jira/browse/HBASE-16479) | Move WALEdit from hbase.regionserver.wal package to hbase.wal package | Major | wal |
| [HBASE-18783](https://issues.apache.org/jira/browse/HBASE-18783) | Declare the builder of ClusterStatus as IA.Private, and remove the Writables from ClusterStatus | Minor | . |
| [HBASE-18106](https://issues.apache.org/jira/browse/HBASE-18106) | Redo ProcedureInfo and LockInfo | Critical | proc-v2 |
| [HBASE-18780](https://issues.apache.org/jira/browse/HBASE-18780) | Remove HLogPrettyPrinter and hlog command | Minor | documentation, wal |
| [HBASE-18704](https://issues.apache.org/jira/browse/HBASE-18704) | Upgrade hbase to commons-collections 4 | Major | dependencies |
| [HBASE-15607](https://issues.apache.org/jira/browse/HBASE-15607) | Remove PB references from Admin for 2.0 | Blocker | . |
| [HBASE-18736](https://issues.apache.org/jira/browse/HBASE-18736) | Cleanup the HTD/HCD for Admin | Major | . |
| [HBASE-18577](https://issues.apache.org/jira/browse/HBASE-18577) | shaded client includes several non-relocated third party dependencies | Critical | Client |
| [HBASE-3935](https://issues.apache.org/jira/browse/HBASE-3935) | HServerLoad.storefileIndexSizeMB should be changed to storefileIndexSizeKB | Major | . |
| [HBASE-15982](https://issues.apache.org/jira/browse/HBASE-15982) | Interface ReplicationEndpoint extends Guava's Service | Blocker | . |
| [HBASE-18546](https://issues.apache.org/jira/browse/HBASE-18546) | Always overwrite the TS for Append/Increment unless no existing cells are found | Critical | API, Client |
| [HBASE-17442](https://issues.apache.org/jira/browse/HBASE-17442) | Move most of the replication related classes from hbase-client to hbase-replication package | Critical | build, Replication |
| [HBASE-18511](https://issues.apache.org/jira/browse/HBASE-18511) | Default no regions on master | Blocker | master |
| [HBASE-18528](https://issues.apache.org/jira/browse/HBASE-18528) | DON'T allow user to modify the passed table/column descriptor | Critical | Coprocessors, master |
| [HBASE-18469](https://issues.apache.org/jira/browse/HBASE-18469) | Correct RegionServer metric of totalRequestCount | Critical | metrics, regionserver |
| [HBASE-18500](https://issues.apache.org/jira/browse/HBASE-18500) | Performance issue: Don't use BufferedMutator for HTable's put method | Major | . |
| [HBASE-17125](https://issues.apache.org/jira/browse/HBASE-17125) | Inconsistent result when use filter to read data | Critical | . |
| [HBASE-18517](https://issues.apache.org/jira/browse/HBASE-18517) | limit max log message width in log4j | Major | . |
| [HBASE-18502](https://issues.apache.org/jira/browse/HBASE-18502) | Change MasterObserver to use TableDescriptor and ColumnFamilyDescriptor | Critical | Coprocessors, master |
| [HBASE-18374](https://issues.apache.org/jira/browse/HBASE-18374) | RegionServer Metrics improvements | Major | . |
| [HBASE-17908](https://issues.apache.org/jira/browse/HBASE-17908) | Upgrade guava | Critical | dependencies |
| [HBASE-18161](https://issues.apache.org/jira/browse/HBASE-18161) | Incremental Load support for Multiple-Table HFileOutputFormat | Minor | . |
| [HBASE-18267](https://issues.apache.org/jira/browse/HBASE-18267) | The result from the postAppend is ignored | Major | Coprocessors |
| [HBASE-18241](https://issues.apache.org/jira/browse/HBASE-18241) | Change client.Table, client.Admin, Region, Store, and HBaseTestingUtility to not use HTableDescriptor or HColumnDescriptor | Critical | Client |
| [HBASE-18038](https://issues.apache.org/jira/browse/HBASE-18038) | Rename StoreFile to HStoreFile and add a StoreFile interface for CP | Critical | Coprocessors, regionserver |
| [HBASE-16196](https://issues.apache.org/jira/browse/HBASE-16196) | Update jruby to a newer version. | Critical | dependencies, shell |
| [HBASE-14614](https://issues.apache.org/jira/browse/HBASE-14614) | Procedure v2: Core Assignment Manager | Major | proc-v2 |
| [HBASE-3462](https://issues.apache.org/jira/browse/HBASE-3462) | Fix table.jsp in regards to splitting a region/table with an optional splitkey | Major | master |
| [HBASE-11013](https://issues.apache.org/jira/browse/HBASE-11013) | Clone Snapshots on Secure Cluster Should provide option to apply Retained User Permissions | Major | snapshots |
| [HBASE-15296](https://issues.apache.org/jira/browse/HBASE-15296) | Break out writer and reader from StoreFile | Major | regionserver |
| [HBASE-15199](https://issues.apache.org/jira/browse/HBASE-15199) | Move jruby jar so only on hbase-shell module classpath; currently globally available | Critical | dependencies, jruby, shell |
| [HBASE-18009](https://issues.apache.org/jira/browse/HBASE-18009) | Move RpcServer.Call to a separated file | Major | IPC/RPC |
| [HBASE-17956](https://issues.apache.org/jira/browse/HBASE-17956) | Raw scan should ignore TTL | Major | scan |
| [HBASE-17914](https://issues.apache.org/jira/browse/HBASE-17914) | Create a new reader instead of cloning a new StoreFile when compaction | Major | Compaction, regionserver |
| [HBASE-17595](https://issues.apache.org/jira/browse/HBASE-17595) | Add partial result support for small/limited scan | Critical | asyncclient, Client, scan |
| [HBASE-17584](https://issues.apache.org/jira/browse/HBASE-17584) | Expose ScanMetrics with ResultScanner rather than Scan | Major | Client, mapreduce, scan |
| [HBASE-17716](https://issues.apache.org/jira/browse/HBASE-17716) | Formalize Scan Metric names | Minor | metrics |
| [HBASE-17312](https://issues.apache.org/jira/browse/HBASE-17312) | [JDK8] Use default method for Observer Coprocessors | Major | Coprocessors |
| [HBASE-17647](https://issues.apache.org/jira/browse/HBASE-17647) | OffheapKeyValue#heapSize() implementation is wrong | Major | regionserver |
| [HBASE-17472](https://issues.apache.org/jira/browse/HBASE-17472) | Correct the semantic of permission grant | Major | Admin |
| [HBASE-17599](https://issues.apache.org/jira/browse/HBASE-17599) | Use mayHaveMoreCellsInRow instead of isPartial | Major | Client, scan |
| [HBASE-17508](https://issues.apache.org/jira/browse/HBASE-17508) | Unify the implementation of small scan and regular scan for sync client | Major | Client, scan |
| [HBASE-12894](https://issues.apache.org/jira/browse/HBASE-12894) | Upgrade Jetty to 9.2.6 | Critical | REST, UI |
| [HBASE-16786](https://issues.apache.org/jira/browse/HBASE-16786) | Procedure V2 - Move ZK-lock's uses to Procedure framework locks (LockProcedure) | Major | . |
| [HBASE-17470](https://issues.apache.org/jira/browse/HBASE-17470) | Remove merge region code from region server | Major | regionserver |
| [HBASE-5401](https://issues.apache.org/jira/browse/HBASE-5401) | PerformanceEvaluation generates 10x the number of expected mappers | Major | test |
| [HBASE-17221](https://issues.apache.org/jira/browse/HBASE-17221) | Abstract out an interface for RpcServer.Call | Major | . |
| [HBASE-16119](https://issues.apache.org/jira/browse/HBASE-16119) | Procedure v2 - Reimplement merge | Major | proc-v2, Region Assignment |
| [HBASE-17132](https://issues.apache.org/jira/browse/HBASE-17132) | Cleanup deprecated code for WAL | Major | wal |
| [HBASE-17017](https://issues.apache.org/jira/browse/HBASE-17017) | Remove the current per-region latency histogram metrics | Major | metrics |
| [HBASE-15513](https://issues.apache.org/jira/browse/HBASE-15513) | hbase.hregion.memstore.chunkpool.maxsize is 0.0 by default | Major | . |
| [HBASE-16972](https://issues.apache.org/jira/browse/HBASE-16972) | Log more details for Scan#next request when responseTooSlow | Major | Operability |
| [HBASE-16765](https://issues.apache.org/jira/browse/HBASE-16765) | New SteppingRegionSplitPolicy, avoid too aggressive spread of regions for small tables. | Critical | . |
| [HBASE-16747](https://issues.apache.org/jira/browse/HBASE-16747) | Track memstore data size and heap overhead separately | Major | regionserver |
| [HBASE-14551](https://issues.apache.org/jira/browse/HBASE-14551) | Procedure v2 - Reimplement split | Minor | proc-v2 |
| [HBASE-16729](https://issues.apache.org/jira/browse/HBASE-16729) | Define the behavior of (default) empty FilterList | Trivial | . |
| [HBASE-16799](https://issues.apache.org/jira/browse/HBASE-16799) | CP exposed Store should not expose unwanted APIs | Major | . |
| [HBASE-16117](https://issues.apache.org/jira/browse/HBASE-16117) | Fix Connection leak in mapred.TableOutputFormat | Major | mapreduce |
| [HBASE-15638](https://issues.apache.org/jira/browse/HBASE-15638) | Shade protobuf | Critical | Protobufs |
| [HBASE-16257](https://issues.apache.org/jira/browse/HBASE-16257) | Move staging dir to be under hbase root dir | Blocker | . |
| [HBASE-16650](https://issues.apache.org/jira/browse/HBASE-16650) | Wrong usage of BlockCache eviction stat for heap memory tuning | Major | . |
| [HBASE-16598](https://issues.apache.org/jira/browse/HBASE-16598) | Enable zookeeper useMulti always and clean up in HBase code | Major | . |
| [HBASE-15297](https://issues.apache.org/jira/browse/HBASE-15297) | error message is wrong when a wrong namspace is specified in grant in hbase shell | Minor | shell |
| [HBASE-16340](https://issues.apache.org/jira/browse/HBASE-16340) | ensure no Xerces jars included | Critical | dependencies |
| [HBASE-16321](https://issues.apache.org/jira/browse/HBASE-16321) | Ensure findbugs jsr305 jar isn't present | Blocker | dependencies |
| [HBASE-16355](https://issues.apache.org/jira/browse/HBASE-16355) | hbase-client dependency on hbase-common test-jar should be test scope | Major | Client, dependencies |
| [HBASE-16186](https://issues.apache.org/jira/browse/HBASE-16186) | Fix AssignmentManager MBean name | Major | master |
| [HBASE-13823](https://issues.apache.org/jira/browse/HBASE-13823) | Procedure V2: unnecessaery operations on AssignmentManager#recoverTableInDisablingState() and recoverTableInEnablingState() | Major | master, proc-v2 |
| [HBASE-15950](https://issues.apache.org/jira/browse/HBASE-15950) | Fix memstore size estimates to be more tighter | Major | . |
| [HBASE-15971](https://issues.apache.org/jira/browse/HBASE-15971) | Regression: Random Read/WorkloadC slower in 1.x than 0.98 | Critical | rpc |
| [HBASE-15875](https://issues.apache.org/jira/browse/HBASE-15875) | Remove HTable references and HTableInterface | Major | . |
| [HBASE-15610](https://issues.apache.org/jira/browse/HBASE-15610) | Remove deprecated HConnection for 2.0 thus removing all PB references for 2.0 | Blocker | . |
| [HBASE-15876](https://issues.apache.org/jira/browse/HBASE-15876) | Remove doBulkLoad(Path hfofDir, final HTable table) though it has not been through a full deprecation cycle | Blocker | . |
| [HBASE-15575](https://issues.apache.org/jira/browse/HBASE-15575) | Rename table DDL \*Handler methods in MasterObserver to more meaningful names | Minor | Coprocessors |
| [HBASE-15481](https://issues.apache.org/jira/browse/HBASE-15481) | Add pre/post roll to WALObserver | Trivial | . |
| [HBASE-15568](https://issues.apache.org/jira/browse/HBASE-15568) | Procedure V2 - Remove CreateTableHandler in HBase Apache 2.0 release | Major | master, proc-v2 |
| [HBASE-15521](https://issues.apache.org/jira/browse/HBASE-15521) | Procedure V2 - RestoreSnapshot and CloneSnapshot | Major | Client, master, proc-v2 |
| [HBASE-11393](https://issues.apache.org/jira/browse/HBASE-11393) | Replication TableCfs should be a PB object rather than a string | Major | Replication |
| [HBASE-15265](https://issues.apache.org/jira/browse/HBASE-15265) | Implement an asynchronous FSHLog | Major | wal |
| [HBASE-15323](https://issues.apache.org/jira/browse/HBASE-15323) | Hbase Rest CheckAndDeleteAPi should be able to delete more cells | Major | hbase |
| [HBASE-15377](https://issues.apache.org/jira/browse/HBASE-15377) | Per-RS Get metric is time based, per-region metric is size-based | Major | . |
| [HBASE-13963](https://issues.apache.org/jira/browse/HBASE-13963) | avoid leaking jdk.tools | Critical | build, documentation |
| [HBASE-15376](https://issues.apache.org/jira/browse/HBASE-15376) | ScanNext metric is size-based while every other per-operation metric is time based | Major | . |
| [HBASE-15290](https://issues.apache.org/jira/browse/HBASE-15290) | Hbase Rest CheckAndAPI should save other cells along with compared cell | Major | hbase |
| [HBASE-15100](https://issues.apache.org/jira/browse/HBASE-15100) | Master WALProcs still never clean up | Blocker | master, proc-v2 |
| [HBASE-15111](https://issues.apache.org/jira/browse/HBASE-15111) | "hbase version" should write to stdout | Trivial | util |
| [HBASE-14888](https://issues.apache.org/jira/browse/HBASE-14888) | ClusterSchema: Add Namespace Operations | Major | API |
| [HBASE-15018](https://issues.apache.org/jira/browse/HBASE-15018) | Inconsistent way of handling TimeoutException in the rpc client implementations | Major | Client, IPC/RPC |
| [HBASE-14205](https://issues.apache.org/jira/browse/HBASE-14205) | RegionCoprocessorHost System.nanoTime() performance bottleneck | Critical | Coprocessors, Performance, regionserver |
| [HBASE-12751](https://issues.apache.org/jira/browse/HBASE-12751) | Allow RowLock to be reader writer | Major | regionserver |
| [HBASE-13706](https://issues.apache.org/jira/browse/HBASE-13706) | CoprocessorClassLoader should not exempt Hive classes | Minor | Coprocessors |
| [HBASE-13954](https://issues.apache.org/jira/browse/HBASE-13954) | Remove HTableInterface#getRowOrBefore related server side code | Major | API |
| [HBASE-12296](https://issues.apache.org/jira/browse/HBASE-12296) | Filters should work with ByteBufferedCell | Major | regionserver, Scanners |
| [HBASE-14027](https://issues.apache.org/jira/browse/HBASE-14027) | Clean up netty dependencies | Major | build |
| [HBASE-7782](https://issues.apache.org/jira/browse/HBASE-7782) | HBaseTestingUtility.truncateTable() not acting like CLI | Minor | test |
| [HBASE-14047](https://issues.apache.org/jira/browse/HBASE-14047) | Cleanup deprecated APIs from Cell class | Major | Client |
| [HBASE-13849](https://issues.apache.org/jira/browse/HBASE-13849) | Remove restore and clone snapshot from the WebUI | Major | snapshots |
| [HBASE-13646](https://issues.apache.org/jira/browse/HBASE-13646) | HRegion#execService should not try to build incomplete messages | Major | Coprocessors, regionserver |
| [HBASE-13983](https://issues.apache.org/jira/browse/HBASE-13983) | Doc how the oddball HTable methods getStartKey, getEndKey, etc. will be removed in 2.0.0 | Minor | documentation |
| [HBASE-13214](https://issues.apache.org/jira/browse/HBASE-13214) | Remove deprecated and unused methods from HTable class | Major | API |
| [HBASE-13843](https://issues.apache.org/jira/browse/HBASE-13843) | Fix internal constant text in ReplicationManager.java | Trivial | master |
| [HBASE-13375](https://issues.apache.org/jira/browse/HBASE-13375) | Provide HBase superuser higher priority over other users in the RPC handling | Major | IPC/RPC |
| [HBASE-13636](https://issues.apache.org/jira/browse/HBASE-13636) | Remove deprecation for HBASE-4072 (Reading of zoo.cfg) | Major | . |
| [HBASE-10800](https://issues.apache.org/jira/browse/HBASE-10800) | Use CellComparator instead of KVComparator | Major | . |
| [HBASE-13118](https://issues.apache.org/jira/browse/HBASE-13118) | [PE] Add being able to write many columns | Major | test |
| [HBASE-12990](https://issues.apache.org/jira/browse/HBASE-12990) | MetaScanner should be replaced by MetaTableAccessor | Major | Client |
| [HBASE-13373](https://issues.apache.org/jira/browse/HBASE-13373) | Squash HFileReaderV3 together with HFileReaderV2 and AbstractHFileReader; ditto for Scanners and BlockReader, etc. | Major | . |
| [HBASE-10728](https://issues.apache.org/jira/browse/HBASE-10728) | get\_counter value is never used. | Major | . |
| [HBASE-13298](https://issues.apache.org/jira/browse/HBASE-13298) | Clarify if Table.{set\|get}WriteBufferSize() is deprecated or not | Critical | API |
| [HBASE-13248](https://issues.apache.org/jira/browse/HBASE-13248) | Make HConnectionImplementation top-level class. | Major | API |
| [HBASE-13198](https://issues.apache.org/jira/browse/HBASE-13198) | Remove HConnectionManager | Major | API |
| [HBASE-12586](https://issues.apache.org/jira/browse/HBASE-12586) | Task 6 & 7 from HBASE-9117, delete all public HTable constructors and delete ConnectionManager#{delete,get}Connection | Major | . |
| [HBASE-13171](https://issues.apache.org/jira/browse/HBASE-13171) | Change AccessControlClient methods to accept connection object to reduce setup time. | Minor | . |
| [HBASE-6778](https://issues.apache.org/jira/browse/HBASE-6778) | Deprecate Chore; its a thread per task when we should have one thread to do all tasks | Major | . |
| [HBASE-12684](https://issues.apache.org/jira/browse/HBASE-12684) | Add new AsyncRpcClient | Major | Client |
| [HBASE-10378](https://issues.apache.org/jira/browse/HBASE-10378) | Divide HLog interface into User and Implementor specific interfaces | Major | wal |
| [HBASE-12111](https://issues.apache.org/jira/browse/HBASE-12111) | Remove deprecated APIs from Mutation(s) | Major | Client |
| [HBASE-12084](https://issues.apache.org/jira/browse/HBASE-12084) | Remove deprecated APIs from Result | Major | Client |
| [HBASE-12048](https://issues.apache.org/jira/browse/HBASE-12048) | Remove deprecated APIs from Filter | Major | regionserver |
| [HBASE-11556](https://issues.apache.org/jira/browse/HBASE-11556) | Move HTablePool to hbase-thrift module. | Major | Thrift |
| [HBASE-4072](https://issues.apache.org/jira/browse/HBASE-4072) | Deprecate/disable and remove support for reading ZooKeeper zoo.cfg files from the classpath | Major | . |
### IMPORTANT ISSUES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-15780](https://issues.apache.org/jira/browse/HBASE-15780) | Expose AuthUtil as IA.Public | Critical | API, security |
| [HBASE-15322](https://issues.apache.org/jira/browse/HBASE-15322) | Operations using Unsafe path broken for platforms not having sun.misc.Unsafe | Critical | hbase |
| [HBASE-15125](https://issues.apache.org/jira/browse/HBASE-15125) | HBaseFsck's adoptHdfsOrphan function creates region with wrong end key boundary | Major | hbck |
### NEW FEATURES:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19950](https://issues.apache.org/jira/browse/HBASE-19950) | Introduce a ColumnValueFilter | Minor | Filters |
| [HBASE-19844](https://issues.apache.org/jira/browse/HBASE-19844) | Shell should support flush by regionserver | Minor | shell |
| [HBASE-19886](https://issues.apache.org/jira/browse/HBASE-19886) | Display maintenance mode in shell, web UI | Major | . |
| [HBASE-19528](https://issues.apache.org/jira/browse/HBASE-19528) | Major Compaction Tool | Major | . |
| [HBASE-19897](https://issues.apache.org/jira/browse/HBASE-19897) | RowMutations should follow the fluent pattern | Minor | . |
| [HBASE-4224](https://issues.apache.org/jira/browse/HBASE-4224) | Need a flush by regionserver rather than by table option | Major | . |
| [HBASE-15321](https://issues.apache.org/jira/browse/HBASE-15321) | Ability to open a HRegion from hdfs snapshot. | Major | . |
| [HBASE-19799](https://issues.apache.org/jira/browse/HBASE-19799) | Add web UI to rsgroup | Major | rsgroup, UI |
| [HBASE-19326](https://issues.apache.org/jira/browse/HBASE-19326) | Remove decommissioned servers from rsgroup | Major | rsgroup |
| [HBASE-19189](https://issues.apache.org/jira/browse/HBASE-19189) | Ad-hoc test job for running a subset of tests lots of times | Major | build |
| [HBASE-19103](https://issues.apache.org/jira/browse/HBASE-19103) | Add BigDecimalComparator for filter | Minor | Client |
| [HBASE-18171](https://issues.apache.org/jira/browse/HBASE-18171) | Scanning cursor for async client | Major | . |
| [HBASE-18875](https://issues.apache.org/jira/browse/HBASE-18875) | Thrift server supports read-only mode | Major | Thrift |
| [HBASE-14417](https://issues.apache.org/jira/browse/HBASE-14417) | Incremental backup and bulk loading | Blocker | . |
| [HBASE-18131](https://issues.apache.org/jira/browse/HBASE-18131) | Add an hbase shell command to clear deadserver list in ServerManager | Major | Operability |
| [HBASE-15806](https://issues.apache.org/jira/browse/HBASE-15806) | An endpoint-based export tool | Critical | Coprocessors, tooling |
| [HBASE-14135](https://issues.apache.org/jira/browse/HBASE-14135) | HBase Backup/Restore Phase 3: Merge backup images | Critical | . |
| [HBASE-15134](https://issues.apache.org/jira/browse/HBASE-15134) | Add visibility into Flush and Compaction queues | Major | Compaction, metrics, regionserver |
| [HBASE-15968](https://issues.apache.org/jira/browse/HBASE-15968) | New behavior of versions considering mvcc and ts rather than ts only | Major | . |
| [HBASE-15943](https://issues.apache.org/jira/browse/HBASE-15943) | Add page displaying JVM process metrics | Major | Operability, UI |
| [HBASE-17928](https://issues.apache.org/jira/browse/HBASE-17928) | Shell tool to clear compaction queues | Major | Compaction, Operability |
| [HBASE-18226](https://issues.apache.org/jira/browse/HBASE-18226) | Disable reverse DNS lookup at HMaster and use the hostname provided by RegionServer | Major | . |
| [HBASE-13784](https://issues.apache.org/jira/browse/HBASE-13784) | Add Async Client Table API | Major | . |
| [HBASE-17849](https://issues.apache.org/jira/browse/HBASE-17849) | PE tool random read is not totally random | Major | Performance, test |
| [HBASE-15576](https://issues.apache.org/jira/browse/HBASE-15576) | Scanning cursor to prevent blocking long time on ResultScanner.next() | Major | . |
| [HBASE-16961](https://issues.apache.org/jira/browse/HBASE-16961) | FileSystem Quotas | Major | . |
| [HBASE-17757](https://issues.apache.org/jira/browse/HBASE-17757) | Unify blocksize after encoding to decrease memory fragment | Major | . |
| [HBASE-17542](https://issues.apache.org/jira/browse/HBASE-17542) | Move backup system table into separate namespace | Major | . |
| [HBASE-14141](https://issues.apache.org/jira/browse/HBASE-14141) | HBase Backup/Restore Phase 3: Filter WALs on backup to include only edits from backed up tables | Blocker | . |
| [HBASE-17758](https://issues.apache.org/jira/browse/HBASE-17758) | [RSGROUP] Add shell command to move servers and tables at the same time | Major | rsgroup |
| [HBASE-17737](https://issues.apache.org/jira/browse/HBASE-17737) | Thrift2 proxy should support scan timeRange per column family | Major | Thrift |
| [HBASE-16981](https://issues.apache.org/jira/browse/HBASE-16981) | Expand Mob Compaction Partition policy from daily to weekly, monthly | Major | mob |
| [HBASE-9774](https://issues.apache.org/jira/browse/HBASE-9774) | HBase native metrics and metric collection for coprocessors | Major | Coprocessors, metrics |
| [HBASE-17174](https://issues.apache.org/jira/browse/HBASE-17174) | Refactor the AsyncProcess, BufferedMutatorImpl, and HTable | Minor | . |
| [HBASE-15432](https://issues.apache.org/jira/browse/HBASE-15432) | TableInputFormat - support multi column family scan | Major | . |
| [HBASE-17181](https://issues.apache.org/jira/browse/HBASE-17181) | Let HBase thrift2 support TThreadedSelectorServer | Minor | Thrift |
| [HBASE-17151](https://issues.apache.org/jira/browse/HBASE-17151) | New API to create HFile.Reader without instantiating block cache | Major | . |
| [HBASE-16463](https://issues.apache.org/jira/browse/HBASE-16463) | Improve transparent table/CF encryption with Commons Crypto | Major | encryption |
| [HBASE-16751](https://issues.apache.org/jira/browse/HBASE-16751) | Add tuning information to HBase Book | Minor | . |
| [HBASE-16677](https://issues.apache.org/jira/browse/HBASE-16677) | Add table size (total store file size) to table page | Minor | website |
| [HBASE-16447](https://issues.apache.org/jira/browse/HBASE-16447) | Replication by namespaces config in peer | Critical | Replication |
| [HBASE-16388](https://issues.apache.org/jira/browse/HBASE-16388) | Prevent client threads being blocked by only one slow region server | Major | . |
| [HBASE-16213](https://issues.apache.org/jira/browse/HBASE-16213) | A new HFileBlock structure for fast random get | Major | Performance |
| [HBASE-12721](https://issues.apache.org/jira/browse/HBASE-12721) | Create Docker container cluster infrastructure to enable better testing | Major | build, community, documentation, test |
| [HBASE-3727](https://issues.apache.org/jira/browse/HBASE-3727) | MultiHFileOutputFormat | Minor | . |
| [HBASE-15881](https://issues.apache.org/jira/browse/HBASE-15881) | Allow BZIP2 compression | Major | HFile |
| [HBASE-10358](https://issues.apache.org/jira/browse/HBASE-10358) | Shell changes for setting consistency per request | Major | shell |
| [HBASE-15892](https://issues.apache.org/jira/browse/HBASE-15892) | submit-patch.py: Single command line to make patch, upload it to jira, and update review board | Trivial | . |
| [HBASE-15228](https://issues.apache.org/jira/browse/HBASE-15228) | Add the methods to RegionObserver to trigger start/complete restoring WALs | Major | Coprocessors |
| [HBASE-15847](https://issues.apache.org/jira/browse/HBASE-15847) | VerifyReplication prefix filtering | Major | Replication |
| [HBASE-15798](https://issues.apache.org/jira/browse/HBASE-15798) | Add Async RpcChannels to all RpcClients | Major | . |
| [HBASE-15281](https://issues.apache.org/jira/browse/HBASE-15281) | Allow the FileSystem inside HFileSystem to be wrapped | Major | Filesystem Integration, hbase |
| [HBASE-15592](https://issues.apache.org/jira/browse/HBASE-15592) | Print Procedure WAL content | Major | . |
| [HBASE-6721](https://issues.apache.org/jira/browse/HBASE-6721) | RegionServer Group based Assignment | Major | regionserver |
| [HBASE-15136](https://issues.apache.org/jira/browse/HBASE-15136) | Explore different queuing behaviors while busy | Critical | IPC/RPC |
| [HBASE-15181](https://issues.apache.org/jira/browse/HBASE-15181) | A simple implementation of date based tiered compaction | Major | Compaction |
| [HBASE-13259](https://issues.apache.org/jira/browse/HBASE-13259) | mmap() based BucketCache IOEngine | Critical | BlockCache |
| [HBASE-15135](https://issues.apache.org/jira/browse/HBASE-15135) | Add metrics for storefile age | Major | . |
| [HBASE-14355](https://issues.apache.org/jira/browse/HBASE-14355) | Scan different TimeRange for each column family | Major | Client, regionserver, Scanners |
| [HBASE-11262](https://issues.apache.org/jira/browse/HBASE-11262) | Avoid empty columns while doing bulk-load | Major | . |
| [HBASE-15036](https://issues.apache.org/jira/browse/HBASE-15036) | Update HBase Spark documentation to include bulk load with thin records | Major | . |
| [HBASE-14980](https://issues.apache.org/jira/browse/HBASE-14980) | Project Astro | Major | documentation |
| [HBASE-13153](https://issues.apache.org/jira/browse/HBASE-13153) | Bulk Loaded HFile Replication | Major | Replication |
| [HBASE-12911](https://issues.apache.org/jira/browse/HBASE-12911) | Client-side metrics | Major | Client, Operability, Performance |
| [HBASE-14529](https://issues.apache.org/jira/browse/HBASE-14529) | Respond to SIGHUP to reload config | Major | Operability |
| [HBASE-14459](https://issues.apache.org/jira/browse/HBASE-14459) | Add request and response sizes metrics | Major | metrics |
| [HBASE-14456](https://issues.apache.org/jira/browse/HBASE-14456) | Implement a namespace-based region grouping strategy for RegionGroupingProvider | Major | . |
| [HBASE-14154](https://issues.apache.org/jira/browse/HBASE-14154) | DFS Replication should be configurable at column family level | Minor | . |
| [HBASE-13702](https://issues.apache.org/jira/browse/HBASE-13702) | ImportTsv: Add dry-run functionality and log bad rows | Major | . |
| [HBASE-13639](https://issues.apache.org/jira/browse/HBASE-13639) | SyncTable - rsync for HBase tables | Major | mapreduce, Operability, tooling |
| [HBASE-10070](https://issues.apache.org/jira/browse/HBASE-10070) | HBase read high-availability using timeline-consistent region replicas | Major | Admin, API, LatencyResilience |
| [HBASE-13356](https://issues.apache.org/jira/browse/HBASE-13356) | HBase should provide an InputFormat supporting multiple scans in mapreduce jobs over snapshots | Minor | mapreduce |
| [HBASE-5980](https://issues.apache.org/jira/browse/HBASE-5980) | Scanner responses from RS should include metrics on rows/KVs filtered | Minor | Client, metrics, Operability, regionserver |
| [HBASE-13698](https://issues.apache.org/jira/browse/HBASE-13698) | Add RegionLocator methods to Thrift2 proxy. | Major | Thrift |
| [HBASE-13071](https://issues.apache.org/jira/browse/HBASE-13071) | Hbase Streaming Scan Feature | Major | . |
| [HBASE-13090](https://issues.apache.org/jira/browse/HBASE-13090) | Progress heartbeats for long running scanners | Major | . |
| [HBASE-13412](https://issues.apache.org/jira/browse/HBASE-13412) | Region split decisions should have jitter | Major | regionserver |
| [HBASE-12972](https://issues.apache.org/jira/browse/HBASE-12972) | Region, a supportable public/evolving subset of HRegion | Major | . |
| [HBASE-13170](https://issues.apache.org/jira/browse/HBASE-13170) | Allow block cache to be external | Major | io |
| [HBASE-5238](https://issues.apache.org/jira/browse/HBASE-5238) | Add a log4j category for all edits to META/ROOT | Minor | regionserver |
| [HBASE-13063](https://issues.apache.org/jira/browse/HBASE-13063) | Allow to turn off memstore replication for region replicas | Minor | regionserver, Replication |
| [HBASE-13057](https://issues.apache.org/jira/browse/HBASE-13057) | Provide client utility to easily enable and disable table replication | Major | Replication |
| [HBASE-12869](https://issues.apache.org/jira/browse/HBASE-12869) | Add a REST API implementation of the ClusterManager interface | Major | integration tests |
| [HBASE-12944](https://issues.apache.org/jira/browse/HBASE-12944) | Support patches to branches in precommit jenkins build | Major | . |
| [HBASE-12268](https://issues.apache.org/jira/browse/HBASE-12268) | Add support for Scan.setRowPrefixFilter to shell | Major | shell |
| [HBASE-5162](https://issues.apache.org/jira/browse/HBASE-5162) | Basic client pushback mechanism | Major | . |
### IMPROVEMENTS:
| JIRA | Summary | Priority | Component |
|:---- |:---- | :--- |:---- |
| [HBASE-19994](https://issues.apache.org/jira/browse/HBASE-19994) | Create a new class for RPC throttling exception, make it retryable. | Major | . |
| [HBASE-20409](https://issues.apache.org/jira/browse/HBASE-20409) | Set hbase.client.meta.operation.timeout in TestClientOperationTimeout | Trivial | test |
| [HBASE-17449](https://issues.apache.org/jira/browse/HBASE-17449) | Add explicit document on different timeout settings | Critical | documentation |
| [HBASE-18784](https://issues.apache.org/jira/browse/HBASE-18784) | Use of filesystem that requires hflush / hsync / append / etc should query outputstream capabilities | Major | Filesystem Integration |
| [HBASE-15466](https://issues.apache.org/jira/browse/HBASE-15466) | precommit should not run all java goals when given a docs-only patch | Major | build |
| [HBASE-20135](https://issues.apache.org/jira/browse/HBASE-20135) | NullPointerException during reading bloom filter when upgraded from hbase-1 to hbase-2 | Minor | . |
| [HBASE-17165](https://issues.apache.org/jira/browse/HBASE-17165) | Add retry to LoadIncrementalHFiles tool | Critical | hbase, HFile, tooling |
| [HBASE-18467](https://issues.apache.org/jira/browse/HBASE-18467) | nightly job needs to run all stages and then comment on jira | Critical | community, test |
| [HBASE-17448](https://issues.apache.org/jira/browse/HBASE-17448) | Export metrics from RecoverableZooKeeper | Major | Zookeeper |
| [HBASE-20055](https://issues.apache.org/jira/browse/HBASE-20055) | Remove declaration of un-thrown exceptions and unused setRegionStateBackToOpen() from MergeTableRegionsProcedure | Minor | amv2 |
| [HBASE-18020](https://issues.apache.org/jira/browse/HBASE-18020) | Update API Compliance Checker to Incorporate Improvements Done in Hadoop | Major | API, community |
| [HBASE-20065](https://issues.apache.org/jira/browse/HBASE-20065) | Revisit the timestamp usage in MetaTableAccessor | Major | . |
| [HBASE-18294](https://issues.apache.org/jira/browse/HBASE-18294) | Reduce global heap pressure: flush based on heap occupancy | Major | . |
| [HBASE-19680](https://issues.apache.org/jira/browse/HBASE-19680) | BufferedMutatorImpl#mutate should wait the result from AP in order to throw the failed mutations | Major | . |
| [HBASE-19988](https://issues.apache.org/jira/browse/HBASE-19988) | HRegion#lockRowsAndBuildMiniBatch() is too chatty when interrupted while waiting for a row lock | Minor | amv2 |
| [HBASE-19915](https://issues.apache.org/jira/browse/HBASE-19915) | From split/ merge procedures daughter/ merged regions get created in OFFLINE state | Major | . |
| [HBASE-19917](https://issues.apache.org/jira/browse/HBASE-19917) | Improve RSGroupBasedLoadBalancer#filterServers() to be more efficient | Minor | rsgroup |
| [HBASE-19904](https://issues.apache.org/jira/browse/HBASE-19904) | Break dependency of WAL constructor on Replication | Major | Replication, wal |
| [HBASE-19912](https://issues.apache.org/jira/browse/HBASE-19912) | The flag "writeToWAL" of Region#checkAndRowMutate is useless | Minor | . |
| [HBASE-19861](https://issues.apache.org/jira/browse/HBASE-19861) | Avoid using RPCs when querying table infos for master status pages | Major | UI |
| [HBASE-19770](https://issues.apache.org/jira/browse/HBASE-19770) | Add '--return-values' option to Shell to print return values of commands in interactive mode | Critical | shell |
| [HBASE-19823](https://issues.apache.org/jira/browse/HBASE-19823) | Make RawCellBuilderFactory LimitedPrivate.UNITTEST | Minor | . |
| [HBASE-19820](https://issues.apache.org/jira/browse/HBASE-19820) | Restore public constructor of MiniHBaseCluster (API compat) | Major | . |
| [HBASE-19736](https://issues.apache.org/jira/browse/HBASE-19736) | Remove BaseLogCleanerDelegate deprecated #isLogDeletable(FileStatus) and use #isFileDeletable(FileStatus) instead | Minor | . |
| [HBASE-19739](https://issues.apache.org/jira/browse/HBASE-19739) | Include thrift IDL files in HBase binary distribution | Minor | Thrift |
| [HBASE-19789](https://issues.apache.org/jira/browse/HBASE-19789) | Not exclude flaky tests from nightly builds | Major | . |
| [HBASE-19758](https://issues.apache.org/jira/browse/HBASE-19758) | Split TestHCM to several smaller tests | Major | test |
| [HBASE-19751](https://issues.apache.org/jira/browse/HBASE-19751) | Use RegionInfo directly instead of an identifier and a namespace when getting WAL | Major | wal |
| [HBASE-19139](https://issues.apache.org/jira/browse/HBASE-19139) | Create Async Admin methods for Clear Block Cache | Major | Admin |
| [HBASE-19702](https://issues.apache.org/jira/browse/HBASE-19702) | Improve RSGroupInfo constructors | Minor | . |
| [HBASE-19684](https://issues.apache.org/jira/browse/HBASE-19684) | BlockCacheKey toString Performance | Trivial | hbase |
| [HBASE-19358](https://issues.apache.org/jira/browse/HBASE-19358) | Improve the stability of splitting log when do fail over | Major | MTTR |
| [HBASE-19723](https://issues.apache.org/jira/browse/HBASE-19723) | hbase-thrift declares slf4j-api twice | Trivial | Thrift |
| [HBASE-19651](https://issues.apache.org/jira/browse/HBASE-19651) | Remove LimitInputStream | Minor | hbase |
| [HBASE-19473](https://issues.apache.org/jira/browse/HBASE-19473) | Miscellaneous changes to ClientScanner | Trivial | hbase |
| [HBASE-19613](https://issues.apache.org/jira/browse/HBASE-19613) | Miscellaneous changes to WALSplitter | Trivial | hbase |
| [HBASE-18806](https://issues.apache.org/jira/browse/HBASE-18806) | VerifyRep by snapshot need not to restore snapshot for each mapper | Major | Replication |
| [HBASE-18011](https://issues.apache.org/jira/browse/HBASE-18011) | Refactor RpcServer | Major | IPC/RPC |
| [HBASE-19641](https://issues.apache.org/jira/browse/HBASE-19641) | AsyncHBaseAdmin should use exponential backoff when polling the procedure result | Major | asyncclient, proc-v2 |
| [HBASE-19675](https://issues.apache.org/jira/browse/HBASE-19675) | Miscellaneous HStore Class Improvements | Minor | hbase |
| [HBASE-19683](https://issues.apache.org/jira/browse/HBASE-19683) | Remove Superfluous Methods From String Class | Trivial | hbase |
| [HBASE-19676](https://issues.apache.org/jira/browse/HBASE-19676) | CleanerChore logging improvements | Trivial | hbase |
| [HBASE-19486](https://issues.apache.org/jira/browse/HBASE-19486) | Periodically ensure records are not buffered too long by BufferedMutator | Major | Client |
| [HBASE-19679](https://issues.apache.org/jira/browse/HBASE-19679) | Superusers Logging and Data Structures | Trivial | hbase |
| [HBASE-19677](https://issues.apache.org/jira/browse/HBASE-19677) | Miscellaneous HFileCleaner Improvements | Trivial | hbase |
| [HBASE-19649](https://issues.apache.org/jira/browse/HBASE-19649) | Use singleton feature for ImmutableSegment | Trivial | . |
| [HBASE-8518](https://issues.apache.org/jira/browse/HBASE-8518) | Get rid of hbase.hstore.compaction.complete setting | Minor | . |
| [HBASE-19659](https://issues.apache.org/jira/browse/HBASE-19659) | Enable -x in make\_rc.sh so logs where it is in execution | Trivial | build |
| [HBASE-19647](https://issues.apache.org/jira/browse/HBASE-19647) | Logging cleanups; emit regionname when RegionTooBusyException inside RetriesExhausted... make netty connect/disconnect TRACE-level | Major | . |
| [HBASE-19545](https://issues.apache.org/jira/browse/HBASE-19545) | Replace getBytes(StandardCharsets.UTF\_8) with Bytes.toBytes | Minor | . |
| [HBASE-19615](https://issues.apache.org/jira/browse/HBASE-19615) | CompositeImmutableSegment ArrayList Instead of LinkedList | Trivial | hbase |
| [HBASE-19621](https://issues.apache.org/jira/browse/HBASE-19621) | Revisit the methods in ReplicationPeerConfigBuilder | Minor | . |
| [HBASE-19618](https://issues.apache.org/jira/browse/HBASE-19618) | Remove replicationQueuesClient.class/replicationQueues.class config and remove table based ReplicationQueuesClient/ReplicationQueues implementation | Major | . |
| [HBASE-19576](https://issues.apache.org/jira/browse/HBASE-19576) | Introduce builder for ReplicationPeerConfig and make it immutable | Major | . |
| [HBASE-19590](https://issues.apache.org/jira/browse/HBASE-19590) | Remove the duplicate code in deprecated ReplicationAdmin | Minor | . |
| [HBASE-19570](https://issues.apache.org/jira/browse/HBASE-19570) | Add hadoop3 tests to Nightly master/branch-2 runs | Critical | . |
| [HBASE-19571](https://issues.apache.org/jira/browse/HBASE-19571) | Minor refactor of Nightly run scripts | Minor | . |
| [HBASE-19491](https://issues.apache.org/jira/browse/HBASE-19491) | Exclude flaky tests from nightly master run | Major | . |
| [HBASE-15482](https://issues.apache.org/jira/browse/HBASE-15482) | Provide an option to skip calculating block locations for SnapshotInputFormat | Minor | mapreduce |
| [HBASE-19531](https://issues.apache.org/jira/browse/HBASE-19531) | Remove needless volatile declaration | Trivial | . |
| [HBASE-19521](https://issues.apache.org/jira/browse/HBASE-19521) | HBase mob compaction need to check hfile version | Critical | Compaction, mob |
| [HBASE-14790](https://issues.apache.org/jira/browse/HBASE-14790) | Implement a new DFSOutputStream for logging WAL only | Major | wal |
| [HBASE-19472](https://issues.apache.org/jira/browse/HBASE-19472) | Remove ArrayUtil Class | Major | hbase |
| [HBASE-19489](https://issues.apache.org/jira/browse/HBASE-19489) | Check against only the latest maintenance release in pre-commit hadoopcheck. | Minor | . |
| [HBASE-17425](https://issues.apache.org/jira/browse/HBASE-17425) | Fix calls to deprecated APIs in TestUpdateConfiguration | Trivial | Client |
| [HBASE-19464](https://issues.apache.org/jira/browse/HBASE-19464) | Replace StringBuffer with StringBuilder for hbase-common | Trivial | hbase |
| [HBASE-19463](https://issues.apache.org/jira/browse/HBASE-19463) | Make CPEnv#getConnection return a facade that throws Unsupported if CP calls #close | Major | Coprocessors |
| [HBASE-19180](https://issues.apache.org/jira/browse/HBASE-19180) | Remove unused imports from AlwaysPasses | Trivial | build |
| [HBASE-18169](https://issues.apache.org/jira/browse/HBASE-18169) | Coprocessor fix and cleanup before 2.0.0 release | Blocker | Coprocessors |
| [HBASE-19448](https://issues.apache.org/jira/browse/HBASE-19448) | Replace StringBuffer with StringBuilder for hbase-server | Trivial | hbase |
| [HBASE-19432](https://issues.apache.org/jira/browse/HBASE-19432) | Roll the specified writer in HFileOutputFormat2 | Major | . |
| [HBASE-19290](https://issues.apache.org/jira/browse/HBASE-19290) | Reduce zk request when doing split log | Major | . |
| [HBASE-19336](https://issues.apache.org/jira/browse/HBASE-19336) | Improve rsgroup to allow assign all tables within a specified namespace by only writing namespace | Major | rsgroup |
| [HBASE-19367](https://issues.apache.org/jira/browse/HBASE-19367) | Refactoring in RegionStates, and RSProcedureDispatcher | Minor | . |
| [HBASE-19382](https://issues.apache.org/jira/browse/HBASE-19382) | Update report-flakies.py script to handle yetus builds | Major | . |
| [HBASE-19252](https://issues.apache.org/jira/browse/HBASE-19252) | Move the transform logic of FilterList into transformCell() method to avoid extra ref to question cell | Minor | . |
| [HBASE-19372](https://issues.apache.org/jira/browse/HBASE-19372) | Remove the Span object in SyncFuture as it is useless now | Major | tracing, wal |
| [HBASE-18090](https://issues.apache.org/jira/browse/HBASE-18090) | Improve TableSnapshotInputFormat to allow more multiple mappers per region | Major | mapreduce |
| [HBASE-16868](https://issues.apache.org/jira/browse/HBASE-16868) | Add a replicate\_all flag to avoid misuse the namespaces and table-cfs config of replication peer | Critical | Replication |
| [HBASE-19311](https://issues.apache.org/jira/browse/HBASE-19311) | Promote TestAcidGuarantees to LargeTests and start mini cluster once to make it faster | Major | test |
| [HBASE-19293](https://issues.apache.org/jira/browse/HBASE-19293) | Support adding a new replication peer in disabled state | Major | . |
| [HBASE-16574](https://issues.apache.org/jira/browse/HBASE-16574) | Add backup / restore feature to refguide | Major | . |
| [HBASE-19274](https://issues.apache.org/jira/browse/HBASE-19274) | Log IOException when unable to determine the size of committed file | Trivial | . |
| [HBASE-19251](https://issues.apache.org/jira/browse/HBASE-19251) | Merge RawAsyncTable and AsyncTable | Major | asyncclient, Client |
| [HBASE-19262](https://issues.apache.org/jira/browse/HBASE-19262) | Revisit checkstyle rules | Major | build |
| [HBASE-18601](https://issues.apache.org/jira/browse/HBASE-18601) | Update Htrace to 4.2 | Major | dependencies, tracing |
| [HBASE-19227](https://issues.apache.org/jira/browse/HBASE-19227) | Nightly jobs should archive JVM dumpstream files | Critical | build |
| [HBASE-12350](https://issues.apache.org/jira/browse/HBASE-12350) | Backport error-prone build support to branch-1 and branch-2 | Minor | . |
| [HBASE-19228](https://issues.apache.org/jira/browse/HBASE-19228) | nightly job should gather machine stats. | Major | build |
| [HBASE-19186](https://issues.apache.org/jira/browse/HBASE-19186) | Unify to use bytes to show size in master/rs ui | Minor | . |
| [HBASE-19027](https://issues.apache.org/jira/browse/HBASE-19027) | Honor the CellComparator of ScanInfo in scanning over a store | Major | . |
| [HBASE-13622](https://issues.apache.org/jira/browse/HBASE-13622) | document upgrade rollback | Major | documentation |
| [HBASE-18925](https://issues.apache.org/jira/browse/HBASE-18925) | Need updated mockito for using java optional | Major | . |
| [HBASE-19140](https://issues.apache.org/jira/browse/HBASE-19140) | hbase-cleanup.sh uses deprecated call to remove files in hdfs | Trivial | scripts |
| [HBASE-17065](https://issues.apache.org/jira/browse/HBASE-17065) | Perform more effective sorting for RPC Handler Tasks | Minor | . |
| [HBASE-18870](https://issues.apache.org/jira/browse/HBASE-18870) | Hbase Backup should set the details to MR job name | Minor | . |
| [HBASE-18602](https://issues.apache.org/jira/browse/HBASE-18602) | rsgroup cleanup unassign code | Minor | rsgroup |
| [HBASE-19110](https://issues.apache.org/jira/browse/HBASE-19110) | Add default for Server#isStopping & #getFileSystem | Minor | . |
| [HBASE-19091](https://issues.apache.org/jira/browse/HBASE-19091) | Code annotation wrote "BinaryComparator" instead of "LongComparator" | Minor | Client |
| [HBASE-18994](https://issues.apache.org/jira/browse/HBASE-18994) | Decide if META/System tables should use Compacting Memstore or Default Memstore | Major | . |
| [HBASE-19051](https://issues.apache.org/jira/browse/HBASE-19051) | Add new split algorithm for num string | Minor | . |
| [HBASE-18824](https://issues.apache.org/jira/browse/HBASE-18824) | Add meaningful comment to HConstants.LATEST\_TIMESTAMP to explain why it is MAX\_VALUE | Minor | . |
| [HBASE-10367](https://issues.apache.org/jira/browse/HBASE-10367) | RegionServer graceful stop / decommissioning | Major | . |
| [HBASE-18986](https://issues.apache.org/jira/browse/HBASE-18986) | Remove unnecessary null check after CellUtil.cloneQualifier() | Minor | . |
| [HBASE-15410](https://issues.apache.org/jira/browse/HBASE-15410) | Utilize the max seek value when all Filters in MUST\_PASS\_ALL FilterList return SEEK\_NEXT\_USING\_HINT | Major | . |
| [HBASE-18843](https://issues.apache.org/jira/browse/HBASE-18843) | Add DistCp support to incremental backup with bulk loading | Major | . |
| [HBASE-16010](https://issues.apache.org/jira/browse/HBASE-16010) | Put draining function through Admin API | Minor | . |
| [HBASE-18899](https://issues.apache.org/jira/browse/HBASE-18899) | Make Fileinfo more readable in HFilePrettyPrinter | Major | HFile |
| [HBASE-16894](https://issues.apache.org/jira/browse/HBASE-16894) | Create more than 1 split per region, generalize HBASE-12590 | Major | . |
| [HBASE-18929](https://issues.apache.org/jira/browse/HBASE-18929) | Hbase backup command doesn’t show debug option to enable backup in debug mode | Minor | . |
| [HBASE-18814](https://issues.apache.org/jira/browse/HBASE-18814) | Make ScanMetrics enabled and add counter \ into the MapReduce Job over snapshot | Minor | mapreduce |
| [HBASE-18559](https://issues.apache.org/jira/browse/HBASE-18559) | Add histogram to MetricsConnection to track concurrent calls per server | Minor | Client |
| [HBASE-18436](https://issues.apache.org/jira/browse/HBASE-18436) | Add client-side hedged read metrics | Minor | . |
| [HBASE-13844](https://issues.apache.org/jira/browse/HBASE-13844) | Move static helper methods from KeyValue into CellUtils | Minor | . |
| [HBASE-18884](https://issues.apache.org/jira/browse/HBASE-18884) | Coprocessor Design Improvements follow up of HBASE-17732 | Major | Coprocessors |
| [HBASE-18652](https://issues.apache.org/jira/browse/HBASE-18652) | Expose individual cache stats in a CombinedCache through JMX | Major | regionserver |
| [HBASE-18651](https://issues.apache.org/jira/browse/HBASE-18651) | Let ChaosMonkeyRunner expose the chaos monkey runner it creates | Major | . |
| [HBASE-11462](https://issues.apache.org/jira/browse/HBASE-11462) | MetaTableAccessor shouldn't use ZooKeeeper | Major | Client, Zookeeper |
| [HBASE-18478](https://issues.apache.org/jira/browse/HBASE-18478) | Allow users to remove RegionFinder from LoadBalancer calculations if no locality possible | Major | Balancer |
| [HBASE-18849](https://issues.apache.org/jira/browse/HBASE-18849) | expand "thirdparty" reference to give examples of setting netty location in common testing modules | Critical | documentation, thirdparty |
| [HBASE-18609](https://issues.apache.org/jira/browse/HBASE-18609) | Apply ClusterStatus#getClusterStatus(EnumSet\) in code base | Major | . |
| [HBASE-18795](https://issues.apache.org/jira/browse/HBASE-18795) | Expose KeyValue.getBuffer() for tests alone | Major | . |
| [HBASE-18772](https://issues.apache.org/jira/browse/HBASE-18772) | [JDK8] Replace AtomicLong with LongAdder | Trivial | . |
| [HBASE-14996](https://issues.apache.org/jira/browse/HBASE-14996) | Some more API cleanup for 2.0 | Blocker | . |
| [HBASE-18683](https://issues.apache.org/jira/browse/HBASE-18683) | Upgrade hbase to commons-math 3 | Major | . |
| [HBASE-13271](https://issues.apache.org/jira/browse/HBASE-13271) | Table#puts(List\) operation is indeterminate; needs fixing | Critical | API |
| [HBASE-10240](https://issues.apache.org/jira/browse/HBASE-10240) | Remove 0.94-\>0.96 migration code | Critical | . |
| [HBASE-18662](https://issues.apache.org/jira/browse/HBASE-18662) | The default values for many configuration items in the code are not consistent with hbase-default.xml | Minor | . |
| [HBASE-18621](https://issues.apache.org/jira/browse/HBASE-18621) | Refactor ClusterOptions before applying to code base | Major | . |
| [HBASE-18778](https://issues.apache.org/jira/browse/HBASE-18778) | Use Comparator for StealJobQueue | Major | Compaction |
| [HBASE-18737](https://issues.apache.org/jira/browse/HBASE-18737) | Display configured max size of memstore and cache on RS UI | Minor | . |
| [HBASE-18674](https://issues.apache.org/jira/browse/HBASE-18674) | upgrade hbase to commons-lang3 | Major | . |
| [HBASE-18746](https://issues.apache.org/jira/browse/HBASE-18746) | Throw exception with job.getStatus().getFailureInfo() when ExportSnapshot fails | Minor | mapreduce, snapshots |
| [HBASE-18740](https://issues.apache.org/jira/browse/HBASE-18740) | Upgrade Zookeeper version to 3.4.10 | Major | . |
| [HBASE-18699](https://issues.apache.org/jira/browse/HBASE-18699) | Copy LoadIncrementalHFiles to another package and mark the old one as deprecated | Major | mapreduce |
| [HBASE-18675](https://issues.apache.org/jira/browse/HBASE-18675) | Making {max,min}SessionTimeout configurable for MiniZooKeeperCluster | Minor | test, Zookeeper |
| [HBASE-17826](https://issues.apache.org/jira/browse/HBASE-17826) | Backup: submit M/R job to a particular Yarn queue | Major | . |
| [HBASE-18677](https://issues.apache.org/jira/browse/HBASE-18677) | typo in namespace docs | Trivial | documentation |
| [HBASE-18701](https://issues.apache.org/jira/browse/HBASE-18701) | Optimize reference guide to use cell acl conveniently | Trivial | . |
| [HBASE-18519](https://issues.apache.org/jira/browse/HBASE-18519) | Use builder pattern to create cell | Major | . |
| [HBASE-18673](https://issues.apache.org/jira/browse/HBASE-18673) | Some more unwanted reference to unshaded PB classes | Minor | . |
| [HBASE-18224](https://issues.apache.org/jira/browse/HBASE-18224) | Upgrade jetty | Critical | dependencies |
| [HBASE-18532](https://issues.apache.org/jira/browse/HBASE-18532) | Improve cache related stats rendered on RS UI | Major | regionserver, UI |
| [HBASE-18629](https://issues.apache.org/jira/browse/HBASE-18629) | Enhance ChaosMonkeyRunner with interruptibility | Major | . |
| [HBASE-18631](https://issues.apache.org/jira/browse/HBASE-18631) | Allow configuration of ChaosMonkey properties via hbase-site | Minor | integration tests |
| [HBASE-18573](https://issues.apache.org/jira/browse/HBASE-18573) | Update Append and Delete to use Mutation#getCellList(family) | Minor | . |
| [HBASE-18251](https://issues.apache.org/jira/browse/HBASE-18251) | Remove unnecessary traversing to the first and last keys in the CellSet | Major | . |
| [HBASE-18581](https://issues.apache.org/jira/browse/HBASE-18581) | Remove dead code and some tidy up in BaseLoadBalancer | Minor | Balancer |
| [HBASE-18504](https://issues.apache.org/jira/browse/HBASE-18504) | Add documentation for WAL compression | Minor | documentation |
| [HBASE-17064](https://issues.apache.org/jira/browse/HBASE-17064) | Add TaskMonitor#getTasks() variant which accepts type selection | Minor | . |
| [HBASE-2631](https://issues.apache.org/jira/browse/HBASE-2631) | Decide between "InMB" and "MB" as suffix for field names in ClusterStatus objects | Minor | . |
| [HBASE-18533](https://issues.apache.org/jira/browse/HBASE-18533) | Expose BucketCache values to be configured | Major | BucketCache |
| [HBASE-18303](https://issues.apache.org/jira/browse/HBASE-18303) | Clean up some parameterized test declarations | Minor | test |
| [HBASE-18522](https://issues.apache.org/jira/browse/HBASE-18522) | Add RowMutations support to Batch | Major | . |
| [HBASE-18566](https://issues.apache.org/jira/browse/HBASE-18566) | [RSGROUP]Log the client IP/port of the rsgroup admin | Major | rsgroup |
| [HBASE-15511](https://issues.apache.org/jira/browse/HBASE-15511) | ClusterStatus should be able to return responses by scope | Major | . |
| [HBASE-18555](https://issues.apache.org/jira/browse/HBASE-18555) | Remove redundant familyMap.put() from addxxx() of sub-classes of Mutation and Query | Minor | Client |
| [HBASE-18387](https://issues.apache.org/jira/browse/HBASE-18387) | [Thrift] Make principal configurable in DemoClient.java | Minor | . |
| [HBASE-18548](https://issues.apache.org/jira/browse/HBASE-18548) | Move sources of important Jenkins jobs into source control | Critical | documentation, scripts |
| [HBASE-18248](https://issues.apache.org/jira/browse/HBASE-18248) | Warn if monitored RPC task has been tied up beyond a configurable threshold | Major | . |
| [HBASE-18485](https://issues.apache.org/jira/browse/HBASE-18485) | Performance issue: ClientAsyncPrefetchScanner is slower than ClientSimpleScanner | Major | . |
| [HBASE-18426](https://issues.apache.org/jira/browse/HBASE-18426) | nightly job should use independent stages to check supported jdks | Critical | community, test |
| [HBASE-14220](https://issues.apache.org/jira/browse/HBASE-14220) | nightly tests should verify src tgz generates and builds correctly | Minor | build |
| [HBASE-18520](https://issues.apache.org/jira/browse/HBASE-18520) | Add jmx value to determine true Master Start time | Minor | metrics |
| [HBASE-16893](https://issues.apache.org/jira/browse/HBASE-16893) | Use Collection.removeIf instead of Iterator.remove in DependentColumnFilter | Minor | . |
| [HBASE-16116](https://issues.apache.org/jira/browse/HBASE-16116) | Remove redundant pattern \*.iml | Trivial | . |
| [HBASE-18261](https://issues.apache.org/jira/browse/HBASE-18261) | [AMv2] Create new RecoverMetaProcedure and use it from ServerCrashProcedure and HMaster.finishActiveMasterInitialization() | Major | amv2 |
| [HBASE-18402](https://issues.apache.org/jira/browse/HBASE-18402) | Thrift2 should support DeleteFamilyVersion type | Major | Thrift |
| [HBASE-18434](https://issues.apache.org/jira/browse/HBASE-18434) | Address some alerts raised by lgtm.com | Major | . |
| [HBASE-18023](https://issues.apache.org/jira/browse/HBASE-18023) | Log multi-\* requests for more than threshold number of rows | Minor | regionserver |
| [HBASE-15816](https://issues.apache.org/jira/browse/HBASE-15816) | Provide client with ability to set priority on Operations | Major | . |
| [HBASE-18389](https://issues.apache.org/jira/browse/HBASE-18389) | Remove byte[] from formal parameter of sizeOf() of ClassSize, ClassSize.MemoryLayout and ClassSize.UnsafeLayout | Minor | util |
| [HBASE-18412](https://issues.apache.org/jira/browse/HBASE-18412) | [Shell] Support unset of list of configuration for a table | Minor | . |
| [HBASE-16312](https://issues.apache.org/jira/browse/HBASE-16312) | update jquery version | Critical | dependencies, UI |
| [HBASE-18332](https://issues.apache.org/jira/browse/HBASE-18332) | Upgrade asciidoctor-maven-plugin | Minor | website |
| [HBASE-18339](https://issues.apache.org/jira/browse/HBASE-18339) | Update test-patch to use hadoop 3.0.0-alpha4 | Major | test |
| [HBASE-18004](https://issues.apache.org/jira/browse/HBASE-18004) | getRegionLocations needs to be called once in ScannerCallableWithReplicas#call() | Minor | Client |
| [HBASE-18307](https://issues.apache.org/jira/browse/HBASE-18307) | Share the same EventLoopGroup for NettyRpcServer, NettyRpcClient and AsyncFSWALProvider at RS side | Major | io, rpc, wal |
| [HBASE-18083](https://issues.apache.org/jira/browse/HBASE-18083) | Make large/small file clean thread number configurable in HFileCleaner | Major | . |
| [HBASE-16730](https://issues.apache.org/jira/browse/HBASE-16730) | Exclude junit as a transitive dependency from hadoop-common | Trivial | hbase |
| [HBASE-15062](https://issues.apache.org/jira/browse/HBASE-15062) | IntegrationTestMTTR conditionally run some tests | Minor | integration tests |
| [HBASE-11707](https://issues.apache.org/jira/browse/HBASE-11707) | Using Map instead of list in FailedServers of RpcClient | Minor | Client |
| [HBASE-18286](https://issues.apache.org/jira/browse/HBASE-18286) | Create static empty byte array to save memory | Trivial | community |
| [HBASE-17995](https://issues.apache.org/jira/browse/HBASE-17995) | improve log messages during snapshot related tests | Trivial | integration tests, mapreduce, snapshots, test |
| [HBASE-15391](https://issues.apache.org/jira/browse/HBASE-15391) | Avoid too large "deleted from META" info log | Minor | . |
| [HBASE-16585](https://issues.apache.org/jira/browse/HBASE-16585) | Rewrite the delegation token tests with Parameterized pattern | Major | security, test |
| [HBASE-13197](https://issues.apache.org/jira/browse/HBASE-13197) | Connection API cleanup | Major | API |
| [HBASE-15756](https://issues.apache.org/jira/browse/HBASE-15756) | Pluggable RpcServer | Critical | Performance, rpc |
| [HBASE-17110](https://issues.apache.org/jira/browse/HBASE-17110) | Improve SimpleLoadBalancer to always take server-level balance into account | Major | Balancer |
| [HBASE-18022](https://issues.apache.org/jira/browse/HBASE-18022) | Refine the error message issued with TableNotFoundException when expected table is not the same as the one fetched from meta | Minor | . |
| [HBASE-18281](https://issues.apache.org/jira/browse/HBASE-18281) | Performance update in StoreFileWriter.java for string replacement | Trivial | community |
| [HBASE-18041](https://issues.apache.org/jira/browse/HBASE-18041) | Add pylintrc file to HBase | Major | community |
| [HBASE-18275](https://issues.apache.org/jira/browse/HBASE-18275) | Formatting and grammar mistakes in schemadoc chapter | Trivial | documentation |
| [HBASE-18164](https://issues.apache.org/jira/browse/HBASE-18164) | Much faster locality cost function and candidate generator | Critical | Balancer |
| [HBASE-16351](https://issues.apache.org/jira/browse/HBASE-16351) | do dependency license check via enforcer plugin | Major | build, dependencies |
| [HBASE-18252](https://issues.apache.org/jira/browse/HBASE-18252) | Resolve BaseLoadBalancer bad practice warnings | Minor | . |
| [HBASE-18033](https://issues.apache.org/jira/browse/HBASE-18033) | Update supplemental models for new deps in Hadoop trunk | Critical | dependencies |
| [HBASE-17959](https://issues.apache.org/jira/browse/HBASE-17959) | Canary timeout should be configurable on a per-table basis | Minor | canary |
| [HBASE-17777](https://issues.apache.org/jira/browse/HBASE-17777) | TestMemstoreLAB#testLABThreading runs too long for a small test | Minor | test |
| [HBASE-18101](https://issues.apache.org/jira/browse/HBASE-18101) | Fix type mismatch on container access in QuotaCache#chore | Trivial | . |
| [HBASE-18001](https://issues.apache.org/jira/browse/HBASE-18001) | Extend the "count" shell command to support specified conditions | Minor | shell |
| [HBASE-18094](https://issues.apache.org/jira/browse/HBASE-18094) | Display the return value of the command append | Major | shell |
| [HBASE-18075](https://issues.apache.org/jira/browse/HBASE-18075) | Support namespaces and tables with non-latin alphabetical characters | Major | Client |
| [HBASE-18067](https://issues.apache.org/jira/browse/HBASE-18067) | Support a default converter for data read shell commands | Minor | shell |
| [HBASE-18019](https://issues.apache.org/jira/browse/HBASE-18019) | Close redundant memstore scanners | Major | . |
| [HBASE-17910](https://issues.apache.org/jira/browse/HBASE-17910) | Use separated StoreFileReader for streaming read | Major | regionserver, scan, Scanners |
| [HBASE-18043](https://issues.apache.org/jira/browse/HBASE-18043) | Institute a hard limit for individual cell size that cannot be overridden by clients | Major | IPC/RPC, regionserver |
| [HBASE-17343](https://issues.apache.org/jira/browse/HBASE-17343) | Make Compacting Memstore default in 2.0 with BASIC as the default type | Blocker | regionserver |
| [HBASE-18021](https://issues.apache.org/jira/browse/HBASE-18021) | Add more info in timed out RetriesExhaustedException for read replica client get processing, | Minor | Client |
| [HBASE-18017](https://issues.apache.org/jira/browse/HBASE-18017) | Reduce frequency of setStoragePolicy failure warnings | Minor | . |
| [HBASE-14925](https://issues.apache.org/jira/browse/HBASE-14925) | Develop HBase shell command/tool to list table's region info through command line | Major | shell |
| [HBASE-17924](https://issues.apache.org/jira/browse/HBASE-17924) | Consider sorting the row order when processing multi() ops before taking rowlocks | Major | . |
| [HBASE-18015](https://issues.apache.org/jira/browse/HBASE-18015) | Storage class aware block placement for procedure v2 WALs | Minor | . |
| [HBASE-18007](https://issues.apache.org/jira/browse/HBASE-18007) | Clean up rest module code | Trivial | . |
| [HBASE-17990](https://issues.apache.org/jira/browse/HBASE-17990) | Refactor TestFSUtils to use Before | Trivial | . |
| [HBASE-16466](https://issues.apache.org/jira/browse/HBASE-16466) | HBase snapshots support in VerifyReplication tool to reduce load on live HBase cluster with large tables | Major | hbase |
| [HBASE-12870](https://issues.apache.org/jira/browse/HBASE-12870) | "Major compaction triggered" and "Skipping major compaction" messages lack the region information | Major | Compaction |
| [HBASE-17973](https://issues.apache.org/jira/browse/HBASE-17973) | Create shell command to identify regions with poor locality | Major | shell |
| [HBASE-17979](https://issues.apache.org/jira/browse/HBASE-17979) | HBase Shell 'list' Command Help Doc Improvements | Minor | shell |
| [HBASE-17875](https://issues.apache.org/jira/browse/HBASE-17875) | Document why objects over 10MB are not well-suited for hbase | Major | documentation, mob |
| [HBASE-8486](https://issues.apache.org/jira/browse/HBASE-8486) | IS\_ROOT isnt needed in HTableDescriptor. | Minor | . |
| [HBASE-17817](https://issues.apache.org/jira/browse/HBASE-17817) | Make Regionservers log which tables it removed coprocessors from when aborting | Major | Coprocessors, regionserver |
| [HBASE-17835](https://issues.apache.org/jira/browse/HBASE-17835) | Spelling mistakes in the Java source | Trivial | documentation |
| [HBASE-17962](https://issues.apache.org/jira/browse/HBASE-17962) | Improve documentation on Rest interface | Trivial | documentation, REST |
| [HBASE-17877](https://issues.apache.org/jira/browse/HBASE-17877) | Improve HBase's byte[] comparator | Major | util |
| [HBASE-9899](https://issues.apache.org/jira/browse/HBASE-9899) | for idempotent operation dups, return the result instead of throwing conflict exception | Major | . |
| [HBASE-17514](https://issues.apache.org/jira/browse/HBASE-17514) | Warn when Thrift Server 1 is configured for proxy users but not the HTTP transport | Minor | Thrift, Usability |
| [HBASE-17944](https://issues.apache.org/jira/browse/HBASE-17944) | Removed unused JDK version parsing from ClassSize. | Minor | build |
| [HBASE-17912](https://issues.apache.org/jira/browse/HBASE-17912) | Avoid major compactions on region server startup | Major | Compaction |
| [HBASE-17888](https://issues.apache.org/jira/browse/HBASE-17888) | Add generic methods for updating metrics on start and end of a procedure execution | Major | proc-v2 |
| [HBASE-16469](https://issues.apache.org/jira/browse/HBASE-16469) | Several log refactoring/improvement suggestions | Major | Operability |
| [HBASE-17836](https://issues.apache.org/jira/browse/HBASE-17836) | CellUtil#estimatedSerializedSizeOf is slow when input is ByteBufferCell | Minor | . |
| [HBASE-16969](https://issues.apache.org/jira/browse/HBASE-16969) | RegionCoprocessorServiceExec should override the toString() for debugging | Minor | . |
| [HBASE-17854](https://issues.apache.org/jira/browse/HBASE-17854) | Use StealJobQueue in HFileCleaner after HBASE-17215 | Major | . |
| [HBASE-17215](https://issues.apache.org/jira/browse/HBASE-17215) | Separate small/large file delete threads in HFileCleaner to accelerate archived hfile cleanup speed | Major | . |
| [HBASE-17831](https://issues.apache.org/jira/browse/HBASE-17831) | Support small scan in thrift2 | Major | Thrift |
| [HBASE-17623](https://issues.apache.org/jira/browse/HBASE-17623) | Reuse the bytes array when building the hfile block | Major | HFile |
| [HBASE-17815](https://issues.apache.org/jira/browse/HBASE-17815) | Remove the unused field in PrefixTreeSeeker | Trivial | . |
| [HBASE-17778](https://issues.apache.org/jira/browse/HBASE-17778) | Remove the testing code in the AsyncRequestFutureImpl | Trivial | . |
| [HBASE-15339](https://issues.apache.org/jira/browse/HBASE-15339) | Improve DateTieredCompactionPolicy | Major | Compaction |
| [HBASE-17747](https://issues.apache.org/jira/browse/HBASE-17747) | Support both weak and soft object pool | Major | . |
| [HBASE-15429](https://issues.apache.org/jira/browse/HBASE-15429) | Add a split policy for busy regions | Major | regionserver |
| [HBASE-17731](https://issues.apache.org/jira/browse/HBASE-17731) | Fractional latency reporting in MultiThreadedAction | Trivial | . |
| [HBASE-16977](https://issues.apache.org/jira/browse/HBASE-16977) | VerifyReplication should log a printable representation of the row keys | Minor | Replication |
| [HBASE-15941](https://issues.apache.org/jira/browse/HBASE-15941) | HBCK repair should not unsplit healthy splitted region | Major | hbck |
| [HBASE-17532](https://issues.apache.org/jira/browse/HBASE-17532) | Replace explicit type with diamond operator | Trivial | build |
| [HBASE-17734](https://issues.apache.org/jira/browse/HBASE-17734) | Guard against possibly copying the qualifier in the ScanDeleteTracker | Minor | . |
| [HBASE-17690](https://issues.apache.org/jira/browse/HBASE-17690) | Clean up MOB code | Major | mob |
| [HBASE-16188](https://issues.apache.org/jira/browse/HBASE-16188) | Add EventCounter information to log4j properties file | Minor | . |
| [HBASE-17689](https://issues.apache.org/jira/browse/HBASE-17689) | Add support for table.existsAll in thrift2 THBaseservice | Major | Thrift |
| [HBASE-17634](https://issues.apache.org/jira/browse/HBASE-17634) | Clean up the usage of Result.isPartial | Major | scan |
| [HBASE-17654](https://issues.apache.org/jira/browse/HBASE-17654) | RSGroup code refactoring | Major | rsgroup |
| [HBASE-17057](https://issues.apache.org/jira/browse/HBASE-17057) | Minor compactions should also drop page cache behind reads | Major | Compaction |
| [HBASE-17676](https://issues.apache.org/jira/browse/HBASE-17676) | Get class name once for all in AbstractFSWAL | Major | Performance |
| [HBASE-13718](https://issues.apache.org/jira/browse/HBASE-13718) | Add a pretty printed table description to the table detail page of HBase's master | Minor | hbase |
| [HBASE-17172](https://issues.apache.org/jira/browse/HBASE-17172) | Optimize mob compaction with \_del files | Major | mob |
| [HBASE-17627](https://issues.apache.org/jira/browse/HBASE-17627) | Active workers metric for thrift | Major | Thrift |
| [HBASE-17637](https://issues.apache.org/jira/browse/HBASE-17637) | Update progress more frequently in IntegrationTestBigLinkedList.Generator.persist | Minor | . |
| [HBASE-17605](https://issues.apache.org/jira/browse/HBASE-17605) | Refactor procedure framework code | Major | proc-v2 |
| [HBASE-17280](https://issues.apache.org/jira/browse/HBASE-17280) | Add mechanism to control hbase cleaner behavior | Minor | Client, hbase, shell |
| [HBASE-17613](https://issues.apache.org/jira/browse/HBASE-17613) | avoid copy of family when initializing the FSWALEntry | Minor | . |
| [HBASE-17437](https://issues.apache.org/jira/browse/HBASE-17437) | Support specifying a WAL directory outside of the root directory | Major | Filesystem Integration, wal |
| [HBASE-17592](https://issues.apache.org/jira/browse/HBASE-17592) | Fix typo in IPCUtil and RpcConnection | Trivial | . |
| [HBASE-17588](https://issues.apache.org/jira/browse/HBASE-17588) | Remove unused imports brought in by HBASE-17437 | Trivial | . |
| [HBASE-17552](https://issues.apache.org/jira/browse/HBASE-17552) | Update developer section in hbase book | Major | . |
| [HBASE-17543](https://issues.apache.org/jira/browse/HBASE-17543) | Create additional ReplicationEndpoint WALEntryFilters by configuration | Major | Replication |
| [HBASE-17569](https://issues.apache.org/jira/browse/HBASE-17569) | HBase-Procedure module need to support mvn clean test -PskipProcedureTests to skip unit test | Minor | proc-v2 |
| [HBASE-17555](https://issues.apache.org/jira/browse/HBASE-17555) | Change calls to deprecated getHBaseAdmin to getAdmin | Minor | . |
| [HBASE-17563](https://issues.apache.org/jira/browse/HBASE-17563) | Foreach and switch in RootDocProcessor and StabilityOptions | Trivial | . |
| [HBASE-17515](https://issues.apache.org/jira/browse/HBASE-17515) | Reduce memory footprint of RegionLoads kept by StochasticLoadBalancer | Major | . |
| [HBASE-17462](https://issues.apache.org/jira/browse/HBASE-17462) | Use sliding window for read/write request costs in StochasticLoadBalancer | Major | . |
| [HBASE-16698](https://issues.apache.org/jira/browse/HBASE-16698) | Performance issue: handlers stuck waiting for CountDownLatch inside WALKey#getWriteEntry under high writing workload | Major | Performance |
| [HBASE-17404](https://issues.apache.org/jira/browse/HBASE-17404) | Replace explicit type with diamond operator in hbase-annotations | Trivial | . |
| [HBASE-10699](https://issues.apache.org/jira/browse/HBASE-10699) | Optimize some code; set capacity on arraylist when possible; use isEmpty; reduce allocations | Major | . |
| [HBASE-17488](https://issues.apache.org/jira/browse/HBASE-17488) | WALEdit should be lazily instantiated | Trivial | . |
| [HBASE-17408](https://issues.apache.org/jira/browse/HBASE-17408) | Introduce per request limit by number of mutations | Major | . |
| [HBASE-17291](https://issues.apache.org/jira/browse/HBASE-17291) | Remove ImmutableSegment#getKeyValueScanner | Major | Scanners |
| [HBASE-17314](https://issues.apache.org/jira/browse/HBASE-17314) | Limit total buffered size for all replication sources | Major | Replication |
| [HBASE-17348](https://issues.apache.org/jira/browse/HBASE-17348) | Remove the unused hbase.replication from javadoc/comment/book completely | Trivial | . |
| [HBASE-15924](https://issues.apache.org/jira/browse/HBASE-15924) | Enhance hbase services autorestart capability to hbase-daemon.sh | Major | . |
| [HBASE-17292](https://issues.apache.org/jira/browse/HBASE-17292) | Add observer notification before bulk loaded hfile is moved to region directory | Major | . |
| [HBASE-17332](https://issues.apache.org/jira/browse/HBASE-17332) | Replace HashMap to Array for DataBlockEncoding.idToEncoding | Major | . |
| [HBASE-17331](https://issues.apache.org/jira/browse/HBASE-17331) | Avoid busy waiting in ThrottledInputStream | Minor | . |
| [HBASE-17318](https://issues.apache.org/jira/browse/HBASE-17318) | Increment does not add new column if the increment amount is zero at first time writing | Major | . |
| [HBASE-17298](https://issues.apache.org/jira/browse/HBASE-17298) | remove unused code in HRegion#doMiniBatchMutation | Minor | regionserver |
| [HBASE-17296](https://issues.apache.org/jira/browse/HBASE-17296) | Provide per peer throttling for replication | Major | Replication |
| [HBASE-17276](https://issues.apache.org/jira/browse/HBASE-17276) | Reduce log spam from WrongRegionException in large multi()'s | Minor | regionserver |
| [HBASE-17241](https://issues.apache.org/jira/browse/HBASE-17241) | Avoid compacting already compacted mob files with \_del files | Major | mob |
| [HBASE-17207](https://issues.apache.org/jira/browse/HBASE-17207) | Arrays.asList() with too few arguments | Trivial | . |
| [HBASE-16700](https://issues.apache.org/jira/browse/HBASE-16700) | Allow for coprocessor whitelisting | Minor | Coprocessors |
| [HBASE-17239](https://issues.apache.org/jira/browse/HBASE-17239) | Add UnsafeByteOperations#wrap(ByteInput, int offset, int len) API | Major | Protobufs |
| [HBASE-17245](https://issues.apache.org/jira/browse/HBASE-17245) | Replace HTableDescriptor#htd.getColumnFamilies().length with a low-cost implementation | Minor | . |
| [HBASE-14882](https://issues.apache.org/jira/browse/HBASE-14882) | Provide a Put API that adds the provided family, qualifier, value without copying | Major | . |
| [HBASE-17243](https://issues.apache.org/jira/browse/HBASE-17243) | Reuse CompactionPartitionId and avoid creating MobFileName in PartitionedMobCompactor to avoid unnecessary new objects | Minor | mob |
| [HBASE-17194](https://issues.apache.org/jira/browse/HBASE-17194) | Assign the new region to the idle server after splitting | Minor | . |
| [HBASE-17232](https://issues.apache.org/jira/browse/HBASE-17232) | Replace HashSet with ArrayList to accumulate delayed scanners in KVHeap and StoreScanner. | Major | . |
| [HBASE-17161](https://issues.apache.org/jira/browse/HBASE-17161) | MOB : Make ref cell creation more efficient | Major | . |
| [HBASE-17235](https://issues.apache.org/jira/browse/HBASE-17235) | Improvement in creation of CIS for onheap buffer cases | Major | rpc |
| [HBASE-17191](https://issues.apache.org/jira/browse/HBASE-17191) | Make use of UnsafeByteOperations#unsafeWrap(ByteBuffer buffer) in PBUtil#toCell(Cell cell) | Major | . |
| [HBASE-17205](https://issues.apache.org/jira/browse/HBASE-17205) | Add a metric for the duration of region in transition | Minor | Region Assignment |
| [HBASE-17216](https://issues.apache.org/jira/browse/HBASE-17216) | A Few Fields Can Be Safely Made Static | Major | . |
| [HBASE-17212](https://issues.apache.org/jira/browse/HBASE-17212) | Should add null checker on table name in HTable constructor and RegionServerCallable | Major | . |
| [HBASE-17184](https://issues.apache.org/jira/browse/HBASE-17184) | Code cleanup of LruBlockCache | Trivial | . |
| [HBASE-17211](https://issues.apache.org/jira/browse/HBASE-17211) | Add more details in log when UnknownScannerException thrown in ScannerCallable | Minor | Operability |
| [HBASE-17178](https://issues.apache.org/jira/browse/HBASE-17178) | Add region balance throttling | Major | Balancer |
| [HBASE-16302](https://issues.apache.org/jira/browse/HBASE-16302) | age of last shipped op and age of last applied op should be histograms | Major | Replication |
| [HBASE-16561](https://issues.apache.org/jira/browse/HBASE-16561) | Add metrics about read/write/scan queue length and active read/write/scan handler count | Minor | IPC/RPC, metrics |
| [HBASE-17086](https://issues.apache.org/jira/browse/HBASE-17086) | Add comments to explain why Cell#getTagsLength() returns an int, rather than a short | Minor | Interface |
| [HBASE-17176](https://issues.apache.org/jira/browse/HBASE-17176) | Reuse the builder in RequestConverter | Minor | . |
| [HBASE-17157](https://issues.apache.org/jira/browse/HBASE-17157) | Increase the default mergeable threshold for mob compaction | Major | mob |
| [HBASE-17129](https://issues.apache.org/jira/browse/HBASE-17129) | Remove public from methods in DataType interface | Minor | . |
| [HBASE-17123](https://issues.apache.org/jira/browse/HBASE-17123) | Add postBulkLoadHFile variant that notifies the final paths for the hfiles | Major | . |
| [HBASE-17126](https://issues.apache.org/jira/browse/HBASE-17126) | Expose KeyValue#checkParameters() and checkForTagsLength() to be used by other Cell implementations | Minor | Client, regionserver |
| [HBASE-17088](https://issues.apache.org/jira/browse/HBASE-17088) | Refactor RWQueueRpcExecutor/BalancedQueueRpcExecutor/RpcExecutor | Major | rpc |
| [HBASE-16708](https://issues.apache.org/jira/browse/HBASE-16708) | Expose endpoint Coprocessor name in "responseTooSlow" log messages | Major | . |
| [HBASE-17037](https://issues.apache.org/jira/browse/HBASE-17037) | Enhance LoadIncrementalHFiles API to convey loaded files | Major | . |
| [HBASE-17077](https://issues.apache.org/jira/browse/HBASE-17077) | Don't copy the replication queue belonging to the peer which has been deleted | Minor | . |
| [HBASE-17047](https://issues.apache.org/jira/browse/HBASE-17047) | Add an API to get HBase connection cache statistics | Minor | spark |
| [HBASE-17063](https://issues.apache.org/jira/browse/HBASE-17063) | Cleanup TestHRegion : remove duplicate variables for method name and two unused params in initRegion | Minor | . |
| [HBASE-17026](https://issues.apache.org/jira/browse/HBASE-17026) | VerifyReplication log should distinguish whether good row key is result of revalidation | Minor | . |
| [HBASE-16840](https://issues.apache.org/jira/browse/HBASE-16840) | Reuse cell's timestamp and type in ScanQueryMatcher | Minor | . |
| [HBASE-17005](https://issues.apache.org/jira/browse/HBASE-17005) | Improve log message in MobFileCache | Trivial | mob |
| [HBASE-17004](https://issues.apache.org/jira/browse/HBASE-17004) | Refactor IntegrationTestManyRegions to use @ClassRule for timing out | Minor | integration tests |
| [HBASE-16946](https://issues.apache.org/jira/browse/HBASE-16946) | Provide Raw scan as an option in VerifyReplication | Minor | hbase |
| [HBASE-17013](https://issues.apache.org/jira/browse/HBASE-17013) | Add constructor to RowMutations for initializing the capacity of internal list | Minor | . |
| [HBASE-17006](https://issues.apache.org/jira/browse/HBASE-17006) | Add names to threads for better debugability of thread dumps | Minor | Operability |
| [HBASE-17014](https://issues.apache.org/jira/browse/HBASE-17014) | Add clearly marked starting and shutdown log messages for all services. | Minor | Operability |
| [HBASE-16950](https://issues.apache.org/jira/browse/HBASE-16950) | Print raw stats in the end of procedure performance tools for parsing results from scripts | Trivial | . |
| [HBASE-16783](https://issues.apache.org/jira/browse/HBASE-16783) | Use ByteBufferPool for the header and message during Rpc response | Minor | . |
| [HBASE-16562](https://issues.apache.org/jira/browse/HBASE-16562) | ITBLL should fail to start if misconfigured | Major | integration tests |
| [HBASE-16414](https://issues.apache.org/jira/browse/HBASE-16414) | Improve performance for RPC encryption with Apache Common Crypto | Major | IPC/RPC |
| [HBASE-16854](https://issues.apache.org/jira/browse/HBASE-16854) | Refactor the org.apache.hadoop.hbase.client.Action | Minor | . |
| [HBASE-16774](https://issues.apache.org/jira/browse/HBASE-16774) | [shell] Add coverage to TestShell when ZooKeeper is not reachable | Major | shell, test |
| [HBASE-16844](https://issues.apache.org/jira/browse/HBASE-16844) | Procedure V2: DispatchMergingRegionsProcedure to use base class StateMachineProcedure for abort and rollback | Trivial | master, proc-v2 |
| [HBASE-16818](https://issues.apache.org/jira/browse/HBASE-16818) | Avoid multiple copies of binary data during the conversion from Result to Row | Major | spark |
| [HBASE-16821](https://issues.apache.org/jira/browse/HBASE-16821) | Enhance LoadIncrementalHFiles API to convey missing hfiles if any | Major | . |
| [HBASE-15921](https://issues.apache.org/jira/browse/HBASE-15921) | Add first AsyncTable impl and create TableImpl based on it | Major | Client |
| [HBASE-16792](https://issues.apache.org/jira/browse/HBASE-16792) | Reuse KeyValue.KeyOnlyKeyValue in BufferedDataBlockEncoder.SeekerState | Minor | . |
| [HBASE-16784](https://issues.apache.org/jira/browse/HBASE-16784) | Make use of ExtendedCell#write(OutputStream os) for the default HFileWriter#append() | Major | . |
| [HBASE-16809](https://issues.apache.org/jira/browse/HBASE-16809) | Save one cell length calculation in HeapMemStoreLAB#copyCellInto | Minor | . |
| [HBASE-16661](https://issues.apache.org/jira/browse/HBASE-16661) | Add last major compaction age to per-region metrics | Minor | . |
| [HBASE-16773](https://issues.apache.org/jira/browse/HBASE-16773) | AccessController should access local region if possible | Major | . |
| [HBASE-16657](https://issues.apache.org/jira/browse/HBASE-16657) | Expose per-region last major compaction timestamp in RegionServer UI | Minor | regionserver, UI |
| [HBASE-16772](https://issues.apache.org/jira/browse/HBASE-16772) | Add verbose option to VerifyReplication for logging good rows | Minor | Replication, Usability |
| [HBASE-16690](https://issues.apache.org/jira/browse/HBASE-16690) | Move znode path configs to a separated class | Major | Zookeeper |
| [HBASE-16672](https://issues.apache.org/jira/browse/HBASE-16672) | Add option for bulk load to always copy hfile(s) instead of renaming | Major | . |
| [HBASE-16720](https://issues.apache.org/jira/browse/HBASE-16720) | Sort build ids in flaky dashboard | Minor | . |
| [HBASE-16691](https://issues.apache.org/jira/browse/HBASE-16691) | Optimize KeyOnlyFilter by utilizing KeyOnlyCell | Major | . |
| [HBASE-16714](https://issues.apache.org/jira/browse/HBASE-16714) | Procedure V2 - use base class to remove duplicate set up test code in table DDL procedures | Major | proc-v2, test |
| [HBASE-16694](https://issues.apache.org/jira/browse/HBASE-16694) | Reduce garbage for onDiskChecksum in HFileBlock | Minor | . |
| [HBASE-16705](https://issues.apache.org/jira/browse/HBASE-16705) | Eliminate long to Long auto boxing in LongComparator | Minor | Filters |
| [HBASE-16692](https://issues.apache.org/jira/browse/HBASE-16692) | Make ByteBufferUtils#equals safer and correct | Major | . |
| [HBASE-16667](https://issues.apache.org/jira/browse/HBASE-16667) | Building with JDK 8: ignoring option MaxPermSize=256m | Minor | build |
| [HBASE-16423](https://issues.apache.org/jira/browse/HBASE-16423) | Add re-compare option to VerifyReplication to avoid occasional inconsistent rows | Minor | Replication |
| [HBASE-16680](https://issues.apache.org/jira/browse/HBASE-16680) | Reduce garbage in BufferChain | Minor | . |
| [HBASE-16659](https://issues.apache.org/jira/browse/HBASE-16659) | Use CellUtil.createFirstOnRow instead of KeyValueUtil.createFirstOnRow in some places. | Minor | . |
| [HBASE-16646](https://issues.apache.org/jira/browse/HBASE-16646) | Enhance LoadIncrementalHFiles API to accept store file paths as input | Major | . |
| [HBASE-16658](https://issues.apache.org/jira/browse/HBASE-16658) | Optimize UTF8 string/byte conversions | Minor | . |
| [HBASE-16640](https://issues.apache.org/jira/browse/HBASE-16640) | TimeoutBlockingQueue#remove() should return whether the entry is removed | Minor | . |
| [HBASE-15949](https://issues.apache.org/jira/browse/HBASE-15949) | Cleanup TestRegionServerMetrics | Minor | . |
| [HBASE-16381](https://issues.apache.org/jira/browse/HBASE-16381) | Shell deleteall command should support row key prefixes | Minor | shell |
| [HBASE-16616](https://issues.apache.org/jira/browse/HBASE-16616) | Rpc handlers stuck on ThreadLocalMap.expungeStaleEntry | Major | Performance |
| [HBASE-16086](https://issues.apache.org/jira/browse/HBASE-16086) | TableCfWALEntryFilter and ScopeWALEntryFilter should not redundantly iterate over cells. | Major | . |
| [HBASE-16541](https://issues.apache.org/jira/browse/HBASE-16541) | Avoid unnecessary cell copy in Result#compareResults | Major | . |
| [HBASE-16399](https://issues.apache.org/jira/browse/HBASE-16399) | Provide an API to get list of failed regions and servername in Canary | Major | canary |
| [HBASE-16502](https://issues.apache.org/jira/browse/HBASE-16502) | Reduce garbage in BufferedDataBlockEncoder | Major | . |
| [HBASE-16509](https://issues.apache.org/jira/browse/HBASE-16509) | Add option to LoadIncrementalHFiles which allows skipping unmatched column families | Major | . |
| [HBASE-16224](https://issues.apache.org/jira/browse/HBASE-16224) | Reduce the number of RPCs for the large PUTs | Minor | Client |
| [HBASE-16508](https://issues.apache.org/jira/browse/HBASE-16508) | Move UnexpectedStateException to common | Trivial | . |
| [HBASE-16486](https://issues.apache.org/jira/browse/HBASE-16486) | Unify system table creation using the same createSystemTable API. | Minor | proc-v2 |
| [HBASE-16448](https://issues.apache.org/jira/browse/HBASE-16448) | Custom metrics for custom replication endpoints | Major | Replication |
| [HBASE-16450](https://issues.apache.org/jira/browse/HBASE-16450) | Shell tool to dump replication queues | Major | Operability, Replication |
| [HBASE-16455](https://issues.apache.org/jira/browse/HBASE-16455) | Provide API for obtaining all the WAL files | Major | . |
| [HBASE-16422](https://issues.apache.org/jira/browse/HBASE-16422) | Tighten our guarantees on compatibility across patch versions | Major | documentation |
| [HBASE-16434](https://issues.apache.org/jira/browse/HBASE-16434) | Improve flaky dashboard | Minor | . |
| [HBASE-16419](https://issues.apache.org/jira/browse/HBASE-16419) | check REPLICATION\_SCOPE's value more stringently | Major | . |
| [HBASE-16385](https://issues.apache.org/jira/browse/HBASE-16385) | Have hbase-rest pull hbase.rest.port from Constants.java | Minor | REST |
| [HBASE-16379](https://issues.apache.org/jira/browse/HBASE-16379) | [replication] Minor improvement to replication/copy\_tables\_desc.rb | Trivial | Replication, shell |
| [HBASE-14345](https://issues.apache.org/jira/browse/HBASE-14345) | Consolidate printUsage in IntegrationTestLoadAndVerify | Trivial | integration tests |
| [HBASE-16299](https://issues.apache.org/jira/browse/HBASE-16299) | Update REST API scanner with ability to do reverse scan | Minor | REST |
| [HBASE-12770](https://issues.apache.org/jira/browse/HBASE-12770) | Don't transfer all the queued hlogs of a dead server to the same alive server | Minor | Replication |
| [HBASE-15882](https://issues.apache.org/jira/browse/HBASE-15882) | Upgrade to yetus precommit 0.3.0 | Critical | build |
| [HBASE-8386](https://issues.apache.org/jira/browse/HBASE-8386) | deprecate TableMapReduce.addDependencyJars(Configuration, class\
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