http://git-wip-us.apache.org/repos/asf/hbase/blob/d7547c61/CHANGES.md ---------------------------------------------------------------------- diff --git a/CHANGES.md b/CHANGES.md new file mode 100644 index 0000000..493ac79 --- /dev/null +++ b/CHANGES.md @@ -0,0 +1,6034 @@ +# HBASE Changelog +<!--- + Licensed to the Apache Software Foundation (ASF) under one + or more contributor license agreements. See the NOTICE file + distributed with this work for additional information + regarding copyright ownership. The ASF licenses this file + to you under the Apache License, Version 2.0 (the + "License"); you may not use this file except in compliance + with the License. You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. +--> + +## Release 2.0.0 - Unreleased (as of 2018-04-06) + +### INCOMPATIBLE CHANGES: + +| JIRA | Summary | Priority | Component | +|:---- |:---- | :--- |:---- | +| [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\<T\> 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-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 doesnât 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 \<HBase Counters, ROWS\_SCANNED\> 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\<Option\>) 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\<Put\>) 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) | Expos
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