| HDFS-7258 | CacheReplicationMonitor rescan schedule log should use DEBUG level instead of INFO level | Minor | namenode | Xiaoyu Yao | Xiaoyu Yao | 
| HDFS-7530 | Allow renaming of encryption zone roots | Minor | namenode | Charles Lamb | Charles Lamb | 
| HADOOP-7817 | RawLocalFileSystem.append() should give FSDataOutputStream with accurate .getPos() | Major | fs | Kristofer Tomasette | Kanaka Kumar Avvaru | 
| MAPREDUCE-6413 | TestLocalJobSubmission is failing with unknown host | Major | test | Jason Lowe | zhihai xu | 
| MAPREDUCE-5817 | Mappers get rescheduled on node transition even after all reducers are completed | Major | applicationmaster | Sangjin Lee | Sangjin Lee | 
| HDFS-8845 | DiskChecker should not traverse the entire tree | Major | . | Chang Li | Chang Li | 
| HDFS-8581 | ContentSummary on / skips further counts on yielding lock | Minor | namenode | tongshiquan | J.Andreina | 
| HADOOP-12348 | MetricsSystemImpl creates MetricsSourceAdapter with wrong time unit parameter. | Major | metrics | zhihai xu | zhihai xu | 
| MAPREDUCE-6302 | Preempt reducers after a configurable timeout irrespective of headroom | Critical | . | mai shurong | Karthik Kambatla | 
| HADOOP-12482 | Race condition in JMX cache update | Major | . | Tony Wu | Tony Wu | 
| HDFS-9347 | Invariant assumption in TestQuorumJournalManager.shutdown() is wrong | Major | test | Wei-Chiu Chuang | Wei-Chiu Chuang | 
| HADOOP-12559 | KMS connection failures should trigger TGT renewal | Major | security | Zhe Zhang | Zhe Zhang | 
| HADOOP-12682 | Fix TestKMS#testKMSRestart* failure | Major | . | Wei-Chiu Chuang | Wei-Chiu Chuang | 
| HADOOP-12773 | HBase classes fail to load with client/job classloader enabled | Major | util | Sangjin Lee | Sangjin Lee | 
| HDFS-9752 | Permanent write failures may happen to slow writers during datanode rolling upgrades | Critical | . | Kihwal Lee | Walter Su | 
| HADOOP-12589 | Fix intermittent test failure of TestCopyPreserveFlag | Major | test | Tsuyoshi Ozawa | Masatake Iwasaki | 
| HADOOP-12810 | FileSystem#listLocatedStatus causes unnecessary RPC calls | Major | fs, fs/s3 | Ryan Blue | Ryan Blue | 
| MAPREDUCE-6637 | Testcase Failure : TestFileInputFormat.testSplitLocationInfo | Major | test | Brahma Reddy Battula | Brahma Reddy Battula | 
| MAPREDUCE-6635 | Unsafe long to int conversion in UncompressedSplitLineReader and IndexOutOfBoundsException | Critical | . | Sergey Shelukhin | Junping Du | 
| YARN-2046 | Out of band heartbeats are sent only on container kill and possibly too early | Major | nodemanager | Jason Lowe | Ming Ma | 
| YARN-4722 | AsyncDispatcher logs redundant event queue sizes | Major | . | Jason Lowe | Jason Lowe | 
| YARN-4761 | NMs reconnecting with changed capabilities can lead to wrong cluster resource calculations on fair scheduler | Major | fairscheduler | Sangjin Lee | Sangjin Lee | 
| MAPREDUCE-6656 | [NNBench] OP_DELETE operation isn’t working after MAPREDUCE-6363 | Blocker | . | J.Andreina | J.Andreina | 
| HADOOP-12958 | PhantomReference for filesystem statistics can trigger OOM | Major | . | Jason Lowe | Sangjin Lee | 
| HDFS-10182 | Hedged read might overwrite user’s buf | Major | . | zhouyingchao | zhouyingchao | 
| YARN-4773 | Log aggregation performs extraneous filesystem operations when rolling log aggregation is disabled | Minor | nodemanager | Jason Lowe | Jun Gong | 
| HDFS-10178 | Permanent write failures can happen if pipeline recoveries occur for the first packet | Critical | . | Kihwal Lee | Kihwal Lee | 
| HDFS-10271 | Extra bytes are getting released from reservedSpace for append | Critical | . | Brahma Reddy Battula | Brahma Reddy Battula | 
| YARN-4794 | Deadlock in NMClientImpl | Critical | . | Sumana Sathish | Jian He | 
| HADOOP-13042 | Restore lost leveldbjni LICENSE and NOTICE changes | Major | . | Andrew Wang | Andrew Wang | 
| HADOOP-13043 | Add LICENSE.txt entries for bundled javascript dependencies | Major | . | Andrew Wang | Andrew Wang | 
| HADOOP-13052 | ChecksumFileSystem mishandles crc file permissions | Major | fs | Daryn Sharp | Daryn Sharp | 
| YARN-5009 | NMLeveldbStateStoreService database can grow substantially leading to longer recovery times | Major | nodemanager | Jason Lowe | Jason Lowe | 
| MAPREDUCE-6514 | Job hangs as ask is not updated after ramping down of all reducers | Blocker | applicationmaster | Varun Saxena | Varun Saxena | 
| MAPREDUCE-6689 | MapReduce job can infinitely increase number of reducer resource requests | Blocker | . | Wangda Tan | Wangda Tan | 
| MAPREDUCE-6558 | multibyte delimiters with compressed input files generate duplicate records | Major | mrv1, mrv2 | Wilfred Spiegelenburg | Wilfred Spiegelenburg | 
| HDFS-9365 | Balancer does not work with the HDFS-6376 HA setup | Major | balancer & mover | Tsz Wo Nicholas Sze | Tsz Wo Nicholas Sze | 
| YARN-4459 | container-executor should only kill process groups | Major | nodemanager | Jun Gong | Jun Gong | 
| HDFS-10458 | getFileEncryptionInfo should return quickly for non-encrypted cluster | Major | encryption, namenode | Zhe Zhang | Zhe Zhang | 
| YARN-5206 | RegistrySecurity includes id:pass in exception text if considered invalid | Minor | client, security | Steve Loughran | Steve Loughran | 
| HADOOP-13189 | FairCallQueue makes callQueue larger than the configured capacity. | Major | ipc | Konstantin Shvachko | Vinitha Reddy Gankidi | 
| HADOOP-13255 | KMSClientProvider should check and renew tgt when doing delegation token operations. | Major | kms | Xiao Chen | Xiao Chen | 
| HADOOP-13192 | org.apache.hadoop.util.LineReader cannot handle multibyte delimiters correctly | Critical | util | binde | binde | 
| YARN-5197 | RM leaks containers if running container disappears from node update | Critical | resourcemanager | Jason Lowe | Jason Lowe | 
| YARN-5262 | Optimize sending RMNodeFinishedContainersPulledByAMEvent for every AM heartbeat | Major | resourcemanager | Rohith Sharma K S | Rohith Sharma K S | 
| HADOOP-13350 | Additional fix to LICENSE and NOTICE | Blocker | build | Xiao Chen | Xiao Chen | 
| HADOOP-12893 | Verify LICENSE.txt and NOTICE.txt | Blocker | build | Allen Wittenauer | Xiao Chen | 
| HADOOP-13297 | Add missing dependency in setting maven-remote-resource-plugin to fix builds | Major | build | Akira Ajisaka | Sean Busbey | 
| YARN-5353 | ResourceManager can leak delegation tokens when they are shared across apps | Critical | resourcemanager | Jason Lowe | Jason Lowe | 
| HADOOP-11361 | Fix a race condition in MetricsSourceAdapter.updateJmxCache | Major | . | Brahma Reddy Battula | Brahma Reddy Battula | 
| HDFS-10544 | Balancer doesn’t work with IPFailoverProxyProvider | Major | balancer & mover, ha | Zhe Zhang | Zhe Zhang | 
| YARN-5462 | TestNodeStatusUpdater.testNodeStatusUpdaterRetryAndNMShutdown fails intermittently | Major | . | Eric Badger | Eric Badger | 
| HADOOP-13434 | Add quoting to Shell class | Major | . | Owen O’Malley | Owen O’Malley | 
| HDFS-9696 | Garbage snapshot records lingering forever | Critical | . | Kihwal Lee | Kihwal Lee | 
| HADOOP-13494 | ReconfigurableBase can log sensitive information | Major | security | Sean Mackrory | Sean Mackrory | 
| HDFS-9530 | ReservedSpace is not cleared for abandoned Blocks | Critical | datanode | Fei Hui | Brahma Reddy Battula | 
| HDFS-10763 | Open files can leak permanently due to inconsistent lease update | Critical | . | Kihwal Lee | Kihwal Lee | 
| HADOOP-13579 | Fix source-level compatibility after HADOOP-11252 | Blocker | . | Akira Ajisaka | Tsuyoshi Ozawa | 
| HDFS-10870 | Wrong dfs.namenode.acls.enabled default in HdfsPermissionsGuide.apt.vm | Trivial | documentation | John Zhuge | John Zhuge | 
| YARN-5694 | ZKRMStateStore can prevent the transition to standby in branch-2.7 if the ZK node is unreachable | Critical | resourcemanager | Daniel Templeton | Daniel Templeton |