| HADOOP-12706 | TestLocalFsFCStatistics#testStatisticsThreadLocalDataCleanUp times out occasionally | Major | test | Jason Lowe | Sangjin Lee |
| HADOOP-12107 | long running apps may have a huge number of StatisticsData instances under FileSystem | Critical | fs | Sangjin Lee | Sangjin Lee |
| HADOOP-11252 | RPC client does not time out by default | Critical | ipc | Wilfred Spiegelenburg | Masatake Iwasaki |
| HDFS-9600 | do not check replication if the block is under construction | Critical | . | Phil Yang | Phil Yang |
| HDFS-9574 | Reduce client failures during datanode restart | Major | . | Kihwal Lee | Kihwal Lee |
| HDFS-9445 | Datanode may deadlock while handling a bad volume | Blocker | . | Kihwal Lee | Walter Su |
| HDFS-9313 | Possible NullPointerException in BlockManager if no excess replica can be chosen | Major | . | Ming Ma | Ming Ma |
| HDFS-9294 | DFSClient deadlock when close file and failed to renew lease | Blocker | hdfs-client | DENG FEI | Brahma Reddy Battula |
| HDFS-9220 | Reading small file (< 512 bytes) that is open for append fails due to incorrect checksum | Blocker | . | Bogdan Raducanu | Jing Zhao |
| HDFS-9178 | Slow datanode I/O can cause a wrong node to be marked bad | Critical | . | Kihwal Lee | Kihwal Lee |
| HDFS-8767 | RawLocalFileSystem.listStatus() returns null for UNIX pipefile | Critical | . | Haohui Mai | Kanaka Kumar Avvaru |
| HDFS-6945 | BlockManager should remove a block from excessReplicateMap and decrement ExcessBlocks metric when the block is removed | Critical | namenode | Akira AJISAKA | Akira AJISAKA |
| HDFS-4660 | Block corruption can happen during pipeline recovery | Blocker | datanode | Peng Zhang | Kihwal Lee |
| MAPREDUCE-6621 | Memory Leak in JobClient#submitJobInternal() | Major | . | Xuan Gong | Xuan Gong |
| MAPREDUCE-6619 | HADOOP_CLASSPATH is overwritten in MR container | Major | mrv2 | shanyu zhao | Junping Du |
| MAPREDUCE-6618 | YarnClientProtocolProvider leaking the YarnClient thread. | Major | . | Xuan Gong | Xuan Gong |
| MAPREDUCE-6577 | MR AM unable to load native library without MR_AM_ADMIN_USER_ENV set | Critical | mr-am | Sangjin Lee | Sangjin Lee |
| MAPREDUCE-6554 | MRAppMaster servicestart failing with NPE in MRAppMaster#parsePreviousJobHistory | Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| MAPREDUCE-6492 | AsyncDispatcher exit with NPE on TaskAttemptImpl#sendJHStartEventForAssignedFailTask | Critical | . | Bibin A Chundatt | Bibin A Chundatt |
| MAPREDUCE-6363 | [NNBench] Lease mismatch error when running with multiple mappers | Critical | benchmarks | Brahma Reddy Battula | Bibin A Chundatt |
| MAPREDUCE-5982 | Task attempts that fail from the ASSIGNED state can disappear | Major | mr-am | Jason Lowe | Chang Li |
| YARN-4598 | Invalid event: RESOURCE_FAILED at CONTAINER_CLEANEDUP_AFTER_KILL | Major | nodemanager | tangshangwen | tangshangwen |
| YARN-4581 | AHS writer thread leak makes RM crash while RM is recovering | Major | resourcemanager | sandflee | sandflee |
| YARN-4546 | ResourceManager crash due to scheduling opportunity overflow | Critical | resourcemanager | Jason Lowe | Jason Lowe |
| YARN-4452 | NPE when submit Unmanaged application | Critical | . | Naganarasimha G R | Naganarasimha G R |
| YARN-4414 | Nodemanager connection errors are retried at multiple levels | Major | nodemanager | Jason Lowe | Chang Li |
| YARN-4380 | TestResourceLocalizationService.testDownloadingResourcesOnContainerKill fails intermittently | Major | test | Tsuyoshi Ozawa | Varun Saxena |
| YARN-4354 | Public resource localization fails with NPE | Blocker | nodemanager | Jason Lowe | Jason Lowe |
| YARN-4180 | AMLauncher does not retry on failures when talking to NM | Critical | resourcemanager | Anubhav Dhoot | Anubhav Dhoot |
| YARN-3857 | Memory leak in ResourceManager with SIMPLE mode | Critical | resourcemanager | mujunchao | mujunchao |
| YARN-3849 | Too much of preemption activity causing continuos killing of containers across queues | Critical | capacityscheduler | Sunil G | Sunil G |
| YARN-3842 | NMProxy should retry on NMNotYetReadyException | Critical | . | Karthik Kambatla | Robert Kanter |
| YARN-3697 | FairScheduler: ContinuousSchedulingThread can fail to shutdown | Critical | fairscheduler | zhihai xu | zhihai xu |
| YARN-3695 | ServerProxy (NMProxy, etc.) shouldn't retry forever for non network exception. | Major | . | Junping Du | Raju Bairishetti |
| YARN-3535 | Scheduler must re-request container resources when RMContainer transitions from ALLOCATED to KILLED | Critical | capacityscheduler, fairscheduler, resourcemanager | Peng Zhang | Peng Zhang |
| YARN-2975 | FSLeafQueue app lists are accessed without required locks | Blocker | . | Karthik Kambatla | Karthik Kambatla |