List of YARN Enhancements in Version 5.2.0

YARN-4452: NPE when submit Unmanaged application

YARN-4422: Generic AHS sometimes doesn't show started, node, or logs on App page

YARN-3849: Too much of preemption activity causing continuos killing of containers across queues

YARN-4794: Deadlock in NMClientImpl

YARN-4546: ResourceManager crash due to scheduling opportunity overflow

MAPREDUCE-6622: Add capability to set JHS job cache to a task-based limit

MAPREDUCE-6635: Unsafe long to int conversion in UncompressedSplitLineReader and IndexOutOfBoundsException

MAPREDUCE-6454: MapReduce doesn't set the HADOOP_CLASSPATH for jar lib in distributed cache.

MAPREDUCE-6376: Add avro binary support for jhist files

MAPREDUCE-6554: MRAppMaster servicestart failing with NPE in MRAppMaster#parsePreviousJobHistory

MAPREDUCE-6302: Preempt reducers after a configurable timeout irrespective of headroom

MAPREDUCE-6514: Job hangs as ask is not updated after ramping down of all reducers

MAPREDUCE-6689: MapReduce job can infinitely increase number of reducer resource requests

MAPREDUCE-5485: Allow repeating job commit by extending OutputCommitter API

MAPREDUCE-6555: TestMRAppMaster fails on trunk

MAPREDUCE-6595: Fix findbugs warnings in OutputCommitter and FileOutputCommitter

MAPREDUCE-6478: Add an option to skip cleanupJob stage or ignore cleanup failure during commitJob().

YARN-4424: Fix deadlock in RMAppImpl

YARN-4354: Public resource localization fails with NPE

YARN-2902: Killing a container that is localizing can orphan resources in the DOWNLOADING state

YARN-4180: AMLauncher does not retry on failures when talking to NM

YARN-3697: FairScheduler: ContinuousSchedulingThread can fail to shutdown

YARN-3535: Scheduler must re-request container resources when RMContainer transitions from ALLOCATED to KILLED

YARN-3857: Memory leak in ResourceManager with SIMPLE mode

YARN-3878: AsyncDispatcher can hang while stopping if it is configured for draining events on stop

YARN-3990: AsyncDispatcher may overloaded with RMAppNodeUpdateEvent when Node is connected/disconnected

YARN-3793: Several NPEs when deleting local files on NM recovery

YARN-4047: ClientRMService getApplications has high scheduler lock contention

HADOOP-12304: Applications using FileContext fail with the default file system configured to be wasb/s3/etc.

MAPREDUCE-5948: org.apache.hadoop.mapred.LineRecordReader does not handle multibyte record delimiters well

MAPREDUCE-6481: LineRecordReader may give incomplete record and wrong position/key information for uncompressed input sometimes.

MAPREDUCE-6492: AsyncDispatcher exit with NPE on TaskAttemptImpl#sendJHStartEventForAssignedFailTask

MAPREDUCE-5982: Task attempts that fail from the ASSIGNED state can disappear

MAPREDUCE-5649: Reduce cannot use more than 2G memory for the final merge

MAPREDUCE-6549: Multibyte delimiters with LineRecordReader cause duplicate records

YARN-2336: Fair scheduler REST api returns a missing '[' bracket JSON for deep queue tree

YARN-1050: Document the Fair Scheduler REST API

YARN-3464: Race condition in LocalizerRunner kills localizer before localizing all resources

YARN-4041: Slow delegation token renewal can severely prolong RM recovery

YARN-4347: Resource manager fails with Null pointer exception

MAPREDUCE-6284: Add Task Attempt State API to MapReduce Application Master REST API

MAPREDUCE-6316: Task Attempt List entries should link to the task overview

MAPREDUCE-6364: Add a "Kill" link to Task Attempts pageAdd a "Kill" link to Task Attempts page

MAPREDUCE-6405: NullPointerException in App Attempts page

MAPREDUCE-6419: JobHistoryServer doesn't sort properly based on Job ID when Job id's exceed 9999

MAPREDUCE-5649: Reduce cannot use more than 2G memory for the final merge