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  1. Improvement YARN-4639
    Remove dead code in TestDelegationTokenRenewer added in YARN-3055
  2. Bug YARN-6743
    yarn.resourcemanager.zk-max-znode-size.bytes description needs spaces in yarn-default.xml
  3. Bug YARN-5963
    Spelling errors in logging and exceptions for node manager, client, web-proxy, common, and app history code
  4. Bug YARN-4551
    Address the duplication between StatusUpdateWhenHealthy and StatusUpdateWhenUnhealthy transitions
  5. Test YARN-4717
    TestResourceLocalizationService.testPublicResourceInitializesLocalDir fails Intermittently due to IllegalArgumentException from cleanup
  6. Improvement YARN-5551
    Ignore file backed pages from memory computation when smaps is enabled
  7. Sub-task YARN-5416
    TestRMRestart#testRMRestartWaitForPreviousAMToFinish failed intermittently due to not wait SchedulerApplicationAttempt to be stopped
  8. Bug YARN-7285
    ContainerExecutor always launches with priorities due to yarn-default property
  9. Improvement YARN-7358
    TestZKConfigurationStore and TestLeveldbConfigurationStore should explicitly set capacity scheduler
  10. Task YARN-7317
    Fix overallocation resulted from ceiling in LocalityMulticastAMRMProxyPolicy
  11. Improvement YARN-6208
    Improve the log when FinishAppEvent sent to the NodeManager which didn't run the application
  12. Bug YARN-6110
    Fix opportunistic containers documentation
  13. Task YARN-7343
    Add a junit test for ContainerScheduler recovery
  14. Improvement YARN-4996
    Make TestNMReconnect.testCompareRMNodeAfterReconnect() scheduler agnostic, or better yet parameterized
  15. New Feature YARN-1492
    truly shared cache for jars (jobjar/libjar)
  16. New Feature YARN-679
    add an entry point that can start any Yarn service
  17. Sub-task YARN-4205
    Add a service for monitoring application life time out
  18. Improvement YARN-3692
    Allow REST API to set a user generated message when killing an application
  19. Sub-task YARN-4676
    Automatic and Asynchronous Decommissioning Nodes Status Tracking
  20. Bug YARN-4983
    JVM and UGI metrics disappear after RM is once transitioned to standby mode
  21. Bug YARN-4648
    Move preemption related tests from TestFairScheduler to TestFairSchedulerPreemption
  22. Improvement YARN-4647
    Make RegisterNodeManagerRequestPBImpl thread-safe
  23. Bug YARN-4885
    Aggregate container utilization can be negative
  24. Improvement YARN-4753
    Use doxia macro to generate in-page TOC of YARN site documentation
  25. Bug YARN-4752
    FairScheduler should preempt for a ResourceRequest and all preempted containers should be on the same node
  26. Sub-task YARN-3480
    Recovery may get very slow with lots of services with lots of app-attempts
  27. Bug YARN-4594
    container-executor fails to remove directory tree when chmod required
  28. Sub-task YARN-4526
    Make SystemClock singleton so AppSchedulingInfo could use it
  29. Bug YARN-4524
    Cleanup AppSchedulingInfo
  30. Bug YARN-4559
    Make leader elector and zk store share the same curator client
  31. Bug YARN-4866
    FairScheduler: AMs can consume all vcores leading to a livelock when using FAIR policy
  32. Bug YARN-4764
    Application submission fails when submitted queue is not available in scheduler xml
  33. Improvement YARN-4792
    FairScheduler should do sanity checks on its configuration
  34. Bug YARN-4862
    Handle duplicate completed containers in RMNodeImpl
  35. Improvement YARN-4769
    Add support for CSRF header in the dump capacity scheduler logs and kill app buttons in RM web UI
  36. Bug YARN-4906
    Capture container start/finish time in container metrics
  37. Bug YARN-4816
    SystemClock API broken in 2.9.0
  38. Sub-task YARN-4822
    Refactor existing Preemption Policy of CS for easier adding new approach to select preemption candidates
  39. Bug YARN-4810
    NM applicationpage cause internal error 500
  40. Sub-task YARN-4807
    MockAM#waitForState sleep duration is too long
  41. Sub-task YARN-4805
    Don't go through all schedulers in ParameterizedTestBase
  42. Bug YARN-4812
    TestFairScheduler#testContinuousScheduling fails intermittently
  43. Sub-task YARN-4811
    Generate histograms in ContainerMetrics for actual container resource usage
  44. Sub-task YARN-3637
    Handle localization sym-linking correctly at the YARN level
  45. Improvement YARN-4438
    Implement RM leader election with curator
  46. Sub-task YARN-2037
    Add work preserving restart support for Unmanaged AMs
  47. Sub-task YARN-2571
    RM to support YARN registry
  48. New Feature YARN-2877
    Extend YARN to support distributed scheduling
  49. Sub-task YARN-1047
    Expose # of pre-emptions as a queue counter
  50. Sub-task YARN-3141
    Improve locks in SchedulerApplicationAttempt/FSAppAttempt/FiCaSchedulerApp
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