1. Bug HDFS-12219
    Javadoc for FSNamesystem#getMaxObjects is incorrect
  2. Task HDFS-12944
    Update NOTICE for AssertJ dependency
  3. Bug HDFS-12930
    Remove the extra space in HdfsImageViewer.md
  4. Improvement HDFS-12877
    Add open(PathHandle) with default buffersize
  5. Improvement HDFS-12780
    Fix spelling mistake in DistCpUtils.java
  6. Improvement HDFS-13175
    Add more information for checking argument in DiskBalancerVolume
  7. Bug HDFS-12271
    Incorrect statement in Downgrade section of HDFS Rolling Upgrade document
  8. Test HDFS-13649
    Randomize baseDir for MiniDFSCluster in TestReconstructStripedFile and TestReconstructStripedFileWithRandomECPolicy
  9. Bug HDFS-13676
    TestEditLogRace fails on Windows
  10. Bug HDFS-13673
    TestNameNodeMetrics fails on Windows
  11. Bug HDFS-12963
    Error log level in ShortCircuitRegistry#removeShm
  12. Improvement HDFS-12604
    StreamCapability enums are not displayed in javadoc
  13. Sub-task HDFS-13099
    RBF: Use the ZooKeeper as the default State Store
  14. Bug HDFS-12974
    Exception message is not printed when creating an encryption zone fails with AuthorizationException
  15. Bug HDFS-12959
    Fix TestOpenFilesWithSnapshot redundant configurations
  16. Sub-task HDFS-12858
    RBF: Add router admin commands usage in HDFS commands reference doc
  17. Sub-task HDFS-12835
    RBF: Fix Javadoc parameter errors
  18. Bug HDFS-12695
    Add a link to HDFS router federation document in site.xml
  19. Improvement HDFS-11600
    Refactor TestDFSStripedOutputStreamWithFailure test classes
  20. Improvement HDFS-15371
    Nonstandard characters exist in NameNode.java
  21. Task HDFS-14573
    Backport Standby Read to branch-3
  22. Bug HDFS-13280
    WebHDFS: Fix NPE in get snasphottable directory list call
  23. Sub-task HDFS-13364
    RBF: Support NamenodeProtocol in the Router
  24. Bug HDFS-13271
    WebHDFS: Add constructor in SnapshottableDirectoryStatus with HdfsFileStatus as argument
  25. Sub-task HDFS-13253
    RBF: Quota management incorrect parent-child relationship judgement
  26. Bug HDFS-13249
    Document webhdfs support for getting snapshottable directory list
  27. Improvement HDFS-12516
    Suppress the fsnamesystem lock warning on nn startup
  28. Improvement HDFS-13225
    StripeReader#checkMissingBlocks() 's IOException info is incomplete
  29. Bug HDFS-13190
    Document WebHDFS support for snapshot diff
  30. Improvement HDFS-13218
    Log audit event only used last EC policy name when add multiple policies from file
  31. Improvement HDFS-13493
    Reduce the HttpServer2 thread count on DataNodes
  32. Improvement HDFS-12260
    StreamCapabilities.StreamCapability should be public.
  33. Test HDFS-13106
    Need to exercise all HDFS APIs for EC
  34. Sub-task HDFS-13042
    RBF: Heartbeat Router State
  35. Bug HDFS-13048
    LowRedundancyReplicatedBlocks metric can be negative
  36. Improvement HDFS-12654
    APPEND API call is different in HTTPFS and NameNode REST
  37. Sub-task HDFS-12574
    Add CryptoInputStream to WebHdfsFileSystem read call.
  38. Bug HDFS-12576
    JournalNodes are getting started, even though dfs.namenode.shared.edits.dir is not configured
  39. Bug HDFS-12586
    EZ createZone returns IllegalArgumentException when using protocol in path
  40. Bug HDFS-12681
    Make HdfsLocatedFileStatus a subtype of LocatedFileStatus
  41. Improvement HDFS-12650
    Use slf4j instead of log4j in LeaseManager
  42. Improvement HDFS-12629
    NameNode UI should report total blocks count by type - replicated and erasure coded
  43. Test HDFS-12730
    Verify open files captured in the snapshots across config disable and enable
  44. Bug HDFS-12726
    BlockPlacementPolicyDefault's debugLoggingBuilder may not be logged
  45. Improvement HDFS-12552
    Use slf4j instead of log4j in FSNamesystem
  46. Improvement HDFS-12087
    The error message is not friendly when set a path with the policy not enabled
  47. Improvement HDFS-13014
    Moving logging APIs over to slf4j in hadoop-hdfs-nfs
  48. Sub-task HDFS-12934
    RBF: Federation supports global quota
  49. Bug HDFS-12949
    Fix findbugs warning in ImageWriter.java
  50. Improvement HDFS-13153
    Enable HDFS diskbalancer by default
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