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  1. Bug HDFS-11344
    The default value of the setting dfs.disk.balancer.block.tolerance.percent is different
  2. Bug HDFS-10639
    Fix typos in HDFSDiskbalancer.md
  3. Improvement HDFS-10876
    Dispatcher#dispatch should log IOException stacktrace
  4. Bug HDFS-10835
    Fix typos in httpfs.sh
  5. Sub-task HDFS-11013
    Correct typos in native erasure coding dump code
  6. Bug HDFS-10907
    Fix Erasure Coding documentation
  7. Bug HDFS-11271
    Typo in NameNode UI
  8. Improvement HDFS-11088
    Quash unnecessary safemode WARN message during NameNode startup
  9. Improvement HDFS-10868
    Remove stray references to DFS_HDFS_BLOCKS_METADATA_ENABLED
  10. Sub-task HDFS-10562
    DiskBalancer: update documentation on how to report issues and debug
  11. Improvement HDFS-10707
    Replace org.apache.commons.io.Charsets with java.nio.charset.StandardCharsets
  12. Sub-task HDFS-10553
    DiskBalancer: Rename Tools/DiskBalancer class to Tools/DiskBalancerCLI
  13. Bug HDFS-10650
    DFSClient#mkdirs and DFSClient#primitiveMkdir should use default directory permission
  14. Bug HDFS-10455
    Logging the username when deny the setOwner operation
  15. Improvement HDFS-10683
    Make class Token$PrivateToken private
  16. Bug HDFS-10990
    TestPendingInvalidateBlock should wait for IBRs
  17. Sub-task HDFS-10900
    DiskBalancer: Complete the documents for the report command
  18. Sub-task HDFS-10949
    DiskBalancer: deprecate TestDiskBalancer#setVolumeCapacity
  19. Improvement HDFS-11228
    Remove deprecated FileSystem#getDefault* and getServerDefault methods that don't take a Path argument
  20. Sub-task HDFS-10725
    Caller context should always be constructed by a builder
  21. Improvement HDFS-10908
    Improve StripedBlockReader#createBlockReader error logging
  22. Bug HDFS-11261
    Document missing NameNode metrics
  23. Improvement HDFS-11064
    Mention the default NN rpc ports in hdfs-default.xml
  24. Sub-task HDFS-11079
    Accelerate TestQuotaByStorageType using shared MiniDFSCluster
  25. Sub-task HDFS-11122
    TestDFSAdmin#testReportCommand fails due to timed out
  26. Bug HDFS-9935
    Remove LEASE_{SOFTLIMIT,HARDLIMIT}_PERIOD and unused import from HdfsServerConstants
  27. Improvement HDFS-10489
    Deprecate dfs.encryption.key.provider.uri for HDFS encryption zones
  28. Bug HDFS-10960
    TestDataNodeHotSwapVolumes#testRemoveVolumeBeingWritten fails at disk error verification after volume remove
  29. Sub-task HDFS-11113
    Document dfs.client.read.striped configuration in hdfs-default.xml
  30. Bug HDFS-11095
    BlockManagerSafeMode should respect extension period default config value (30s)
  31. Improvement HDFS-10909
    De-duplicate code in ErasureCodingWorker#initializeStripedReadThreadPool and DFSClient#initThreadsNumForStripedReads
  32. Improvement HDFS-5684
    Annotate o.a.h.fs.viewfs.ViewFileSystem.MountPoint as VisibleForTesting
  33. Bug HDFS-10457
    DataNode should not auto-format block pool directory if VERSION is missing
  34. Improvement HDFS-11080
    Update HttpFS to use ConfigRedactor
  35. Bug HDFS-10376
    Enhance setOwner testing
  36. Sub-task HDFS-10368
    Erasure Coding: Deprecate replication-related config keys
  37. Sub-task HDFS-10599
    DiskBalancer: Execute CLI via Shell
  38. Bug HDFS-10697
    Erasure Code(6:3) can not work, using get fs shell when 2 datanode down
  39. Bug HDFS-11287
    Storage class member storageDirs should be private to avoid unprotected access by derived classes
  40. Improvement HDFS-11275
    Check groupEntryIndex and throw a helpful exception on failures when removing ACL.
  41. New Feature HDFS-10584
    Allow long-running Mover tool to login with keytab
  42. Sub-task HDFS-11031
    Add additional unit test for DataNode startup behavior when volumes fail
  43. Sub-task HDFS-10976
    Report erasure coding policy of EC files in Fsck
  44. Improvement HDFS-10970
    Update jackson from 1.9.13 to 2.x in hadoop-hdfs
  45. Sub-task HDFS-11038
    DiskBalancer: support running multiple commands in single test
  46. Sub-task HDFS-10968
    BlockManager#isInNewRack should consider decommissioning nodes
  47. Sub-task HDFS-10916
    Switch from "raw" to "system" xattr namespace for erasure coding policy
  48. Improvement HDFS-10877
    Make RemoteEditLogManifest.committedTxnId optional in Protocol Buffers
  49. Task HDFS-11145
    Implement getTrashRoot() for ViewFileSystem
  50. Task HDFS-11058
    Implement 'hadoop fs -df' command for ViewFileSystem
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