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  1. Bug HDFS-14464
    Remove unnecessary log message from DFSInputStream
  2. Sub-task HDFS-13289
    RBF: TestConnectionManager#testCleanup() test case need correction
  3. Test HDFS-13337
    Backport HDFS-4275 to branch-2.9
  4. Bug HDFS-14407
    Fix misuse of SLF4j logging API in DatasetVolumeChecker#checkAllVolumes
  5. Sub-task HDFS-13733
    RBF: Add Web UI configurations and descriptions to RBF document
  6. Improvement HDFS-14392
    Backport HDFS-9787 to branch-2
  7. Improvement HDFS-14391
    Backport HDFS-9659 to branch-2
  8. Bug HDFS-14397
    Backport HADOOP-15684 to branch-2
  9. Bug HDFS-12924
    Port HDFS-12881 to branch-2 (Output streams closed with IOUtils suppressing write errors)
  10. Bug HDFS-10618
    TestPendingReconstruction#testPendingAndInvalidate is flaky due to race condition
  11. Bug HDFS-10477
    Stop decommission a rack of DataNodes caused NameNode fail over to standby
  12. Improvement HDFS-13644
    Backport HDFS-10376 to branch-2
  13. Sub-task HDFS-13307
    RBF: Improve the use of setQuota command
  14. Improvement HDFS-13418
    NetworkTopology should be configurable when enable DFSNetworkTopology
  15. Improvement HDFS-14667
    Backport [HDFS-14403] "Cost-based FairCallQueue" to branch-2
  16. Sub-task HDFS-14822
    [SBN read] Revisit GlobalStateIdContext locking when getting server state id
  17. Bug HDFS-14793
    BlockTokenSecretManager should LOG block token range it operates on.
  18. Sub-task HDFS-13848
    Refactor NameNode failover proxy providers
  19. Improvement HDFS-13492
    Limit httpfs binds to certain IP addresses in branch-2
  20. Sub-task HDFS-13528
    RBF: If a directory exceeds quota limit then quota usage is not refreshed for other mount entries
  21. Sub-task HDFS-13250
    RBF: Router to manage requests across multiple subclusters
  22. Improvement HDFS-13272
    DataNodeHttpServer to have configurable HttpServer2 threads
  23. Bug HDFS-13115
    In getNumUnderConstructionBlocks(), ignore the inodeIds for which the inodes have been deleted
  24. Improvement HDFS-13821
    RBF: Add dfs.federation.router.mount-table.cache.enable so that users can disable cache
  25. Sub-task HDFS-13750
    RBF: Router ID in RouterRpcClient is always null
  26. Sub-task HDFS-14034
    Support getQuotaUsage API in WebHDFS
  27. Task HDFS-14510
    Backport HDFS-13087 to branch-2 (Snapshotted encryption zone information should be immutable)
  28. Bug HDFS-14514
    Actual read size of open file in encryption zone still larger than listing size even after enabling HDFS-11402 in Hadoop 2
  29. Improvement HDFS-14502
    keepResults option in NNThroughputBenchmark should call saveNamespace()
  30. Task HDFS-14496
    Backport HDFS-13056 into branch-2.8/2.9/2
  31. Sub-task HDFS-14785
    [SBN read] Change client logging to be less aggressive
  32. Task HDFS-14725
    Backport HDFS-12914 to branch-2 (Block report leases cause missing blocks until next report)
  33. Improvement HDFS-14707
    Add JAVA_LIBRARY_PATH to HTTPFS startup options in branch-2
  34. Improvement HDFS-14696
    Backport HDFS-11273 to branch-2 (Move TransferFsImage#doGetUrl function to a Util class)
  35. Improvement HDFS-11273
    Move TransferFsImage#doGetUrl function to a Util class
  36. Bug HDFS-12985
    NameNode crashes during restart after an OpenForWrite file present in the Snapshot got deleted
  37. Improvement HDFS-13831
    Make block increment deletion number configurable
  38. Bug HDFS-13768
    Adding replicas to volume map makes DataNode start slowly
  39. Bug HDFS-15290
    NPE in HttpServer during NameNode startup
  40. Bug HDFS-14429
    Block remain in COMMITTED but not COMPLETE caused by Decommission
  41. Improvement HDFS-13541
    NameNode Port based selective encryption
  42. Bug HDFS-14500
    NameNode StartupProgress continues to report edit log segments after the LOADING_EDITS phase is finished
  43. Bug HDFS-14399
    Backport HDFS-10536 to branch-2
  44. Bug HDFS-13100
    Handle IllegalArgumentException when GETSERVERDEFAULTS is not implemented in webhdfs.
  45. Sub-task HDFS-13299
    RBF : Fix compilation error in branch-2 (TestMultipleDestinationResolver)
  46. Bug HDFS-13596
    NN restart fails after RollingUpgrade from 2.x to 3.x
  47. Bug HDFS-14551
    NN throws NPE if downgrade it during rolling upgrade from 3.x to 2.x
  48. Bug HDFS-14726
    Fix JN incompatibility issue in branch-2 due to backport of HDFS-10519
  49. Bug HDFS-14509
    DN throws InvalidToken due to inequality of password when upgrade NN 2.x to 3.x
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