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  1. Bug HDFS-16372
    RefreshNodes should not use System.out but System.err when exceptions occur
  2. Wish HDFS-16226
    Generate locatedBlocks can use binary search to find curBlk
  3. Test HDFS-16212
    Flaky when creating multiple export point
  4. Task HDFS-15926
    Removed duplicate dependency of hadoop-annotations
  5. Task HDFS-15895
    DFSAdmin#printOpenFiles has redundant String#format usage
  6. Bug HDFS-15485
    Fix outdated properties of JournalNode when performing rollback
  7. Wish HDFS-15951
    Remove unused parameters in NameNodeProxiesClient
  8. Wish HDFS-15991
    Add location into datanode info for NameNodeMXBean
  9. New Feature HDFS-15970
    Print network topology on the web
  10. Improvement HDFS-15295
    AvailableSpaceBlockPlacementPolicy should use chooseRandomWithStorageTypeTwoTrial() for better performance.
  11. Improvement HDFS-15338
    listOpenFiles() should throw InvalidPathException in case of invalid paths
  12. Improvement HDFS-15821
    Add metrics for in-service datanodes
  13. Improvement HDFS-15967
    Improve the log for Short Circuit Local Reads
  14. Test HDFS-15898
    Test case TestOfflineImageViewer fails
  15. Sub-task HDFS-15762
    TestMultipleNNPortQOP#testMultipleNNPortOverwriteDownStream fails intermittently
  16. Sub-task HDFS-15847
    create client protocol: add ecPolicyName & storagePolicy param to debug statement string
  17. Wish HDFS-15870
    Remove unused configuration dfs.namenode.stripe.min
  18. Wish HDFS-15906
    Close FSImage and FSNamesystem after formatting is complete
  19. Wish HDFS-15892
    Add metric for editPendingQ in FSEditLogAsync
  20. Sub-task HDFS-15613
    RBF: Router FSCK fails after HDFS-14442
  21. Sub-task HDFS-15657
    RBF: TestRouter#testNamenodeHeartBeatEnableDefault fails by BindException
  22. Sub-task HDFS-15620
    RBF: Fix test failures after HADOOP-17281
  23. Bug HDFS-15320
    StringIndexOutOfBoundsException in HostRestrictingAuthorizationFilter
  24. Improvement HDFS-15931
    Fix non-static inner classes for better memory management
  25. Sub-task HDFS-15680
    Disable Broken Azure Junits
  26. Sub-task HDFS-15596
    ViewHDFS#create(f, permission, cflags, bufferSize, replication, blockSize, progress, checksumOpt) should not be restricted to DFS only.
  27. Sub-task HDFS-15940
    Some tests in TestBlockRecovery are consistently failing
  28. Improvement HDFS-15911
    Provide blocks moved count in Balancer iteration result
  29. Sub-task HDFS-15836
    RBF: Fix contract tests after HADOOP-13327
  30. Bug HDFS-15499
    Clean up httpfs/pom.xml to remove aws-java-sdk-s3 exclusion
  31. Bug HDFS-15561
    RBF: Fix NullPointException when start dfsrouter
  32. Sub-task HDFS-15492
    Make trash root inside each snapshottable directory
  33. Bug HDFS-15977
    Call explicit_bzero only if it is available
  34. Task HDFS-15989
    Split TestBalancer into two classes
  35. Improvement HDFS-16007
    Deserialization of ReplicaState should avoid throwing ArrayIndexOutOfBoundsException
  36. Improvement HDFS-16117
    Add file count info in audit log to record the file count for delete and getListing RPC request to assist user trouble shooting when RPC cost is increasing
  37. Improvement HDFS-16431
    Truncate CallerContext in client side
  38. Improvement HDFS-16308
    Enable get command run with multi-thread.
  39. Bug HDFS-16322
    The NameNode implementation of ClientProtocol.truncate(...) can cause data loss.
  40. Bug HDFS-16288
    Native Test Case #35 Fails in RHEL 8.4
  41. Improvement HDFS-15406
    Improve the speed of Datanode Block Scan
  42. Improvement HDFS-14999
    Avoid Potential Infinite Loop in DFSNetworkTopology
  43. Improvement HDFS-15358
    RBF: Unify router datanode UI with namenode datanode UI
  44. Improvement HDFS-15404
    ShellCommandFencer should expose info about source
  45. Improvement HDFS-15694
    Avoid calling UpdateHeartBeatState inside DataNodeDescriptor
  46. Improvement HDFS-15569
    Speed up the Storage#doRecover during datanode rolling upgrade
  47. Improvement HDFS-15826
    Solve the problem of incorrect progress of delegation tokens when loading FsImage
  48. Bug HDFS-15252
    HttpFS: setWorkingDirectory should not accept invalid paths
  49. Bug HDFS-15270
    Account for *env == NULL in hdfsThreadDestructor
  50. Bug HDFS-15332
    Quota Space consumed was wrong in truncate with Snapshots
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