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  1. Improvement HDFS-6369
    Document that BlockReader#available() can return more bytes than are remaining in the block
  2. Improvement HDFS-6356
    Fix typo in DatanodeLayoutVersion
  3. Improvement HDFS-6463
    Clarify behavior of AclStorage#createFsPermissionForExtendedAcl in comments.
  4. Bug HDFS-6461
    Use Time#monotonicNow to compute duration in DataNode#shutDown
  5. Bug HDFS-6237
    TestDFSShell#testGet fails on Windows due to invalid file system path.
  6. Improvement HDFS-6558
    Missing '\n' in the description of dfsadmin -rollingUpgrade
  7. Bug HDFS-6493
    Change dfs.namenode.startup.delay.block.deletion to second instead of millisecond
  8. Bug HDFS-6409
    Fix typo in log message about NameNode layout version upgrade.
  9. Bug HDFS-6552
    add DN storage to a BlockInfo will not replace the different storage from same DN
  10. Improvement HDFS-6202
    Replace direct usage of ProxyUser Constants with function
  11. Test HDFS-6287
    Add vecsum test of libhdfs read access times
  12. Bug HDFS-6288
    DFSInputStream Pread doesn't update ReadStatistics
  13. Test HDFS-6257
    TestCacheDirectives#testExceedsCapacity fails occasionally
  14. Improvement HDFS-6396
    Remove support for ACL feature from INodeSymlink
  15. Improvement HDFS-6528
    Add XAttrs to TestOfflineImageViewer
  16. Improvement HDFS-6529
    Trace logging for RemoteBlockReader2 to identify remote datanode and file being read
  17. Improvement HDFS-6282
    re-add testIncludeByRegistrationName
  18. Bug HDFS-6399
    Add note about setfacl in HDFS permissions guide
  19. Test HDFS-6265
    Prepare HDFS codebase for JUnit 4.11.
  20. Improvement HDFS-6268
    Better sorting in NetworkTopology#pseudoSortByDistance when no local node is found
  21. Bug HDFS-6238
    TestDirectoryScanner leaks file descriptors.
  22. Bug HDFS-6251
    Update HDFS calls to ProxyUsers#authorize.
  23. Bug HDFS-6559
    Fix wrong option "dfsadmin -rollingUpgrade start" in the document
  24. Bug HDFS-6443
    Fix MiniQJMHACluster related test failures
  25. Bug HDFS-6415
    Missing null check in FSImageSerialization#writePermissionStatus()
  26. Bug HDFS-6572
    Add an option to the NameNode that prints the software and on-disk image versions
  27. Improvement HDFS-6442
    Fix TestEditLogAutoroll and TestStandbyCheckpoints failure caused by port conficts
  28. Bug HDFS-6497
    Make TestAvailableSpaceVolumeChoosingPolicy deterministic
  29. Improvement HDFS-6503
    Fix typo of DFSAdmin restoreFailedStorage
  30. Improvement HDFS-6090
    Use MiniDFSCluster.Builder instead of deprecated constructors
  31. Bug HDFS-6112
    NFS Gateway docs are incorrect for allowed hosts configuration
  32. Improvement HDFS-6007
    Update documentation about short-circuit local reads
  33. Sub-task HDFS-5975
    Create an option to specify a file path for OfflineImageViewer
  34. Sub-task HDFS-5865
    Update OfflineImageViewer document
  35. Bug HDFS-5591
    Checkpointing should use monotonic time when calculating period
  36. Improvement HDFS-5381
    ExtendedBlock#hashCode should use both blockId and block pool ID
  37. Test HDFS-5409
    TestOfflineEditsViewer#testStored fails on Windows due to CRLF line endings in editsStored.xml from git checkout
  38. Bug HDFS-6612
    MiniDFSNNTopology#simpleFederatedTopology(int) always hardcode nameservice ID
  39. Test HDFS-6614
    shorten TestPread run time with a smaller retry timeout setting
  40. Bug HDFS-6610
    TestShortCircuitLocalRead tests sometimes timeout on slow machines
  41. Improvement HDFS-6603
    Add XAttr with ACL test
  42. Improvement HDFS-6403
    Add metrics for log warnings reported by JVM pauses
  43. Improvement HDFS-6334
    Client failover proxy provider for IP failover based NN HA
  44. New Feature HDFS-6281
    Provide option to use the NFS Gateway without having to use the Hadoop portmapper
  45. Sub-task HDFS-6240
    WebImageViewer returns 404 if LISTSTATUS to an empty directory
  46. Bug HDFS-6243
    HA NameNode transition to active or shutdown may leave lingering image transfer thread.
  47. Bug HDFS-6370
    Web UI fails to display in intranet under IE
  48. Improvement HDFS-6256
    Clean up ImageVisitor and SpotCheckImageVisitor
  49. Bug HDFS-6214
    Webhdfs has poor throughput for files >2GB
  50. Bug HDFS-6222
    Remove background token renewer from webhdfs
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