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  1. Improvement HDFS-6006
    Remove duplicate code in FSNameSystem#getFileInfo
  2. Bug HDFS-6028
    Print clearer error message when user attempts to delete required mask entry from ACL.
  3. Sub-task HDFS-5938
    Make BlockReaderFactory#BlockReaderPeer a static class
  4. Improvement HDFS-6069
    Quash stack traces when ACLs are disabled
  5. Bug HDFS-6078
    TestIncrementalBlockReports is flaky
  6. Bug HDFS-6117
    Print file path information in FileNotFoundException
  7. Bug HDFS-6096
    TestWebHdfsTokens may timeout
  8. Improvement HDFS-5979
    Typo and logger fix for fsimage PB code
  9. Bug HDFS-5856
    DataNode.checkDiskError might throw NPE
  10. Bug HDFS-5959
    Fix typo at section name in FSImageFormatProtobuf.java
  11. Test HDFS-5882
    TestAuditLogs is flaky
  12. Sub-task HDFS-5942
    Fix javadoc in OfflineImageViewer
  13. Bug HDFS-5880
    Fix a typo at the title of HDFS Snapshots document
  14. Bug HDFS-5981
    PBImageXmlWriter generates malformed XML
  15. Bug HDFS-5742
    DatanodeCluster (mini cluster of DNs) fails to start
  16. Bug HDFS-5492
    Port HDFS-2069 (Incorrect default trash interval in the docs) to trunk
  17. Test HDFS-6063
    TestAclCLI fails intermittently when running test 24: copyFromLocal
  18. Improvement HDFS-4911
    Reduce PeerCache timeout to be commensurate with dfs.datanode.socket.reuse.keepalive
  19. Bug HDFS-8240
    During hdfs client is writing small file, missing block showed in namenode web when ha switch
  20. Bug HDFS-6198
    DataNode rolling upgrade does not correctly identify current block pool directory and replace with trash on Windows.
  21. Bug HDFS-6140
    WebHDFS cannot create a file with spaces in the name after HA failover changes.
  22. Bug HDFS-6089
    Standby NN while transitioning to active throws a connection refused error when the prior active NN process is suspended
  23. Improvement HDFS-6085
    Improve CacheReplicationMonitor log messages a bit
  24. Sub-task HDFS-6086
    Fix a case where zero-copy or no-checksum reads were not allowed even when the block was cached
  25. Bug HDFS-6077
    running slive with webhdfs on secure HA cluster fails with unkown host exception
  26. Sub-task HDFS-6046
    add dfs.client.mmap.enabled
  27. Bug HDFS-6039
    Uploading a File under a Dir with default acls throws "Duplicated ACLFeature"
  28. Bug HDFS-6127
    WebHDFS tokens cannot be renewed in HA setup
  29. Sub-task HDFS-6124
    Add final modifier to class members
  30. Improvement HDFS-6120
    Fix and improve safe mode log messages
  31. Bug HDFS-6107
    When a block can't be cached due to limited space on the DataNode, that block becomes uncacheable
  32. Bug HDFS-6111
    Avoid duplicate entries in Block Scan verification logs
  33. Bug HDFS-6105
    NN web UI for DN list loads the same jmx page multiple times.
  34. Bug HDFS-6106
    Reduce default for dfs.namenode.path.based.cache.refresh.interval.ms
  35. Bug HDFS-6100
    DataNodeWebHdfsMethods does not failover in HA mode
  36. Bug HDFS-6099
    HDFS file system limits not enforced on renames.
  37. Bug HDFS-6097
    zero-copy reads are incorrectly disabled on file offsets above 2GB
  38. Sub-task HDFS-5986
    Capture the number of blocks pending deletion on namenode webUI
  39. Sub-task HDFS-5973
    add DomainSocket#shutdown method
  40. Bug HDFS-5977
    FSImageFormatPBINode does not respect "-renameReserved" upgrade flag
  41. Bug HDFS-5859
    DataNode#checkBlockToken should check block tokens even if security is not enabled
  42. Sub-task HDFS-6036
    Forcibly timeout misbehaving DFSClients that try to do no-checksum reads that extend too long
  43. Bug HDFS-6033
    PBImageXmlWriter incorrectly handles processing cache directives
  44. Bug HDFS-5895
    HDFS cacheadmin -listPools has exit_code of 1 when the command returns 0 result.
  45. Bug HDFS-5941
    add dfs.namenode.secondary.https-address and dfs.namenode.secondary.https-address in hdfs-default.xml
  46. Sub-task HDFS-5940
    Minor cleanups to ShortCircuitReplica, FsDatasetCache, and DomainSocketWatcher
  47. Test HDFS-5936
    MiniDFSCluster does not clean data left behind by SecondaryNameNode.
  48. Bug HDFS-5870
    The legacy local reader stops working on block token expiration
  49. Sub-task HDFS-5868
    Make hsync implementation pluggable
  50. Sub-task HDFS-5866
    '-maxSize' and '-step' option fail in OfflineImageViewer
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