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  1. Sub-task HDFS-2174
    Complete decoupling of failure states between edits and image dirs
  2. Sub-task HDFS-2173
    saveNamespace should not throw IOE when only one storage directory fails to write VERSION file
  3. Sub-task HDFS-2172
    1073: address findbugs/javadoc warnings
  4. Sub-task HDFS-2170
    1073: Address remaining TODOs
  5. Sub-task HDFS-2169
    1073: clean up TestCheckpoint and remove TODOs
  6. Sub-task HDFS-2168
    1073: Reenable TestEditLog.testFailedOpen and fix exposed bug
  7. Sub-task HDFS-2160
    1073: fix CreateEditsLog test tool in branch
  8. Sub-task HDFS-2136
    1073: Fault injection for StorageDirectory failures during read/write of FSImage/Edits files
  9. Sub-task HDFS-2135
    1073: fix regression of HDFS-1955 in branch
  10. Sub-task HDFS-2133
    1073: address remaining TODOs and pre-merge cleanup
  11. Sub-task HDFS-2123
    1073: Checkpoint interval should be based on txn count, not size
  12. Sub-task HDFS-2104
    1073: Add a flag to 2NN to format its checkpoint dirs on startup
  13. Sub-task HDFS-2102
    1073: Zero pad edits filename to make them lexically sortable
  14. Sub-task HDFS-2101
    1073: update remaining unit tests to new storage filenames
  15. Sub-task HDFS-2099
    1073: consider adding END_LOG_SEGMENT txn when finalizing inprogress logs at startup
  16. Sub-task HDFS-2093
    1073: Handle case where an entirely empty log is left during NN crash
  17. Sub-task HDFS-2088
    1073: Move edits log archiving logic into FSEditLog/JournalManager
  18. Sub-task HDFS-2085
    1073: finalize inprogress edit logs at startup
  19. Sub-task HDFS-2079
    1073: create an escape hatch to ignore startup consistency problems
  20. Sub-task HDFS-2078
    1073: NN should not clear storage directory when restoring removed storage
  21. Sub-task HDFS-2077
    1073: address checkpoint upload when one of the storage dirs is failed
  22. Sub-task HDFS-2074
    1073: determine edit log validity by truly reading and validating transactions
  23. Sub-task HDFS-2048
    1073: Improve upgrade tests from 0.22
  24. Sub-task HDFS-2047
    1073: Improve TestNamespace and TestEditLog in 1073 branch
  25. Sub-task HDFS-2027
    1073: Image inspector should return finalized logs before unfinalized logs
  26. Sub-task HDFS-2026
    1073: 2NN needs to handle case of reformatted NN better
  27. Sub-task HDFS-2018
    1073: Move all journal stream management code into one place
  28. Sub-task HDFS-2016
    1073: remove/archive unneeded/old storage files
  29. Sub-task HDFS-2015
    1073: Remove checkpointTxId from VERSION file
  30. Sub-task HDFS-2010
    Clean up and test behavior under failed edit streams
  31. Sub-task HDFS-2001
    HDFS-1073: Kill previous.checkpoint, lastcheckpoint.tmp directories
  32. Sub-task HDFS-1997
    Image transfer process misreports client side exceptions
  33. Sub-task HDFS-1994
    Fix race conditions when running two rapidly checkpointing 2NNs
  34. Sub-task HDFS-1993
    TestCheckpoint needs to clean up between cases
  35. Sub-task HDFS-1992
    Remove vestiges of NNStorageListener
  36. Sub-task HDFS-1991
    HDFS-1073: Some refactoring of 2NN to easier share code with BN and CN
  37. Sub-task HDFS-1987
    HDFS-1073: Test for 2NN downloading image is not running
  38. Sub-task HDFS-1985
    HDFS-1073: Cleanup in image transfer servlet
  39. Sub-task HDFS-1984
    1073: Enable multiple checkpointers to run simultaneously
  40. Sub-task HDFS-1979
    HDFS-1073: Fix backupnode for new edits/image layout
  41. Sub-task HDFS-1930
    TestDFSUpgrade failing in HDFS-1073 branch
  42. Sub-task HDFS-1926
    Remove references to StorageDirectory from JournalManager interface
  43. Sub-task HDFS-1896
    Additional QA tasks for Edit Log branch
  44. Sub-task HDFS-1894
    Add constants for LAYOUT_VERSIONs in edits log branch
  45. Sub-task HDFS-1893
    Change edit logs and images to be named based on txid
  46. Sub-task HDFS-1892
    Update HDFS-1073 branch to deal with OP_INVALID-filled preallocation
  47. Sub-task HDFS-1859
    Add some convenience functions to iterate over edit log streams
  48. Sub-task HDFS-1858
    Add state management variables to FSEditLog
  49. Sub-task HDFS-1815
    Add migration tests from old-format to new-format storage
  50. Sub-task HDFS-1801
    Remove use of timestamps to identify checkpoints and logs
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