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[HDFS-6991] Notify NN of evicted block before deleting it from RAM disk - HDFS - [issue]
...When evicting a block from RAM disk to persistent storage, the DN should notify the NN of the persistent replica before deleting the replica from RAM disk. Else there can be a window of time...
http://issues.apache.org/jira/browse/HDFS-6991    Author: Arpit Agarwal, 2014-09-04, 21:28
[HDFS-6120] Fix and improve safe mode log messages - HDFS - [issue]
...In HA mode the SBN can enter safe-mode extension and stay there even after the extension period has elapsed but continue to return the safemode message stating that "The threshold has been r...
http://issues.apache.org/jira/browse/HDFS-6120    Author: Arpit Agarwal, 2014-09-04, 02:15
[HDFS-4905] Add appendToFile command to "hdfs dfs" - HDFS - [issue]
...A "hdfs dfs -appendToFile..." option would be quite useful for quick testing....
http://issues.apache.org/jira/browse/HDFS-4905    Author: Arpit Agarwal, 2014-09-04, 00:49
[HDFS-6930] Improve replica eviction from RAM disk - HDFS - [issue]
...The current replica eviction scheme is inefficient since it performs multiple file operations in the context of block allocation.A better implementation would be asynchronous eviction when f...
http://issues.apache.org/jira/browse/HDFS-6930    Author: Arpit Agarwal, 2014-09-03, 21:54
[HDFS-6830] BlockInfo.addStorage fails when DN changes the storage for a block replica - HDFS - [issue]
...The call to removeStorageInfo is wrong because the block is still in the DatanodeStorage's list of blocks and the callee does not expect it to be.      } else { &nbs...
http://issues.apache.org/jira/browse/HDFS-6830    Author: Arpit Agarwal, 2014-09-03, 20:50
[HDFS-6921] Add LazyPersist flag to FileStatus - HDFS - [issue]
...A new flag will be added to FileStatus to indicate that a file can be lazily persisted to disk i.e. trading reduced durability for better write performance....
http://issues.apache.org/jira/browse/HDFS-6921    Author: Arpit Agarwal, 2014-09-02, 22:37
[HDFS-6975] Consider removing heavyweight synchronization for FsDataset operations - HDFS - [issue]
...Post HDFS-6482, I think we can remove the requirement for most operations to synchronize on the FsDatasetImpl object lock. Especially filesystem operations need not synchronize since block f...
http://issues.apache.org/jira/browse/HDFS-6975    Author: Arpit Agarwal, 2014-08-29, 23:29
[HDFS-6960] Bugfix in LazyWriter, fix test case and some refactoring - HDFS - [issue]
...LazyWriter has a bug. While saving the replica to disk we would save it under current/lazyPersist/. Instead it should be saved under the appropriate subdirectory e.g. current/lazyPersist/sub...
http://issues.apache.org/jira/browse/HDFS-6960    Author: Arpit Agarwal, 2014-08-29, 07:16
[HDFS-6931] Move lazily persisted replicas to finalized directory on DN startup - HDFS - [issue]
...On restart the DN should move replicas from the current/lazyPersist/ directory to current/finalized. Duplicate replicas of the same block should be deleted from RAM disk....
http://issues.apache.org/jira/browse/HDFS-6931    Author: Arpit Agarwal, 2014-08-29, 07:16
[HDFS-6860] BlockStateChange logs are too noisy - HDFS - [issue]
...Block State Change logs are too noisy at the default INFO level and affect NN performance on busy clusters.Most of these state changes can be logged at debug level instead....
http://issues.apache.org/jira/browse/HDFS-6860    Author: Arpit Agarwal, 2014-08-29, 00:11
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