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[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
[HDFS-6929] NN periodically unlinks lazy persist files with missing replicas from namespace - HDFS - [issue]
...Occasional data loss is expected when using the lazy persist flag due to node restarts. The NN will optionally unlink lazy persist files from the namespace to avoid them from showing up as c...
http://issues.apache.org/jira/browse/HDFS-6929    Author: Arpit Agarwal, 2014-08-27, 23:59
[HDFS-6924] Add new RAM_DISK storage type - HDFS - [issue]
...Add a new RAM_DISK storage type which could be backed by tmpfs/ramfs on Linux or alternative RAM disk on other platforms....
http://issues.apache.org/jira/browse/HDFS-6924    Author: Arpit Agarwal, 2014-08-27, 23:53
[HDFS-6925] DataNode should attempt to place replicas on transient storage first if lazyPersist flag is received - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-6925    Author: Arpit Agarwal, 2014-08-27, 23:52
[HDFS-6926] DN support for saving replicas to persistent storage and evicting in-memory replicas - HDFS - [issue]
...Add the following: A lazy writer on the DN to move replicas from RAM disk to persistent storage. 'Evict' persisted replicas from RAM disk to make space for new blocks....
http://issues.apache.org/jira/browse/HDFS-6926    Author: Arpit Agarwal, 2014-08-27, 23:52
[HDFS-6927] Add unit tests - HDFS - [issue]
...Add a bunch of unit tests to cover flag persistence, propagation to DN, ability to write replicas to RAM disk, lazy writes to disk and eviction from RAM disk....
http://issues.apache.org/jira/browse/HDFS-6927    Author: Arpit Agarwal, 2014-08-27, 23:52
[HDFS-6923] Propagate LazyPersist flag to DNs via DataTransferProtocol - HDFS - [issue]
...If the LazyPersist flag is set in the file properties, the DFSClient will propagate it to the DataNode via DataTransferProtocol....
http://issues.apache.org/jira/browse/HDFS-6923    Author: Arpit Agarwal, 2014-08-27, 23:34
[HDFS-6922] Add LazyPersist flag to INodeFile, save it in FsImage and edit logs - HDFS - [issue]
...Support for saving the LazyPersist flag in the FsImage and edit logs....
http://issues.apache.org/jira/browse/HDFS-6922    Author: Arpit Agarwal, 2014-08-27, 23:33
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