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[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-6978] Directory scanner should correctly reconcile blocks on RAM disk - HDFS - [issue]
...It used to be very unlikely that the directory scanner encountered two replicas of the same block on different volumes.With memory storage, it is very likely to hit this with the following s...
http://issues.apache.org/jira/browse/HDFS-6978    Author: Arpit Agarwal, 2014-08-29, 22:44
[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
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