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[HDFS-6955] DN should reserve disk space for a full block when creating tmp files - HDFS - [issue]
...HDFS-6898 is introducing disk space reservation for RBW files to avoid running out of disk space midway through block creation.This Jira is to introduce similar reservation for tmp files....
http://issues.apache.org/jira/browse/HDFS-6955    Author: Arpit Agarwal, 2014-08-27, 21:08
[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, 2014-08-27, 16:55
[HDFS-6936] The HttpFSFileSystem should also return the isLazyPersist flag in the FileStatus - HDFS - [issue]
...Per code review from Jitendra Nath Pandey on HDFS-6921, the HttpFSFileSystem should also return the isLazyPersist flag in the FileStatus....
http://issues.apache.org/jira/browse/HDFS-6936    Author: Arpit Agarwal, 2014-08-27, 16:55
Re: Updates on migration to git - HDFS - [mail # dev]
...I cloned the new repo, built trunk and branch-2, verified all the branchesare present. Also checked a few branches and the recent commit historymatches our existing repo. Everything looks go...
   Author: Arpit Agarwal, 2014-08-26, 22:29
[HDFS-6900] Eliminate DU thread per block pool slice - HDFS - [issue]
...We use one DU thread per block pool slice to compute disk usage information. In addition to the thread overhead this results in the disk usage information being out of date for up to 10 minu...
http://issues.apache.org/jira/browse/HDFS-6900    Author: Arpit Agarwal, 2014-08-26, 00:16
[HDFS-6581] Write to single replica in memory - HDFS - [issue]
...Per discussion with the community on HDFS-5851, we will implement writing to a single replica in DN memory via DataTransferProtocol.This avoids some of the issues with short-circuit writes, ...
http://issues.apache.org/jira/browse/HDFS-6581    Author: Arpit Agarwal, 2014-08-26, 00:01
[HDFS-6933] Skip checksum verification when reading from memory - HDFS - [issue]
...Checksum verification can be skipped when reading from replicas on local RAM disk....
http://issues.apache.org/jira/browse/HDFS-6933    Author: Arpit Agarwal, 2014-08-25, 11:49
[HDFS-6934] Move checksum computation off the hot path when writing to RAM disk - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-6934    Author: Arpit Agarwal, 2014-08-23, 22:35
[HDFS-6932] Balancer and Mover tools should ignore replicas on RAM_DISK - HDFS - [issue]
...Per title, balancer and mover should just ignore replicas on RAM disk instead of attempting to move them to other nodes....
http://issues.apache.org/jira/browse/HDFS-6932    Author: Arpit Agarwal, 2014-08-23, 22:31
[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, 2014-08-23, 22:27
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