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[HDFS-5514] FSNamesystem's fsLock should allow custom implementation - HDFS - [issue]
...Changing fsLock from a ReentrantReadWriteLock to an API compatible class that encapsulates the rwLock will allow for more sophisticated locking implementations such as fine grain locking....
http://issues.apache.org/jira/browse/HDFS-5514    Author: Daryn Sharp, 2014-01-28, 23:36
[HDFS-5241] Provide alternate queuing audit logger to reduce logging contention - HDFS - [issue]
...The default audit logger has extremely poor performance.  The internal synchronization of log4j causes massive contention between the call handlers (100 by default) which drastically li...
http://issues.apache.org/jira/browse/HDFS-5241    Author: Daryn Sharp, 2014-01-25, 13:38
[HDFS-5823] Document async audit logging - HDFS - [issue]
...HDFS-5241 added an option for async log4j audit logging.  The option is considered semi-experimental and should be documented in hdfs-defaults.xml after it's stability under stress is p...
http://issues.apache.org/jira/browse/HDFS-5823    Author: Daryn Sharp, 2014-01-23, 17:07
[HDFS-5242] Reduce contention on DatanodeInfo instances - HDFS - [issue]
...Synchronization in DatanodeInfo instances causes unnecessary contention between call handlers....
http://issues.apache.org/jira/browse/HDFS-5242    Author: Daryn Sharp, 2014-01-15, 22:04
[HDFS-5654] Add lock context support to FSNamesystemLock - HDFS - [issue]
...Supporting new methods of locking the namesystem, ie. coarse or fine-grain, needs an api to manage the locks (or any object conforming to Lock interface) held during access to the namespace....
http://issues.apache.org/jira/browse/HDFS-5654    Author: Daryn Sharp, 2013-12-11, 19:39
[HDFS-5655] Update FSNamesystem path operations to use a lock context - HDFS - [issue]
...Most path based methods should use the FSNamesystem.LockContext introduced by HDFS-5654....
http://issues.apache.org/jira/browse/HDFS-5655    Author: Daryn Sharp, 2013-12-11, 17:09
[HDFS-5239] Allow FSNamesystem lock fairness to be configurable - HDFS - [issue]
...The fairness of the FSNamesystem#fsLock is hardcoded to true.  Using an unfair lock provides a negligible increase to throughput.  However this is due to bottlenecks elsewhere in t...
http://issues.apache.org/jira/browse/HDFS-5239    Author: Daryn Sharp, 2013-10-18, 12:34
[HDFS-3990] NN's health report has severe performance problems - HDFS - [issue]
...The dfshealth page will place a read lock on the namespace while it does a dns lookup for every DN.  On a multi-thousand node cluster, this often results in 10s+ load time for the healt...
http://issues.apache.org/jira/browse/HDFS-3990    Author: Daryn Sharp, 2013-10-10, 02:55
[HDFS-5293] Symlink resolution requires unnecessary RPCs - HDFS - [issue]
...When the NN encounters a symlink, it throws an UnresolvedLinkException.  This exception contains only the path that is a symlink.  The client issues another RPC to obtain the link ...
http://issues.apache.org/jira/browse/HDFS-5293    Author: Daryn Sharp, 2013-10-07, 23:40
[HDFS-5294] DistributedFileSystem#getFileLinkStatus should not fully qualify the link target - HDFS - [issue]
...The NN returns a FileStatus containing the exact link target as specified by the user at creation.  However, DistributedFileSystem#getFileLinkStatus explicit overwrites the target with ...
http://issues.apache.org/jira/browse/HDFS-5294    Author: Daryn Sharp, 2013-10-07, 15:36
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