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[HDFS-5946] Webhdfs DN choosing code is flawed - HDFS - [issue]
...HDFS-5891 improved the performance of redirecting webhdfs clients to a DN.  Instead of attempting a connection with a 1-minute timeout, the NN skips decommissioned nodes.The logic appea...
http://issues.apache.org/jira/browse/HDFS-5946    Author: Daryn Sharp, 2014-02-13, 20:11
[HDFS-5947] Improve dead node detection and handling - HDFS - [issue]
...When HeartbeatManager.heartbeatCheck runs: All DNs are scanned to count dead nodes Processes the first dead node If there was a dead node, loops to re-scan all DNs againProcessing the dead n...
http://issues.apache.org/jira/browse/HDFS-5947    Author: Daryn Sharp, 2014-02-13, 16:12
[HDFS-5875] Add iterator support to INodesInPath - HDFS - [issue]
..."Resolve as you go" inode iteration will help with the implementation of alternative locking schemes.  It will also be the pre-cursor for resolving paths once and only once per operatio...
http://issues.apache.org/jira/browse/HDFS-5875    Author: Daryn Sharp, 2014-02-04, 03:29
[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
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