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[HDFS-5453] Support fine grain locking in FSNamesystem - HDFS - [issue]
...The namesystem currently uses a course grain lock to control access.  This prevents concurrent writers in different branches of the tree, and prevents readers from accessing branches th...
http://issues.apache.org/jira/browse/HDFS-5453    Author: Daryn Sharp, 2014-01-21, 14:59
[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-5773] NN may reject formerly dead DNs - HDFS - [issue]
...If the heartbeat monitor declares a node dead, it may never allow a DN to rejoin.  The NN will generate messages like "Got blockReceivedDeleted message from unregistered or dead node".T...
http://issues.apache.org/jira/browse/HDFS-5773    Author: Daryn Sharp, 2014-01-14, 23:45
[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
[HDFS-4437] Clients should not retain leases on moved files - HDFS - [issue]
...Moving open files and/or parent directories of open files will rewrite the leases to the new path.  The client is not notified so future stream operations will fail.  However, as l...
http://issues.apache.org/jira/browse/HDFS-4437    Author: Daryn Sharp, 2013-10-03, 01:00
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