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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-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-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-5240] Separate formatting from logging in the audit logger API - HDFS - [issue]
...The audit logger API should be extended (in a compatible manner) to separate the formatting of the log message from the actual logging of the message....
http://issues.apache.org/jira/browse/HDFS-5240    Author: Daryn Sharp, 2013-09-24, 14:29
[HDFS-5238] Improve NN operation throughput - HDFS - [issue]
...Umbrella jira to track improvements from profiling the NN....
http://issues.apache.org/jira/browse/HDFS-5238    Author: Daryn Sharp, 2013-09-20, 16:19
[HDFS-5243] Remove contention during block token creation - HDFS - [issue]
...Creating a block token is unnecessarily synchronized....
http://issues.apache.org/jira/browse/HDFS-5243    Author: Daryn Sharp, 2013-09-20, 15:51
[HDFS-5029] Token operations should not block read operations - HDFS - [issue]
...Token operations unnecessarily obtain the write lock on the namespace.  Edits for token operations are independent of edits for other namespace write operations, and the edits have no o...
http://issues.apache.org/jira/browse/HDFS-5029    Author: Daryn Sharp, 2013-09-06, 19:30
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB