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[HDFS-7597] DNs should not open new NN connections when webhdfs clients seek - HDFS - [issue]
...Webhdfs seeks involve closing the current connection, and reissuing a new open request with the new offset.  The RPC layer caches connections so the DN keeps a lingering connection open...
http://issues.apache.org/jira/browse/HDFS-7597    Author: Daryn Sharp, 2015-08-05, 22:20
[HDFS-8616] Cherry pick HDFS-6945 for excess block leak - HDFS - [issue]
...Busy clusters quickly leak tens or hundreds of thousands of excess blocks which slow BR processing.  HDFS-6495 should be cherry picked into 2.7.x....
http://issues.apache.org/jira/browse/HDFS-8616    Author: Daryn Sharp, 2015-07-21, 04:18
[HDFS-4564] Webhdfs returns incorrect http response codes for denied operations - HDFS - [issue]
...Webhdfs is returning 401 (Unauthorized) instead of 403 (Forbidden) when it's denying operations.  Examples including rejecting invalid proxy user attempts and renew/cancel with an inval...
http://issues.apache.org/jira/browse/HDFS-4564    Author: Daryn Sharp, 2015-06-02, 01:54
[HDFS-8491] DN shutdown race conditions with open xceivers - HDFS - [issue]
...DN shutdowns at least for restarts have many race conditions.  Shutdown is very noisy with exceptions.  The DN notifies writers of the restart, waits 1s and then interrupts the xce...
http://issues.apache.org/jira/browse/HDFS-8491    Author: Daryn Sharp, 2015-05-28, 17:17
[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, 2015-05-18, 20:50
[HDFS-7433] Optimize performance of DatanodeManager's node map - HDFS - [issue]
...The datanode map is currently a TreeMap.  For many thousands of datanodes, tree lookups are ~10X more expensive than a HashMap.  Insertions and removals are up to 100X more expensi...
http://issues.apache.org/jira/browse/HDFS-7433    Author: Daryn Sharp, 2015-05-09, 16:30
[HDFS-7005] DFS input streams do not timeout - HDFS - [issue]
...Input streams lost their timeout.  The problem appears to be DFSClient#newConnectedPeer does not set the read timeout.  During a temporary network interruption the server will clos...
http://issues.apache.org/jira/browse/HDFS-7005    Author: Daryn Sharp, 2015-04-25, 01:10
[HDFS-8133] Improve readability of deleted block check - HDFS - [issue]
...The current means of checking if a block is deleted is checking if its block collection is null.  A more readable approach is an isDeleted method....
http://issues.apache.org/jira/browse/HDFS-8133    Author: Daryn Sharp, 2015-04-22, 14:41
[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, 2015-04-06, 18:15
[HDFS-7990] IBR delete ack should not be delayed - HDFS - [issue]
...HDFS-395 added the incremental BR feature.  A concern was avoiding a race condition with ack-ing block invalidates followed by the directory scanner re-adding the block before the async...
http://issues.apache.org/jira/browse/HDFS-7990    Author: Daryn Sharp, 2015-03-28, 14:42
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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