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[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-6763] Initialize file system-wide quota once on transitioning to active - HDFS - [issue]
...FSImage#loadEdits calls updateCountForQuota to recalculate & verify quotas for the entire namespace.  A standby NN using shared edits calls this method every minute.  The stand...
http://issues.apache.org/jira/browse/HDFS-6763    Author: Daryn Sharp, 2015-04-24, 21:00
[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-7964] Add support for async edit logging - HDFS - [issue]
...Edit logging is a major source of contention within the NN.  LogEdit is called within the namespace write log, while logSync is called outside of the lock to allow greater concurrency. ...
http://issues.apache.org/jira/browse/HDFS-7964    Author: Daryn Sharp, 2015-03-30, 13:39
[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
[HDFS-7967] Reduce the performance impact of the balancer - HDFS - [issue]
...The balancer needs to query for blocks to move from overly full DNs.  The block lookup is extremely inefficient.  An iterator of the node's blocks is created from the iterators of ...
http://issues.apache.org/jira/browse/HDFS-7967    Author: Daryn Sharp, 2015-03-25, 22:19
[HDFS-7435] PB encoding of block reports is very inefficient - HDFS - [issue]
...Block reports are encoded as a PB repeating long.  Repeating fields use an ArrayList with default capacity of 10.  A block report containing tens or hundreds of thousand of longs (...
http://issues.apache.org/jira/browse/HDFS-7435    Author: Daryn Sharp, 2015-03-20, 16:58
[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, 2015-03-20, 13:42
[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, 2015-03-18, 18:07
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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