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[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, 2015-03-27, 14:13
[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-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, 2015-03-20, 23:46
[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-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, 2015-03-20, 13:56
[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
[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, 2015-03-14, 01:06
[HDFS-6964] NN fails to fix under replication leading to data loss - HDFS - [issue]
...We've encountered lost blocks due to node failure even when there is ample time to fix the under-replication.2 nodes were lost.  The 3rd node with the last remaining replicas averaged 1...
http://issues.apache.org/jira/browse/HDFS-6964    Author: Daryn Sharp, 2015-03-11, 20:09
[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, 2015-03-11, 18:23
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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