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[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-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
[HDFS-3312] Hftp selects wrong token service - HDFS - [issue]
...Hftp tries to select a token based on the non-secure port in the uri, instead of the secure-port.  This breaks hftp on a secure cluster and there is no workaround....
http://issues.apache.org/jira/browse/HDFS-3312    Author: Daryn Sharp, 2015-03-10, 04:36
[HDFS-2336] hftp only supports remote hdfs servers - HDFS - [issue]
...The new token renewal implementation appears to introduce invalid assumptions regarding token kinds.Any token acquired over http is assumed to be hftp, so the kind is unconditionally changed...
http://issues.apache.org/jira/browse/HDFS-2336    Author: Daryn Sharp, 2015-03-10, 01:43
[HDFS-7434] DatanodeID hashCode should not be mutable - HDFS - [issue]
...Mutable hash codes may lead to orphaned instances in a collection.  Instances must always be removed prior to modification of hash code values, and re-inserted.  Although current c...
http://issues.apache.org/jira/browse/HDFS-7434    Author: Daryn Sharp, 2015-03-05, 15:50
[HDFS-6967] DNs may OOM under high webhdfs load - HDFS - [issue]
...Webhdfs uses jetty.  The size of the request thread pool is limited, but jetty will accept and queue infinite connections.  Every queued connection is "heavy" with buffers, etc. &n...
http://issues.apache.org/jira/browse/HDFS-6967    Author: Daryn Sharp, 2015-02-23, 16:36
[HDFS-2473] Fetching tokens from insecure cluster throws NPEs - HDFS - [issue]
...Retrieving tokens from an insecure cluster throws an NPE.  This prevents copies from insecure to secure clusters.  The problem is in DFSClient.getDelegationToken().  It attemp...
http://issues.apache.org/jira/browse/HDFS-2473    Author: Daryn Sharp, 2015-02-05, 17:18
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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