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[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
[HDFS-7457] DatanodeID generates excessive garbage - HDFS - [issue]
...DatanodeID#getXferAddr is a dynamically generated string.  This string is repeatedly generated for the hash code, equality, comparisons, and stringification.  Every DN->NN RPC m...
http://issues.apache.org/jira/browse/HDFS-7457    Author: Daryn Sharp, 2015-01-16, 15:41
[HDFS-7607] Use random rack-local node for webhdfs opens to avoid OOM on DNs - HDFS - [issue]
...Webhdfs currently redirects a client to the DN that physically has one of thereplicas.  Unlike the hdfs data streamer protocol which can easily handle hundreds or thousands of connectio...
http://issues.apache.org/jira/browse/HDFS-7607    Author: Daryn Sharp, 2015-01-14, 15:58
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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