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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
[YARN-2964] RM prematurely cancels tokens for jobs that submit jobs (oozie) - YARN - [issue]
...The RM used to globally track the unique set of tokens for all apps.  It remembered the first job that was submitted with the token.  The first job controlled the cancellation of t...
http://issues.apache.org/jira/browse/YARN-2964    Author: Daryn Sharp, 2015-04-23, 17:59
[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
[HADOOP-10013] FileSystem checkPath accepts invalid paths with an authority but no scheme - Hadoop - [issue]
...FileSystem#checkPath will consider paths of the form //junk/path as being valid for the given fs.  The problem is checkPath shorts out if the path contains no scheme - assuming it must ...
http://issues.apache.org/jira/browse/HADOOP-10013    Author: Daryn Sharp, 2015-04-15, 18:03
[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
[HADOOP-11780] Prevent IPC reader thread death - Hadoop - [issue]
...Reader threads can die to a race condition with the responder thread.  If the server's ipc handler cannot send a response in one write, it delegates sending the rest of the response to ...
http://issues.apache.org/jira/browse/HADOOP-11780    Author: Daryn Sharp, 2015-03-31, 20:33
[HADOOP-10300] Allowed deferred sending of call responses - Hadoop - [issue]
...RPC handlers currently do not return until the RPC call completes and response is sent, or a partially sent response has been queued for the responder.  It would be useful for a proxy m...
http://issues.apache.org/jira/browse/HADOOP-10300    Author: Daryn Sharp, 2015-03-30, 14:41
[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
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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