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From "Eric Newton (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ACCUMULO-4088) hundreds of Timer threads
Date Tue, 22 Dec 2015 16:21:46 GMT
Eric Newton created ACCUMULO-4088:
-------------------------------------

             Summary: hundreds of Timer threads
                 Key: ACCUMULO-4088
                 URL: https://issues.apache.org/jira/browse/ACCUMULO-4088
             Project: Accumulo
          Issue Type: Bug
          Components: client
    Affects Versions: 1.7.0
         Environment: Small test cluster (~20 nodes)
            Reporter: Eric Newton


I was looking at a client that was ingesting slowly with [~dlmarion].  We jstacked the client
to determine what was going on.  We found 700+ BatchWriterLatencyTimer threads.  This client
only has one BatchWriter.

The same client was known to have zookeeper disconnects, and servers reported that sessionIDs
could not be found.  Suspect that the client was running out of memory, having GC pauses,
which caused zookeeper disconnects and session timeouts.

The same client was running well under 1.6, and began having issues under 1.7.



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