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Posted to notifications@accumulo.apache.org by "Eric Newton (JIRA)" <ji...@apache.org> on 2015/12/22 17:21:46 UTC

[jira] [Created] (ACCUMULO-4088) hundreds of Timer threads

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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