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From "Eric Newton (JIRA)" <>
Subject [jira] [Resolved] (ACCUMULO-4088) hundreds of Timer threads
Date Tue, 22 Dec 2015 16:35:46 GMT


Eric Newton resolved ACCUMULO-4088.
    Resolution: Not A Problem

Probably an user error: wasn't closing batchwriters on errors.

> hundreds of Timer threads
> -------------------------
>                 Key: ACCUMULO-4088
>                 URL:
>             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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