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https://issues.apache.org/jira/browse/HBASE-5641?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13239652#comment-13239652
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Lars Hofhansl commented on HBASE-5641:
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@Andrew: In this case this is a constantly running background thread that keeps
statistics around for as long as the server is up. So in this case these must
be daemon threads (only one in this case, though) or the executor must be
shutdown on server shutdown.
Not sure I understand your question. I suppose there are cases where we want to
create non-daemon threads, but typically not in our servers.
> decayingSampleTick1 prevents HBase from shutting down.
> ------------------------------------------------------
>
> Key: HBASE-5641
> URL: https://issues.apache.org/jira/browse/HBASE-5641
> Project: HBase
> Issue Type: Sub-task
> Reporter: Lars Hofhansl
> Assignee: Lars Hofhansl
> Priority: Blocker
> Fix For: 0.94.0, 0.96.0
>
> Attachments: 5641.txt
>
>
> I think this is the problem. It creates a non-daemon thread.
> {code}
> private static final ScheduledExecutorService TICK_SERVICE =
> Executors.newScheduledThreadPool(1,
> Threads.getNamedThreadFactory("decayingSampleTick"));
> {code}
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