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https://issues.apache.org/jira/browse/HBASE-25279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264539#comment-17264539
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Andrew Kyle Purtell commented on HBASE-25279:
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[~zhangduo]
bq. I think this is a bug fix, without the patch it is impossible to do a clean
shutdown.
That's not true. The watchers should be closed. The threads will be terminated
then. Leaving a ZK watcher unclosed is a leak. That's the real bug. Right?
> Non-daemon thread in ZKWatcher
> ------------------------------
>
> Key: HBASE-25279
> URL: https://issues.apache.org/jira/browse/HBASE-25279
> Project: HBase
> Issue Type: Bug
> Components: Zookeeper
> Reporter: Josh Elser
> Assignee: Josh Elser
> Priority: Critical
> Fix For: 3.0.0-alpha-1, 2.5.0
>
>
> ZKWatcher spawns an ExecutorService which doesn't mark its threads as daemons
> which will prevent clean shut downs.
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