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https://issues.apache.org/jira/browse/HBASE-25279?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264543#comment-17264543
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Andrew Kyle Purtell commented on HBASE-25279:
---------------------------------------------

I was going to wait until we have a proper fix in place before moving forward 
with a release from branch-2.4. 

[~zhangduo] argues this restores old behavior. I would buy that argument but 
don't want this issue to get lost. 

What should we do here?

> 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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