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https://issues.apache.org/jira/browse/HBASE-25505?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17264559#comment-17264559
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Bharath Vissapragada commented on HBASE-25505:
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Agree with the opinion. Marking them as daemon just for convenience masks the
root problem of an orderly shutdown. I'd prefer to fix the root cause instead.
> ZK watcher threads are daemonized; reconsider
> ---------------------------------------------
>
> Key: HBASE-25505
> URL: https://issues.apache.org/jira/browse/HBASE-25505
> Project: HBase
> Issue Type: Brainstorming
> Reporter: Andrew Kyle Purtell
> Priority: Major
>
> On HBASE-25279 there was some discussion and difference of opinion about
> having ZK watcher pool threads be daemonized. This is not necessarily a
> problem but should be reconsidered.
> Daemon threads are subject to abrupt termination during JVM shutdown and
> therefore may be interrupted before state changes are complete or resources
> are released.
> As long as ZK watchers are properly closed by shutdown logic the pool threads
> will be terminated in a controlled manner and the JVM will exit.
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