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https://issues.apache.org/jira/browse/HBASE-28563?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17843627#comment-17843627
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Istvan Toth commented on HBASE-28563:
-------------------------------------
Background:
The daemon bug is fixed in ZK 3.9+, but ZK has decided not to fix it in 3.8.
> Closing ZooKeeper in ZKMainServer
> ---------------------------------
>
> Key: HBASE-28563
> URL: https://issues.apache.org/jira/browse/HBASE-28563
> Project: HBase
> Issue Type: Improvement
> Reporter: Minwoo Kang
> Priority: Minor
> Labels: pull-request-available
>
> Users can switch the Zookeeper client/server communication framework to Netty.
> ZKMainServer process fails to terminate due to when users utilize Netty for
> ZooKeeper connections.
> Netty threads identified as non-Daemon threads.
> Enforce the calling of close() on ZooKeeper before ZKMainServer termination.
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