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https://issues.apache.org/jira/browse/ZOOKEEPER-4804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17829215#comment-17829215
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Istvan Toth commented on ZOOKEEPER-4804:
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I think this is important enopugh to be backported to all active branches.
FYI [~andor]
> Use daemon threads for Netty client
> -----------------------------------
>
> Key: ZOOKEEPER-4804
> URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4804
> Project: ZooKeeper
> Issue Type: Bug
> Affects Versions: 3.8.3
> Reporter: Istvan Toth
> Assignee: Istvan Toth
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.10.0
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> When the Netty client is used, the Java process hangs on System.exit if there
> is an open Zookeeper connection.
> This is caused by the non-daemon threads created by Netty.
> Exiting without closing the connection is not a good practice, but this hang
> does not happen with the NIO client, and I think ZK should behave the same
> regardless of the client implementation used.
> The Netty ThreadFactory implementation is configurable, it shouldn't be too
> hard make sure that daemon threads are created.
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