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https://issues.apache.org/jira/browse/FLINK-4741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15695718#comment-15695718
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ASF GitHub Bot commented on FLINK-4741:
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Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2862
Looks reasonable, merging it.
> WebRuntimeMonitor does not shut down all of it's threads (EventLoopGroups) on
> exit.
> -----------------------------------------------------------------------------------
>
> Key: FLINK-4741
> URL: https://issues.apache.org/jira/browse/FLINK-4741
> Project: Flink
> Issue Type: Bug
> Components: Webfrontend
> Affects Versions: 1.1.2
> Reporter: Joseph Sims
> Assignee: Roman Maier
> Priority: Minor
>
> WebRuntimeMonitor does not shutdown correctly, causing the overall
> application to hang on shutdown. It shuts down bootstrap.group
> (EventLoopGroup) but not the bootstrap.childGroup (EventLoopGroup).
> If WebRuntimeMonitor is not used (local.start-webserver=false), this problem
> does not occur.
> Class: WebRuntimeMonitor
> method: stop()
> Line: ~387
> Called:
> bootstrap.group().shutdownGracefully()
> Not called:
> bootstrap.childGroup().shutdownGracefully()
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