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https://issues.apache.org/jira/browse/FLINK-7409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123037#comment-16123037
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Ufuk Celebi commented on FLINK-7409:
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I brought this issue up a while back too (in FLINK-3182). If we decide to fix
this now, I would close/link that issue here.
> WebRuntimeMonitor blocks serving threads
> ----------------------------------------
>
> Key: FLINK-7409
> URL: https://issues.apache.org/jira/browse/FLINK-7409
> Project: Flink
> Issue Type: Improvement
> Components: Webfrontend
> Affects Versions: 1.4.0
> Reporter: Till Rohrmann
> Assignee: Till Rohrmann
>
> The {{WebRuntimeMonitor}} contains a lot of blocking operations where it
> retrieves a result from the {{JobManager}} and then waits on the future to
> obtain the result. This is not a good design since we are blocking server
> threads with that. Instead I propose to follow a more reactive approach where
> the {{RequestHandler}} returns a {{CompletableFuture}} of {{FullHttpResonse}}
> which is in the completion handler written out to the channel.
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