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https://issues.apache.org/jira/browse/FLINK-7409?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123101#comment-16123101
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Ufuk Celebi commented on FLINK-7409:
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Thanks! I think it's really nice that you fixed this in your PR :-)

> 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
>            Priority: Minor
>
> 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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