Ufuk Celebi commented on FLINK-7409:

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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