Till Rohrmann created FLINK-7409:

             Summary: 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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