Till Rohrmann created FLINK-4853:

             Summary: Clean up JobManager registration at the ResourceManager
                 Key: FLINK-4853
                 URL: https://issues.apache.org/jira/browse/FLINK-4853
             Project: Flink
          Issue Type: Sub-task
          Components: ResourceManager
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann

The current {{JobManager}} registration at the {{ResourceManager}} blocks 
threads in the {{RpcService.execute}} pool. This is not ideal and can be 
avoided by not waiting on a {{Future}} in this call.

I propose to encapsulate the leader id retrieval operation in a distinct 
service so that it can be separated from the {{ResourceManager}}. This will 
reduce the complexity of the {{ResourceManager}} and make the individual 
components easier to test.

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