Rohith Sharma K S created YARN-4164:

             Summary: Retrospect update ApplicationPriority response API
                 Key: YARN-4164
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: resourcemanager
            Reporter: Rohith Sharma K S

Currently {{ApplicationClientProtocol#updateApplicationPriority()}} API returns 
empty UpdateApplicationPriorityResponse response.
But RM update priority to the cluster.max-priority if the given priority is 
greater than cluster.max-priority. In this scenarios, need to intimate back to 
client that updated  priority rather just keeping quite where client assumes 
that given priority itself is taken.

During application submission also has same scenario can happen, but I feel 
explicitly invoke via ApplicationClientProtocol#updateApplicationPriority(), 
response should have updated priority in response. 

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