Rohith Sharma K S updated YARN-4164:
    Attachment: 0003-YARN-4164.patch

Updated the patch fixing review comment that null will not be returned instead 
priority of an application will be returned.

> Retrospect update ApplicationPriority API return type
> -----------------------------------------------------
>                 Key: YARN-4164
>                 URL: https://issues.apache.org/jira/browse/YARN-4164
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Rohith Sharma K S
>            Assignee: Rohith Sharma K S
>         Attachments: 0001-YARN-4164.patch, 0002-YARN-4164.patch, 
> 0003-YARN-4164.patch
> 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 
> when 
> explicitly invoke via ApplicationClientProtocol#updateApplicationPriority(), 
> response should have updated priority in response. 

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