jinfeng created FLINK-23169:
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             Summary: Support user-level app staging directory when 
yarn.staging-directory is specified
                 Key: FLINK-23169
                 URL: https://issues.apache.org/jira/browse/FLINK-23169
             Project: Flink
          Issue Type: Improvement
          Components: Deployment / YARN
            Reporter: jinfeng


When yarn.staging-directory is specified,  different users will use the same 
directory as the staging directory.   It may not friendly for a job platform to 
submit job for different users.  I propose to use the user-level directory by 
default when yarn.staging-directory is specified.  We only need to make small 
changes  for `getStagingDir` function in 

YarnClusterDescriptor 



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