Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/4405#issuecomment-73143745
  
    Some description of the testing I did:
    
    - normal submission without kerberos
    - impersonated submition without kerberos (got expected "unauthorized" 
error from Yarn since I did not have impersonation configured)
    - normal submission as system user ("oozie" - id = 480) with kerberos 
(denied by Yarn since id < 1000)
    - impersonated submission as same system user with kerberos, app runs as 
proxy user (and proxy user shows up in history as owner of the app).


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