Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/9859#issuecomment-159023025
  
    So, is there any code in any of the other backends to actually use those 
config options?
    
    Looking at the bug, isn't the fix actually achieved by just doing the login 
(`UserGroupInformation.loginUserFromKeytab(args.principal, args.keytab)`)?


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