Github user jerryshao commented on the issue:

    https://github.com/apache/spark/pull/19227
  
    Hi @vanzin thanks a lot for your comments. Would you please elaborate more? 
I'm not sure if I really understand your comment. According to this PR I don't 
think I ship the keytab around in standalone mode, even keytab is not strictly 
required, a tgt existed in driver's environment is enough.


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