Github user felixcheung commented on the pull request:

    https://github.com/apache/spark/pull/10652#issuecomment-173026763
  
    Driver could also be running in YARN cluster mode in which a clean state 
might make sense?
    To me this is just to reduce the level of variability. And this was brought 
up in PR #10171
    I could also change this to only for driver in cluster mode but not from 
`sparkR` shell.


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