Github user vanzin commented on the pull request:

    https://github.com/apache/spark/pull/6676#issuecomment-110512604
  
    > Using env variable wouldn't suffice, as we've discussed.
    
    I don't see where you explained that at all. The same code that can write 
the secret to the child process's stdin (in you patch) can set an env variable 
when launching that process.



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