Github user kanzhang commented on the pull request:
https://github.com/apache/spark/pull/6676#issuecomment-110544598
> Ignoring that if you really want you can find the secret by looking at
the memory of another process, all that the secret prevents is someone
connecting back to the driver and pretending to be an executor. Given all of
the above, is that really giving any extra security to the app?
Oh, I missed your point in my last reply. Yes, I do think there is some
extra security to be gained by having a per-app secret key for securing per-app
communications, assuming there is not a trivial way to compromise the per-app
key.
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