Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/2320#issuecomment-185458452
Ok, so we seems like we agree on the overall approach. Regarding
SPARK-2541, it used to be that just overriding the `SPARK_USER` env variable
would allow you to "impersonate" anyone. Doesn't that work anymore?
That way, if you set `SPARK_USER` to the name of the principal running the
Spark daemons, things should work without any modifications to the current code.
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