Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/2126#issuecomment-53611043
Right so as it says "including any doAs in the current stack", so the
DFSClient is using the user set via the doAs. The user set from Sparks
runAsUser -> doAs is what you specified as SPARK_USER. so it should be picking
it up.
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