Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1196#issuecomment-47292171
Looks ok, aside from the minor semantic issue above. The comment below
scares me a little bit:
If the user is null it is assumed authentication isn't turned on and
all users have access.
But I don't know enough about this code at the moment to be able to see if
that's an actual problem.
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