Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/2126#issuecomment-53609195
@tgravescs
I found DFSClient set it's ugi from UserGroupInformation.getCurrentUser();,
and getCurrentUser's description is "Return the current user, including any
doAs in the current stack.". Thus ugi.doAs is ignored. I think that my patch is
fragile but, for now, that's the only way to change DFSClient from SPARK_USER.
Please tell me if you have better idea or solution.
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