Github user jongyoul commented on the pull request:
https://github.com/apache/spark/pull/3741#issuecomment-68023902
@JoshRosen I didn't know that exact behaviour of `runAsSparkUser` because I
understood that `runAsSparkUser` influenced all method of instances created in
that block. In case of using JNI, `runAsSparkUser` doesn't conserve any
information.
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