Github user winningsix commented on the pull request:
https://github.com/apache/spark/pull/8880#issuecomment-164317758
>>we have to do it in the level of Yarn module since we need to obtain the
security key from the credentials stored in user group information
>Yeah, I see... I was going to suggest moving the implementation of
YarnSparkHadoopUtil.getCurrentUserCredentials to core, but hadoop 1 doesn't
have the needed API. So we have to wait for SPARK-11807 to do that. Let's leave
the test in the yarn module in the meantime and file a bug (blocked by
SPARK-11807) to move it to the right place later. Can you do that?
Ticket is filed in https://issues.apache.org/jira/browse/SPARK-12278
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