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Merge pull request alteryx#23 from jerryshao/multi-user
Add Spark multi-user support for standalone mode and Mesos This PR add multi-user support for Spark both standalone mode and Mesos (coarse and fine grained ) mode, user can specify the user name who submit app through environment variable `SPARK_USER` or use default one. Executor will communicate with Hadoop using specified user name. Also I fixed one bug in JobLogger when different user wrote job log to specified folder which has no right file permission. I separate previous [PR750](mesos/spark#750) into two PRs, in this PR I only solve multi-user support problem. I will try to solve security auth problem in subsequent PR because security auth is a complicated problem especially for Shark Server like long-run app (both Kerberos TGT and HDFS delegation token should be renewed or re-created through app's run time). (cherry picked from commit be7e8da) Signed-off-by: Reynold Xin <rxin@apache.org>
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