Ji Yan created SPARK-19740:
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             Summary: Spark executor always runs as root when running on mesos
                 Key: SPARK-19740
                 URL: https://issues.apache.org/jira/browse/SPARK-19740
             Project: Spark
          Issue Type: Bug
          Components: Mesos
    Affects Versions: 2.1.0
            Reporter: Ji Yan


When running Spark on Mesos with docker containerizer, the spark executors are 
always launched with 'docker run' command without specifying --user option, 
which always results in spark executors running as root. Mesos has a way to 
support arbitrary parameters. Spark could use that to expose setting user



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