Github user vanzin commented on a diff in the pull request:
    --- Diff: 
    @@ -506,6 +506,10 @@ private[spark] class MesosClusterScheduler(
           options ++= Seq("--class", desc.command.mainClass)
    +    desc.conf.getOption("spark.mesos.proxyUser").foreach { v =>
    +      options ++= Seq("--proxy-user", v)
    --- End diff --
    > What are legitimate uses if it is not safe? Like knowing what your code 
does so its ok
    Yes. For example you can run some trusted code as a less-privileged user, 
so that you don't accidentally do something stupid as a super user.
    > (Mechanism level: Failed to find any Kerberos tgt)
    That means you don't have any credentials (neither a tgt nor a dt). I don't 
know EMR so I don't know how to use it (with or without kerberos).


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