Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/1002#issuecomment-45810108
BTW, just ran into this in SecurityManager.scala:
private val defaultAclUsers =
Seq[String](System.getProperty("user.name", ""),
Option(System.getenv("SPARK_USER")).getOrElse(""))
So that probably needs the same treatment.
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