Github user li-zhihui commented on the pull request: https://github.com/apache/spark/pull/1684#issuecomment-51282316 @tgravescs got it. But, <code>YarnClusterSchedulerBackend</code> use the same strategy (code and comment). https://github.com/apache/spark/blob/master/yarn/common/src/main/scala/org/apache/spark/scheduler/cluster/YarnClusterSchedulerBackend.scala#L41 I think we should fix it to env variable overriding config too.
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