Github user vanzin commented on the pull request: https://github.com/apache/spark/pull/8911#issuecomment-143358255 I did a cursory lookup for where it is set, and I think the places that need to be changed are `SparkContext.stop()` and YARN's `Client.scala`. Doing it in `SparkContext`'s creating is an option, but feels a little weird; in that case I'd rather set it to `1` or `0` (or some other boolean value) to indicate whether it's running in YARN mode, but that would be a much bigger change.
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