Github user mridulm commented on the pull request: https://github.com/apache/spark/pull/4818#issuecomment-76520133 AFAIK this is not documented or part of the YARN interfaces/public contract : I would prefer that spark depended on defined interfaces which are reasonably stable. As and when YARN stabilizes and documents their interfaces; we can modify our codebase if need be - but until then let us defensive about using implementation details.
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