Github user sryza commented on the pull request: https://github.com/apache/spark/pull/5233#issuecomment-87165635 Thanks for the explanation @mindprince. That makes sense. This really seems like a bug on the YARN side though - we're counting containers as AMs that are not AMs. A fix on the Spark side would be incomplete, because a Spark AM process could die without having a chance to cancel its pending requests. Is there an associated YARN JIRA for this?
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