Github user tejasapatil commented on the pull request: https://github.com/apache/spark/pull/11723#issuecomment-200704530 @rxin : Yes !! At Facebook we are using an internal scheduler to run Spark executors. Maintaining an internal patch to have that "glue" and merging it against every Spark release can be avoided by this PR. Ideally we want to get to a place where there are no patches to maintain and everything is just pluggable. If we get there, testing RCs would be easier and we can help flagging issues early on (especially ones related to scalability).
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