Github user rxin commented on the pull request: https://github.com/apache/spark/pull/11105#issuecomment-197571739 BTW the other thing I really don't like is the current accumulator user facing API. It is way too complicated with implicit parameters etc, making it unusable in Java and impossible to build a single unified API. We probably should fix that. That said, it'd be better for somebody who knows the engine really well and at the same time very detailed oriented to come up with a design.
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