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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