Github user srowen commented on the pull request:
https://github.com/apache/spark/pull/13187#issuecomment-220489424
I think he was saying that you using `LongAccumulator` for
`Accumulator[Int]`. I don't see anything that suggests this isn't the
replacement. It could have been done here but can be done elsewhere.. I will
want to put in at least one more warnings cleanup change before 2.0
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