Github user cloud-fan commented on the pull request:
https://github.com/apache/spark/pull/12858#issuecomment-220208358
Conceptually long accumulator is enough for integral accumulation, that's
why we don't implement `IntAccumulator`. However, `LongAccumulator` can't be
used as `Accumulator[Int]`, the type system doesn't allow it.
Some tests in `AccumulatorV2Suite` uses int (eg. 0 not 0L) because compiler
can cast it to long for us. (that why we think int accumulator is not that
useful, as int can always be casted to long)
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