Github user viirya commented on the issue:
https://github.com/apache/spark/pull/16677
@waterman But we need to know the number of output in each partition.
`resultSize` is actually updated at driver with the size of data transmitted
back to the driver.
It is doable if we use a collection accumulator for collecting number of
output. However, as we submit map stage with `submitMapStage`, it is more
natural to get the `MapOutputStatistics` back from the future object returned.
For the API change, as they are private, I think it should not a big issue.
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