Github user akopich commented on the issue:
https://github.com/apache/spark/pull/19565
@hhbyyh, in case of "filter before sample" in a local test the overhead is
negligible.
Regarding "sample before filter", you are right. There (strictly speaking)
should be adjustment of `miniBatchFraction`. Which is why I do prefer "filter
before sample".
Also note, version "sample before filter" is logically equivalent to the
current upstream/master.
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