Github user jiangxb1987 commented on the issue:
https://github.com/apache/spark/pull/19951
It's not possible to differentiate the two race conditions @vanzin
described in this code path without adding extra communication loads, since
this should be a minor issue and there is no simple fix for it, I'd suggest we
close this PR for now and revisit when someone come off a better solution, WDYT
@vanzin @tgravescs @rezasafi @srowen @KaiXinXiaoLei ?
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