Github user squito commented on the pull request:
https://github.com/apache/spark/pull/7699#issuecomment-134760879
@mateiz I'm a bit confused by:
> (and it's really meant to be fixing a wider class of problems caused by
this)
I'm not sure what the wider class of problem is -- the only thing I know of
is this issue, that the the downstream stage gets executed before the map
outputs are registered for the previous users. If there are other issues,
should we add more tests? I can definitely add more test cases if you can give
me the general idea of what else you think this will fix.
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