Github user a1k0n commented on the pull request:
https://github.com/apache/spark/pull/11505#issuecomment-192044829
I have to admit I don't completely understand the design, and that this
might just be treating a symptom of something else -- when
`getPreferredLocations` is walking the dependency graph, should those map
output statuses really be null entries? Can they be populated sooner? How does
this thing work?
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