Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/7461#issuecomment-131894237
Hmm I see - We'll need to instrument the DAGScheduler to see what is going
on here -- for example printing the location preferences set for the reduce
task might be helpful here (we can do that with say logDebug ?) [1]
cc @mateiz who is looking at related issues
[1]
https://github.com/apache/spark/blob/76c155dd4483d58499e5cb66e5e9373bb771dbeb/core/src/main/scala/org/apache/spark/scheduler/DAGScheduler.scala#L1407
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