Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/3509#issuecomment-64908608
Do you still see the issue after this patch?
https://github.com/apache/spark/commit/83b7a1c6503adce1826fc537b4db47e534da5cae
I believe that if there are no outputs for a map, the reduce side should
never try to fetch the outputs in the first place.
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