Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/8280#issuecomment-132331662
So my hypothesis right now is that the RDD in the reduce stage has two
Shuffle dependencies and the first shuffle dependency happens to be the single
map task stage -- so the locality preference ends up giving all the tasks to
the single host.
Hmm so my guess is that we need to be able to differentiate among different
shuffle dependencies ideally. Here is another suggestion: Can we turn this off
if we have more than one shuffle dependency ? it should be pretty cheap to
count that
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