Github user staple commented on the pull request:
https://github.com/apache/spark/pull/1362#issuecomment-49457211
I added some patches to address the above comments and introduce a timed
test.
My test uses an RDD with no preferred locations in the entire dependency
graph. The reason for this is that some RDD types employ mitigations for the
exponential blowup problem by overriding getPreferredLocations to return the
preferred locations of their parents. The easiest way to circumvent these
mitigations and implement a failing test was to create a dependency graph with
no preferred locations.
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