Github user tgravescs commented on the pull request:
https://github.com/apache/spark/pull/11327#issuecomment-216339359
Ok, I replaced the location iterator and now get all the preferred
locations up front. This made the run time of the this go from around a minute
down to around 6 seconds.
I kept most of the logic the same and just changed how its getting the
locations.
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