Github user shivaram commented on the pull request:
https://github.com/apache/spark/pull/6652#issuecomment-110182980
Thanks @kayousterhout for taking a look and proposing this new design. I
agree that its more cleaner than the top-5 locations and we only get up to 5
locations at the maximum with fraction as 0.2. I've updated the code to reflect
this now.
BTW I also removed caching the preferred locations in the map output
tracker. This made it messy to implement an API which accepted
`fractionThreshold` as an argument and I think the caching only helps in case
of speculative tasks / failures (so it shouldn't hurt us much).
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