Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/1131#issuecomment-46537074
A preferred task for one worker might be picked up by another worker on
process/node/rack only if they are at the same locality level : in which case,
it is irrelevant which worker picks it up since both are at same locality
level. I am probably missing why this is required ?
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