Github user ash211 commented on the pull request:
https://github.com/apache/spark/pull/2519#issuecomment-56917577
My recent commits address @pwendell 's comments but I'd like to include an
answer to my first two bullet points from the summary before merging:
- What's the difference between NO_PREF and ANY? I understand the
implications of the ordering but don't know what an example of each would be
- Why is NO_PREF ahead of RACK_LOCAL? I would think it'd be better to
schedule rack-local tasks ahead of no preference if you could only do one or
the other. Is the idea to wait longer and hope for the rack-local tasks to turn
into node-local or better?
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