Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/1313#issuecomment-49206975
BTW even in that case we could solve it by having more levels, basically
pass in a different level to request speculative tasks after we requested
non-speculative ones, or pass in a boolean called speculativeAllowed. It seems
the main change really is to treat no-prefs as less local than node- and
process-local, whereas in the past it was treated as equivalent to
process-local.
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