Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/1528#issuecomment-49744970
also, this is preemptive or non-preemptive?
according to my understanding on the code, it's non-preemptive, then a high
priority TaskSet is easily to be delayed when there are a lot of last-long but
low priority TaskSets
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