Github user CodingCat commented on the pull request:
https://github.com/apache/spark/pull/731#issuecomment-91956998
after rethinking about this patch, I think it seems to be fine to allocate
zero cores in the case I mentioned above, and we just need to filter out those
workers if the freeCore in the worker is less than the spark.executor.cores (if
it is defined)
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