Github user mateiz commented on the pull request:
https://github.com/apache/spark/pull/3994#issuecomment-70352140
This looks like it's going to create a separate executor for each task,
which is the opposite of what we want for fine-grained mode. The goal of
fine-grained mode is to share each executor between multiple tasks.
What was the problem here? Do you have two Mesos slaves on the same machine
and they clash?
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