Github user tnachen commented on the pull request:
https://github.com/apache/spark/pull/4170#issuecomment-71773647
If you read the fine-grained mode source code, you'll notice that Spark is
using the slave id as the executor id, which is what we discussed on the mesos
mailing list, that the executor will be re-used if all tasks reuse the same
executor id.
Therefore, it's only launching one executor per slave, and if the executor
dies Mesos will relaunch it when the task asks for it again.
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