Github user sryza commented on the pull request:
https://github.com/apache/spark/pull/5063#issuecomment-84055432
I'd like to better understand the reason this is needed in Mesos
fine-grained mode. We've talked about eventually adding a fine-grained mode
for YARN as well. So if we think this configuration property might apply there
as well, it'd be nice to make it generic. Otherwise, putting Mesos in the name
seems fine.
Why do we set aside a core for the framework? Is this just a quirk of
Mesos or is the idea that the executor process actually needs a full core for
its non-task work?
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