Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/214#issuecomment-38613780
In coarse grained scheduler, freeCores is updated once the task desc's are
returned - in launchTasks; and expected to be used within the actor thread (so
MT-unsafe).
Also, it is private (and impl detail) of the scheduler backend; task
scheduler should be agnostic to it.
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