Github user mridulm commented on the pull request:
https://github.com/apache/spark/pull/214#issuecomment-38612685
@kayousterhout the backend assumes that there is only a single thread which
is executing inside the actor at a given point of time. We will be changing
this assumption.
For example, updating freeCores (and other manipulations of freeCores/etc
when responses come into the actor).
This change will mean we will need to break that implicit assumption.
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