Github user markhamstra commented on the pull request:
https://github.com/apache/spark/pull/3705#issuecomment-67912545
@vanzin You need to read some more about Akka actors.
The fundamental abstraction is that an actor has a message queue, the only
way to communicate with the actor is via messages, those messages end up in the
queue, and they are handled one at a time in the `receive` method. That the
actor could be receiving messages from more than one sender does not in any way
imply that messages will be processed concurrently.
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