Github user vanzin commented on the pull request:
https://github.com/apache/spark/pull/3705#issuecomment-67905774
> implicit thread-safety due to that actor's message-at-a-time processing.
It wasn't very clear to me in which cases messages could be processed in
parallel using akka from my last read of the documentation, but guess I'm due
for a second reading. :-)
I'll double-check that I'm not breaking that assumption at least.
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