Github user JoshRosen commented on the pull request:
https://github.com/apache/spark/pull/3705#issuecomment-67907292
> 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. :-)
Yeah, this is kind of hard to find, but it's described in the [Actors and
the Java Memory
Model](http://doc.akka.io/docs/akka/2.0.2/general/jmm.html#Actors_and_the_Java_Memory_Model)
section:
> **The actor subsequent processing rule**: processing of one message
happens before processing of the next message by the same actor.
To get parallelism, the Akka solution is to use multiple actors. That
said, people do [mix the actor model with other concurrency
models](http://osl.cs.illinois.edu/publications/conf/ecoop/TasharofiDJ13.html),
so it pays to be careful here.
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