Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/1907#issuecomment-51970648
I'm not sure what akka.io would bring here. The main benefit seems to be
more native Scala APIs. In this case I am not sure if we care since this is a
low level module. Akka's abstraction is fairly high level, which can make stuff
harder to debug for a low level module.
Netty is presumably more robust (due to the much larger user base). I'm
also not sure whether akka-io supports using transferTo directly under the hood
and managed buffers to reduce GC (my quick Google search suggests that it
doesn't).
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