title: Which is more scalable with Spark 1.6 (RPC): Netty or AKKA?
body: <p>Spark 1.6 can be configured to use AKKA or Netty for RPC. In case Netty is configured, does that mean that Spark runtime does not employ the actor model for messaging (e.g. between workers and driver blockmanagers) or even in case of netty configuration, a custom simplified actor model is used by relying on Netty. </p>
  
  <p>I think AKKA itself relies on netty and Spark uses only a subset of AKKA. Still,  is configuring AKKA is better for scalability (in terms of number of workers) as compared to netty? any suggestion on this particular spark configuration?</p>