Github user zsxwing commented on the pull request: https://github.com/apache/spark/pull/6457#issuecomment-141332000 > No, I mean executors. With akka out of the picture, the executor's RpcEnv does not need to listen for incoming connections anymore. The block manager listens on its own port, so even without an external shuffle service, you shouldn't need this (to correct my previous comment). Ah, so it means master/driver should run a RpcEnv server, and worker/executor should run a RpcEnv client? Never thought about it. I will investigate it later when removing Akka.
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