Github user zsxwing commented on the pull request: https://github.com/apache/spark/pull/10261#issuecomment-164037328 @vanzin I saw your following comment in https://github.com/vanzin/spark/commit/3848bf5e5bee4aa132aa001baab41dc58d39e5c5#diff-acd05d6d379b6ef6ccf36bd3db5614f6R69 ``` Because the messages used to register workers and applications were one-way messages, though, "receive" was used, and that information was not available. So now those messages are send using "ask", which looks a bit awkward but is simpler than changing the RpcEnv API so that the client address is available in the "receive" method. ``` But I don't get it. The communication in master-worker, worker-driver and master-driver are all in non-client mode. So for one-way messages, `RequestMessage.senderAddress` is the RpcEnv listening address. If we maintain the address relation like this PR, RpcEndpoint doesn't need to worry about the address issue even for `one-way` messages. Right?
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