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https://issues.apache.org/jira/browse/SPARK-5124?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14352101#comment-14352101
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Shixiong Zhu commented on SPARK-5124:
-------------------------------------

The problem is that the message may come from caller.receive, but the callee 
wants to send the reply to caller.receiveAndReply.

However, I cannot find a use case now. But I find some RpcEndpoint may need to 
know the sender's address. So I added the sender method to RpcCallContext. And 
I also removed replyWithSender since it can be replaced with 
RpcCallContext.sender.sendWithReply(msg, self) now.

> Standardize internal RPC interface
> ----------------------------------
>
>                 Key: SPARK-5124
>                 URL: https://issues.apache.org/jira/browse/SPARK-5124
>             Project: Spark
>          Issue Type: Sub-task
>          Components: Spark Core
>            Reporter: Reynold Xin
>            Assignee: Shixiong Zhu
>         Attachments: Pluggable RPC - draft 1.pdf, Pluggable RPC - draft 2.pdf
>
>
> In Spark we use Akka as the RPC layer. It would be great if we can 
> standardize the internal RPC interface to facilitate testing. This will also 
> provide the foundation to try other RPC implementations in the future.



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