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https://issues.apache.org/jira/browse/HADOOP-9163?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13579449#comment-13579449
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Sanjay Radia commented on HADOOP-9163:
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Todd, given that we are making other changes that break wire compatibility, I 
would like to make this change since it keeps things cleaner and consistent 
with the rpc response header and makes minimizing  buffer copies simpler; 
Devraj has noted above that he is doing the same for HBase rpc.
In light of that I am posting a patch for moving the rpc msg out of the header.
                
> The rpc msg in  ProtobufRpcEngine.proto should be moved out to avoid an extra 
> copy
> ----------------------------------------------------------------------------------
>
>                 Key: HADOOP-9163
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9163
>             Project: Hadoop Common
>          Issue Type: Sub-task
>            Reporter: Sanjay Radia
>


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