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https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13126789#comment-13126789
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Doug Cutting commented on HADOOP-7557:
--------------------------------------

> Currently it does support multiple payload types

Are you referring to Avro?  If so, that's not quite right.  Avro requests and 
responses are wrapped in a Writable.  The wire format of all requests and 
responses is currently Writable.  AvroRpcEngine layers on top of the 
WritableRpcEngine, embedding Avro in the Writable RPC format on the wire.
                
> Make  IPC  header be extensible
> -------------------------------
>
>                 Key: HADOOP-7557
>                 URL: https://issues.apache.org/jira/browse/HADOOP-7557
>             Project: Hadoop Common
>          Issue Type: Improvement
>            Reporter: Sanjay Radia
>            Assignee: Sanjay Radia
>         Attachments: HADOOP-7557.patch, IpcHeader.proto, ipcHeader1.patch, 
> ipcHeader2.patch
>
>


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