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https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13120458#comment-13120458
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Doug Cutting commented on HADOOP-7557:
--------------------------------------

> PB makes it easy to extend the headers.

Map<String,ByteBuffer> is naturally extensible too.

It is a mistake to use a particular serialization system to specify a container 
for serialized data that's meant to be independent of any particular 
serialization system.
                
> Make  IPC and RPC headers 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: IpcHeader.proto
>
>


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