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https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207072#comment-13207072
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Doug Cutting commented on HADOOP-7557:
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> Not PB but the RPC engine can allow older impls to live side by side.
I'm not sure what you're saying. Would an unchanged 0.20 client still be able
to talk to a server with PB headers? Or would we backport the PB header stuff
to 0.20? Or something else?
> Make IPC header be extensible
> -------------------------------
>
> Key: HADOOP-7557
> URL: https://issues.apache.org/jira/browse/HADOOP-7557
> Project: Hadoop Common
> Issue Type: Sub-task
> Reporter: Sanjay Radia
> Assignee: Sanjay Radia
> Attachments: HADOOP-7557.patch, IpcHeader.proto, ipcHeader1.patch,
> ipcHeader2.patch
>
>
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