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https://issues.apache.org/jira/browse/HADOOP-7557?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207004#comment-13207004
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Sanjay Radia commented on HADOOP-7557:
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>Sanjay> ... can help us provide 20 compatibility
>I'm confused. If you switch the RPC headers to protobuf how can you provide 20
>compatibility?
Not PB but the RPC engine can allow older impls to live side by side.
>The reason we removed Avro was that implementing RpcEngine alone was no longer
>sufficient: there were assumptions that Protobuf was used in other places in
>the code. RpcEngine is currently a broken abstraction, providing a false claim
>of plugability.
Doug your model was that setting a single flag would allow one to switch from
one serialization to another.
The model that was implemented allowed one use one or another engine but one
had to have code to do that.
> 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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