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https://issues.apache.org/jira/browse/BOOKKEEPER-558?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13562570#comment-13562570
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Matteo Merli commented on BOOKKEEPER-558:
-----------------------------------------

Is some sort of compatibility taken into account on this issue? It would be 
nice to be able to upgrade to the protobuf enabled bookie without having to 
shutdown the service. 

Would it be possible/reasonable to have the bookie understand both protocol 
versions during a release cycle?
                
> change bookkeeper request/response protocol to use protobuf
> -----------------------------------------------------------
>
>                 Key: BOOKKEEPER-558
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-558
>             Project: Bookkeeper
>          Issue Type: New Feature
>          Components: bookkeeper-client, bookkeeper-server
>            Reporter: Sijie Guo
>            Assignee: Aniruddha
>             Fix For: 4.3.0
>
>
> Change the protocol to protobuf, which is easy to extend the protocol in 
> future.
> [~i0exception] already did some works for it. he would generate the patch 
> later. created this jira in case of duplicated works.

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