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https://issues.apache.org/jira/browse/BOOKKEEPER-589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13608737#comment-13608737
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Ivan Kelly commented on BOOKKEEPER-589:
---------------------------------------

I did try this, and almost got it to work. It's messy though. I can try to 
clean it up, but it does require a bit of hackery. I'll post a patch for it in 
any case, and we can discuss it then.
                
> Release notes update for non-BC changes
> ---------------------------------------
>
>                 Key: BOOKKEEPER-589
>                 URL: https://issues.apache.org/jira/browse/BOOKKEEPER-589
>             Project: Bookkeeper
>          Issue Type: Sub-task
>            Reporter: Ivan Kelly
>            Assignee: Ivan Kelly
>            Priority: Blocker
>             Fix For: 4.3.0
>
>
> 4.3.0 client will not be able to connect to 4.2.0 servers, due to something 
> stupid in the protocol version handling. 4.2.0 and lower will blindly reject 
> any messages which have a protocolVersion higher than that it's current 
> version, even if the data format has not changed. The release notes should 
> reflect this. Also, think about how the protocolVersion is used some more.

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