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https://issues.apache.org/jira/browse/BOOKKEEPER-589?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13607757#comment-13607757
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Sijie Guo commented on BOOKKEEPER-589:
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one possible idea to keep 4.3.0 backward compatibility, is detecting BadVersion
exception and build old version package. we could consider introducing some
kind of handshake request for establishing connections to bookies. And I think
it would be helpful for authentication.
> 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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