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https://issues.apache.org/jira/browse/PHOENIX-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340282#comment-15340282
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Samarth Jain commented on PHOENIX-3010:
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But our general contract is that we upgrade the server side jar first and then
the client side. In the way you are suggesting, we would ned to upgrade the
client side jar first, right?
> Allow optional rolling restart for major release
> -------------------------------------------------
>
> Key: PHOENIX-3010
> URL: https://issues.apache.org/jira/browse/PHOENIX-3010
> Project: Phoenix
> Issue Type: Improvement
> Reporter: James Taylor
> Assignee: Samarth Jain
>
> If the major version number of the client does not match the major version of
> the server, the client is not allowed to connect to the server. However,
> sometimes a major release may make breaking changes to features that are not
> being used by users. In that case, an older client (i.e. 4.x) would work fine
> against a new server (i.e. 5.0). We should have a config parameter, something
> like {{phoenix.connection.allowPriorMajorVersion}} that allows this
> connection to take place, but defaults to false.
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