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https://issues.apache.org/jira/browse/PHOENIX-3010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15340674#comment-15340674
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Samarth Jain commented on PHOENIX-3010:
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[~mujtabachohan] - we need to restart region servers anyway when installing new
phoenix jars. We will now need an additional step of adding the config in
server side hbase-site.xml before doing the restart.
> 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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