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https://issues.apache.org/jira/browse/CASSANDRA-18300?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17782836#comment-17782836
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Maxwell Guo commented on CASSANDRA-18300:
-----------------------------------------
When downgrading, do we need to modify the release version in the system local
table and do some migration of system table data from a higher version of the
system table data to a lower version, because there are some useless new
columns, and of course There may be other things, which may need to be
discussed and thought about further. [~jlewandowski]
> Support robust downgradability
> ------------------------------
>
> Key: CASSANDRA-18300
> URL: https://issues.apache.org/jira/browse/CASSANDRA-18300
> Project: Cassandra
> Issue Type: Epic
> Reporter: Jacek Lewandowski
> Priority: Normal
>
> List of all the issues, improvements, assumptions and other things we should
> consider to allow the user to go back to the previous version without
> problems.
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