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https://issues.apache.org/jira/browse/CASSANDRA-16048?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17216490#comment-17216490
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Marcus Eriksson commented on CASSANDRA-16048:
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Added a few nits on the commit, and, as Caleb and Sylvain mentioned, having
some logging around this would be good.
bq. I skipped adding a flag since we can't detect and "undo" updating the
tables that were updated.
Could you expand on this? Not sure I follow - sounds like having the flag would
be better?
> Safely Ignore Compact Storage Tables Where Users Have Defined Clustering and
> Value Columns
> ------------------------------------------------------------------------------------------
>
> Key: CASSANDRA-16048
> URL: https://issues.apache.org/jira/browse/CASSANDRA-16048
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/CQL
> Reporter: Jordan West
> Assignee: Jordan West
> Priority: Normal
> Fix For: 4.0-beta
>
>
> Some compact storage tables, specifically those where the user has defined
> both at least one clustering and the value column, can be safely handled in
> 4.0 because besides the DENSE flag they are not materially different post 3.0
> and there is no visible change to the user facing schema after dropping
> compact storage. We can detect this case and allow these tables to silently
> drop the DENSE flag while still throwing a start-up error for COMPACT STORAGE
> tables that don’t meet the criteria.
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