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https://issues.apache.org/jira/browse/CASSANDRA-14879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17463468#comment-17463468
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patrick lee commented on CASSANDRA-14879:
-----------------------------------------
take a look at [https://github.com/apache/cassandra/pull/1369], this was the
best place I found to add the log statement but open there are any other
suggestions.
I added in logging out the user and ip as for me it is good to have that info
also.
> Log DDL statements on coordinator
> ---------------------------------
>
> Key: CASSANDRA-14879
> URL: https://issues.apache.org/jira/browse/CASSANDRA-14879
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/CQL
> Reporter: Sylvain Lebresne
> Assignee: patrick lee
> Priority: Low
> Labels: AdventCalendar2021, lhf
> Fix For: 4.x
>
>
> People sometimes run into issues with schema, and that is often because they
> do concurrent schema changes, which are just not supported and we should fix
> that someday, but in the meantime, it's not always easy to even check if you
> may indeed have had concurrent schema changes.
> A very trivial way to make that easier would be to simply log DDL statements
> on the coordinator before they are executed. This is likely useful info for
> operators in the first place, and would allow in most case to track if
> concurrent schema was the likely cause of a particular issue seen.
> +Additional info for newcomers:+
> In order to implement this change you will need to modify
> {{org.apache.cassandra.cql3.QueryProcessor}} to log the schema change before
> it is executed.
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