[jira] [Created] (CASSANDRA-14897) In mixed 3.x/4 version clusters write tracing and repair history information without new columns

["Ariel Weisberg (JIRA)" <ji...@apache.org>]

Ariel Weisberg created CASSANDRA-14897:
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             Summary: In mixed 3.x/4 version clusters write tracing and repair history information without new columns
                 Key: CASSANDRA-14897
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14897
             Project: Cassandra
          Issue Type: Bug
          Components: Distributed Metadata
            Reporter: Ariel Weisberg
            Assignee: Ariel Weisberg
             Fix For: 4.0


In CASSANDRA-14841 I stopped it from writing to those tables so it wouldn't generate any errors. Aleksey pointed out I could write just the old columns. 

If a user manually adds the new columns to the old version nodes before upgrade they will be able to query this information across the cluster. This is a better situation then making it completely impossible for people to run repairs or perform tracing in mixed version clusters.

This would avoid breaking repair and tracing in mixed version clusters.

I also want to properly document how to do this and maybe even provide a script people can run to add the columns to old nodes.





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