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From "Jason Brown (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14897) In mixed 3.x/4 version clusters write tracing and repair history information without new columns
Date Thu, 29 Nov 2018 14:02:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14897?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16703219#comment-16703219
] 

Jason Brown commented on CASSANDRA-14897:
-----------------------------------------

+1 lgtm

> 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
>            Priority: Major
>              Labels: 4.0-pre-rc-bugs
>             Fix For: 4.0
>
>         Attachments: 14897.diff
>
>
> 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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