[jira] [Commented] (CASSANDRA-12697) cdc column addition still breaks schema migration tasks

["Gábor Auth (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16460947#comment-16460947 ] 

Gábor Auth commented on CASSANDRA-12697:
----------------------------------------

Hi guys,

I've tried to add a new DC to my cluster and I ran into a CDC bug via schema disagreement between the old DCs and the new DC (with version 3.11.0)...

I've diffed the good and the bad system_scheme tables. The only difference is the `cdc` field in three keyspaces (in `tables` and `views`):
- the value of `cdc` field on the good node is `False`
- the value of `cdc` field on the bad node is `null`

The value of `cdc` field on the other keyspaces is `null`. One or two years ago I've tried the CDC feature but switched off... after I updated the schema of the affected keyspaces on the new nodes with 'cdc=false' then everything is okay.

> cdc column addition still breaks schema migration tasks
> -------------------------------------------------------
>
>                 Key: CASSANDRA-12697
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12697
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Distributed Metadata
>            Reporter: Sylvain Lebresne
>            Assignee: Sylvain Lebresne
>            Priority: Major
>             Fix For: 3.10
>
>
> This is a followup of CASSANDRA-12236, which basically didn't fully fix the problem. Namely, the fix from CASSANDRA-12236 skipped the {{cdc}} column in {{SchemaKeyspace.addTableParamsToRowBuilder()}}, but that method isn't used by schema "migration tasks" ({{MigrationRequestVerbHandler}}, which instead directly send the content of the full schema table it reads from disk. So we still end up with a RTE like CASSANDRA-12236. 



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