[jira] [Commented] (CASSANDRA-15703) When CDC is disabled bootstrapping breaks

["Josh McKenzie (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-15703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077522#comment-17077522 ] 

Josh McKenzie commented on CASSANDRA-15703:
-------------------------------------------

#1 seems both simpler and more logically correct IMO. We've essentially shifted the burden of discerning whether a node knows about a column in its local schema from the receiver to the sender (post 8099 and post 12697 as I understand it from memory long ago).

> When CDC is disabled bootstrapping breaks
> -----------------------------------------
>
>                 Key: CASSANDRA-15703
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-15703
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Consistency/Bootstrap and Decommission
>            Reporter: T Jake Luciani
>            Priority: Normal
>             Fix For: 3.11.x
>
>
> Related to CASSANDRA-12697
> There is an edge case left over.  If a cluster had enabled CDC on a table then subsequently set cdc=false, subsequent bootstraps break. 
>  
> This is because the cdc column is false on the existing nodes but null on the bootstrapping node, causing the schema sha to never match.
>  
> There are a couple possible fixes:
>   1.  Since 12697 was only about upgrades we can serialize the cdc column IFF the cluster nodes are all on the same version.
>   2.  We can force cdc=false on all tables where it's null.
>  
> I think #1 is probably simpler. #2 would probably cause more of the same problem if nodes are not all updated with the fix.
>  
>   



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