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

["Berenguer Blasi (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-15703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17295134#comment-17295134 ] 

Berenguer Blasi commented on CASSANDRA-15703:
---------------------------------------------

Mmmm can anybody help with repro steps please? The matrix of combinations {{cdc true/false * cdc yaml true/false * DC same/diff * version same/diff}} is just too big and everything seems to work so far. I've also been reading too much about it so I might be missing the obvious

Method:
 - Start node1 and run:
{noformat}
CREATE KEYSPACE test WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor' : 1};
CREATE TABLE test.foo (a int, b text, PRIMARY KEY(a)) WITH cdc=true;
ALTER TABLE test.foo WITH cdc=true;
ALTER TABLE test.foo WITH cdc=false;
insert into test.foo (a, b) values (1, 'test');
{noformat}

 - Start node2, wait for bootstrap to complete and node to join successfully.

3.11:
 - 2 nodes on same DC works
 - 2 nodes on diff DC works

4.0:
 - 2 nodes on same DC works
 - 2 nodes on diff DC works

Mixed:
 - Create in 3.11 & sstableupgrade to 4.0. Start a second 4.0 node and it works

> 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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