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https://issues.apache.org/jira/browse/CASSANDRA-20600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17947388#comment-17947388
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Jeremiah Jordan commented on CASSANDRA-20600:
---------------------------------------------
bq. Thinking more about this, there is nothing accord specific here. This is
more that a schema change in the log is no longer valid.
Looking over the code, thanks for the pointer [~samt] it is actually an accord
issue. The accord checks are in apply() rather than validate().
[https://github.com/apache/cassandra/blob/d08c0d6fbbe46485ff34b38d138e70b9d8d21796/src/java/org/apache/cassandra/cql3/statements/schema/CreateTableStatement.java#L176-L181]
> DB Crashes on startup if accord tables exist but accord is disabled
> -------------------------------------------------------------------
>
> Key: CASSANDRA-20600
> URL: https://issues.apache.org/jira/browse/CASSANDRA-20600
> Project: Apache Cassandra
> Issue Type: Bug
> Components: Accord
> Reporter: Jon Haddad
> Priority: Normal
>
> We should at least have a clear message why the DB isn't starting instead of
> an exception so the user knows this isn't a bug.
> I'm not sure if there's a better approach other than an error. Backing out
> of accord by disabling the config while there's tables seems like a
> significant user error so preventing startup might be the only sane thing we
> can do.
> {noformat}
> ERROR [main] 2025-04-25T14:01:08,040 CassandraDaemon.java:926 - Exception
> encountered during startup
> java.lang.IllegalStateException: Can't dereference Success for a rejected
> execution: INVALID: Cannot create table games.user_scores with transactional
> mode full with accord.enabled set to false
> at
> org.apache.cassandra.tcm.Transformation$Rejected.success(Transformation.java:177)
> at org.apache.cassandra.tcm.log.LogState.flatten(LogState.java:112)
> at
> org.apache.cassandra.tcm.log.LocalLog.replayPersisted(LocalLog.java:597)
> at org.apache.cassandra.tcm.log.LocalLog.ready(LocalLog.java:679)
> at
> org.apache.cassandra.tcm.Startup.initializeAsNonCmsNode(Startup.java:162)
> at org.apache.cassandra.tcm.Startup.initialize(Startup.java:110)
> at org.apache.cassandra.tcm.Startup.initialize(Startup.java:91)
> at
> org.apache.cassandra.service.CassandraDaemon.setup(CassandraDaemon.java:274)
> at
> org.apache.cassandra.service.CassandraDaemon.activate(CassandraDaemon.java:745)
> at
> org.apache.cassandra.service.CassandraDaemon.main(CassandraDaemon.java:899)
> {noformat}
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