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https://issues.apache.org/jira/browse/CASSANDRA-20600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17947379#comment-17947379
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Jon Haddad commented on CASSANDRA-20600:
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[~dcapwell] Yes - I had created tables with accord enabled.
The accord specific part is really just the messaging. We should tell users
clearly that the cluster is using accord, it's disabled in the config, and it
needs to be re-enabled to start up.
> 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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