[jira] [Commented] (CASSANDRA-12236) RTE from new CDC column breaks in flight queries.

["Joshua McKenzie (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-12236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15384412#comment-15384412 ] 

Joshua McKenzie commented on CASSANDRA-12236:
---------------------------------------------

To clarify, this has nothing to do with CDC other than it being the first feature that's changed system tables since 3.0 hit. In a post CASSANDRA-8099 world, the fact that we send across all system tables and reject queries with unknown columns means that any changes to the system schema would cause this. CDC just happens to be the first feature we've added since then that changes schema.

 Also - at the time that I added that message to NEWS.txt, from discussion offline we didn't realize those exceptions would lead to internode communication breaks.

> RTE from new CDC column breaks in flight queries.
> -------------------------------------------------
>
>                 Key: CASSANDRA-12236
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12236
>             Project: Cassandra
>          Issue Type: Bug
>            Reporter: Jeremiah Jordan
>            Priority: Blocker
>             Fix For: 3.8
>
>
> This RTE is not harmless. It will cause the internode connection to break which will cause all in flight requests between these nodes to die/timeout.
> {noformat}
>     - Due to changes in schema migration handling and the storage format after 3.0, you will
>       see error messages such as:
>          "java.lang.RuntimeException: Unknown column cdc during deserialization"
>       in your system logs on a mixed-version cluster during upgrades. This error message
>       is harmless and due to the 3.8 nodes having cdc added to their schema tables while
>       the <3.8 nodes do not. This message should cease once all nodes are upgraded to 3.8.
>       As always, refrain from schema changes during cluster upgrades.
> {noformat}



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