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https://issues.apache.org/jira/browse/CASSANDRA-12236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15405856#comment-15405856
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Sylvain Lebresne commented on CASSANDRA-12236:
----------------------------------------------
bq. Absolute most of them have been failing since before CDC AFAIK
I don't know. The test report for 3.7, which is
[here|https://docs.google.com/document/d/16xfq7xeLuD93EVIery0VQLMHMkOfYp7wlyQ7cSg0xwI/edit#heading=h.a7qrmlkpqup2],
pretends that not that long ago there was only 2 upgrade tests failures. Maybe
it's not accurate, and I'll admit I'm a little skeptical of only 2 failures,
but it would sound like we have add a big increase in those failures in the
last 2 months. Doesn't prove at all that it's CDC related though.
> 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
> Assignee: Sylvain Lebresne
> Fix For: 3.8, 3.9
>
> Attachments: 12236.txt
>
>
> 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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