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https://issues.apache.org/jira/browse/CASSANDRA-12236?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15395897#comment-15395897
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Sylvain Lebresne commented on CASSANDRA-12236:
----------------------------------------------
No, I still don't know how to run those upgrade tests (I was told something
about creating a branch with name starting with {{upgrade_}}, which I tried
yesterday, but either that didn't worked or I don't know where or when that
triggers the tests). In any case, it's worth noting I updated the branch today
to
1) make the {{RowUpdateBuilder}} in the tests be a thin wrapper over the newly
added builder, to address Jake's comment above. I still kept the
{{RowUpdateBuilder}} class cause it's used by many tests and I didn't think it
was a good use oa my time to go modify all those tests for no particular
reason. It's just a pretty minor test "helper" now.
2) while working on that I noticed that there was another reason why all the
columns were actually send, and that's because the {{unfilteredIterator()}}
method in {{PartitionUpdate}}, which is used during serialization, was
basically overriding the columns used to be all columns. I fixed that too.
Anyway, I think the branch is more of less complete, but I just got the result
of the last test run (normal tests, not upgrade ones) and it's not clean so I
must have broken something in the tests. This will have to wait tomorrow
however for me to look at it. Still very much interested in understanding how
to run the upgrade test on CI 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.x
>
> 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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