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https://issues.apache.org/jira/browse/CASSANDRA-9704?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14652159#comment-14652159
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Aleksey Yeschenko commented on CASSANDRA-9704:
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It looks like {{PartitionUpdateSerializer.serialize()}} is not implemented for
{{version < MessagingService.VERSION_30}}. The code is [commented
out|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/partitions/PartitionUpdate.java#L704-L707]
and throwing {{UnsupportedOperationException}}, which would mean that 3.0
coordinators can't compatibly forward to 2.2 nodes.
> On-wire backward compatibility for 8099
> ---------------------------------------
>
> Key: CASSANDRA-9704
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9704
> Project: Cassandra
> Issue Type: Sub-task
> Reporter: Sylvain Lebresne
> Assignee: Tyler Hobbs
> Fix For: 3.0 alpha 1
>
> Attachments: 9704-2.1.txt
>
>
> The currently committed patch for CASSANDRA-8099 has left backward
> compatibility on the wire as a TODO. This ticket is to track the actual doing
> (of which I know [~thobbs] has already done a good chunk).
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