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Temporary regression after upgrading to 2.1.X or 2.2.X


Hi,

This regression can happen when:
 - Upgrading from any 2.1 version (till 2.1.15) to latest 2.1.20
 - Upgrading from any 2.2 version (till 2.2.7) to latest 2.2.12
 - And having a descending clustering key
 - And using CAS

Note that once SSTables are upgraded, the problem disappears.

A ticket has been opened here:
https://issues.apache.org/jira/browse/CASSANDRA-14462
And a patch has been proposed (quite a simple one).

I'd be glad if someone would like to review/help.

Thanks
Fabien