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Re:Databases and Distributed Deadlocks: A FAQ by greenleafjacob on Thursday August 31, 2017 @10:09PM (#15145606)
Warning: Cassandra counters are not backed by CRDTs [1].

[1] https://aphyr.com/posts/294-jepsen-cassandra

Re:Databases and Distributed Deadlocks: A FAQ by iamaleksey on Friday September 01, 2017 @04:28AM (#15146981)
Except they are. Catalogued as δ-CRDT, under Lexicographic Counter in https://arxiv.org/pdf/1603.01529.pdf

edit: Although to be fair that blog post is ancient and covers Cassandra 2.0, now no longer supported. Counters were rewritten in Cassandra 2.1.