Yes, absolutely! The caveats are relevant to distributed locking, though: sharding would help scale out a locking system horizontally, but each subset of keyspa

Yes, absolutely! The caveats are relevant to distributed locking, though: sharding would help scale out a locking system horizontally, but each subset of keyspace would still be a non-distributed locking service. Primary-secondary replication doesn't (as far as I can tell!) offer the necessary invariants to act as a locking service - at least, not when employing the straightforward technique GP mentions.