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We ran a Galera cluster for 4 days and it died on the first ALTER TABLE we did. Only option was to reduce it down to a Primary / Replica setup. I really can't recommend anyone using this.

Last time I looked at Galera it had a limit at 5TiB of data. Which is fine I guess.

In the Postgres space there is citusdb which provides multi master.

There is also BDR from 2ndquadrant if you want a paid/supported solution. https://www.enterprisedb.com/products/edb-postgres-distribut...

yeah, that's the use case "I run an application that requires or is highly optimised for MySQL".

how do multi master MySQL handles conflicts?