&gt; Clustered relational DBs are really remarkably hard to get right.<p>That is probably be true, but I&#x27;d like to point out that clustered non-relational DBs are also really remarkably hard to get right, it&#x27;s just a hard problem to solve.<p>The tradeoffs you make with a non relational DB to make this easier are usually also available in relational DBs. It&#x27;s not like Galera is your only choice.