Is it just me or is the reasoning behind the switch from postgres to mysql very vague? They describe a sharded mysql database... Sharding postgres isn&#x27;t necessarily any more difficult, instagram apparently uses it in a sharded manner with <i>many</i> shards. You&#x27;d think storing json in the pretty sweet jsonb column type in postgres would be a nice bonus for querying or indexing on.<p>I guess someone at uber must really like mysql, a good enough reason as any other I suppose. I&#x27;d love to hear about what other reasons as to why mysql turned out to be the choice here, as I&#x27;ve usually gone the other way (mysql to pgsql) for many of the great features and performance pgsql has.