“Uber Engineering’s Schemaless storage system powers some of the biggest services at Uber, such as Mezzanine. Schemaless is a scalable and highly available datastore on top of MySQL¹ clusters. Managing these clusters was fairly easy when we had 16 clusters. These days, we have more than 1,000 clusters containing more than 4,000 database servers, and that requires a different class of tooling.”