Still blows my mind that it took Uber so long to migrate away from a single db solution. The bit about wanting an event system to handle downstream trip process

Still blows my mind that it took Uber so long to migrate away from a single db solution. The bit about wanting an event system to handle downstream trip processing w/o having one failure block the whole job was shocking. I'm pretty sure they've seen a few iterations on their data stores. I remember attending a meetup at Urban Airship in 2012 or so where Uber engineers gave a presentation about a data store migration (I think from Mongo to MySQL)