You’re seeing information for Japan . To see local features and services for another location, select a different city. Show more What happens when you have to migrate hundreds of millions of rows of data and more than 100 services over several weeks while simultaneously keeping Uber running for millions of riders? This is the story of how dozens of engineers helped Uber move to Mezzanine in 2014.
![Project Mezzanine: The Great Migration](https://cdn-ak-scissors.b.st-hatena.com/image/square/c70f305cbf4178fb0164ae7ba118270740bce0db/height=288;version=1;width=512/https%3A%2F%2Fblog.uber-cdn.com%2Fcdn-cgi%2Fimage%2Fwidth%3D828%2Cheight%3D388%2Cquality%3D80%2Conerror%3Dredirect%2Cformat%3Dauto%2Fwp-content%2Fuploads%2F2015%2F07%2Fheader-of-wildebeest-migration.png)