Don’t Settle for Eventual Consistency
Wyatt Lloyd, Michael J. Freedman, Michael J Kaminsky, David G. Andersen · Queue · 2014
Geo-replicated storage provides copies of the same data at multiple, geographically distinct locations. Facebook, for example, geo-replicates its data (profiles, friends lists, likes, etc.) to data centers on the east and west coasts of the United States, and in Europe. In each data center, a tier of separate Web servers accepts browser requests and then handles those requests by reading and writing data from the storage system.