In 2007, Amazon published a paper about “Dynamo,” a high-availability storage system. A number of NoSQL databases were created based on this paper and paradigm, with great success. One of them is Riak, a distributed, open-source NoSQL key-value store developed by Basho. In this talk, Andy Gross (who was then chief architect of Riak) describes Dynamo, Riak, and where things stood in 2012 (i.e., 2.5 years ago) in contrast with the original Amazon paper. While Riak has advanced since then, this talk introduces both Dynamo and Riak, and how we can think about distributed systems.