Yahoo's Cloud Storage Rupesh Chhatrapati We have built a massively parallel and geographically distributed database system for Yahoo!¹s web applications. It provides data storage organized as hashed or ordered tables, low latency for large numbers of concurrent requests including updates and queries, and novel consistency guarantees. It is a hosted, centrally managed, and geographically distributed service, and utilizes automated load-balancing and failover to reduce operational complexity. We will provide an overview of design and implementation of its table storage and replication layers.