Update: Presentation from the NoSQL conference: slides, video 1, video 2.
Project Voldemort is an open source implementation of the basic parts of Dynamo (Amazon’s Highly Available Key-value Store) distributed key-value storage system. LinkedIn is using it in their production environment for "certain high-scalability storage problems where simple functional partitioning is not sufficient."
From their website:
They also have a nice design page going over some of their architectural choices: key-value store only, no complex queries or joins; consistent hashing is used to assign data to nodes; JSON is used for schema definition; versioning and read-repair for distributed consistency; a strict layered architecture with put, get, and delete as the interface between layers.
Just a hint when naming a project: don't name it after one of the most popular key words in muggledom. The only way someone will find your genius via search is with a dark spell. As I am a Good Witch I couldn't find much on Voldemort in the real world. But the idea is great and is very much in line with current thinking on scalable database design. Worth a look.