Product: Facebook's Cassandra - A Massive Distributed Store

Update 2: Presentation from the NoSQL conference: slides, video.
Update: Why you won't be building your killer app on a distributed hash table by Jonathan Ellis. Why I think Cassandra is the most promising of the open-source distributed databases --you get a relatively rich data model and a distribution model that supports efficient range queries. These are not things that can be grafted on top of a simpler DHT foundation, so Cassandra will be useful for a wider variety of applications.

James Hamilton has published a thorough summary of Facebook's Cassandra, another scalable key-value store for your perusal. It's open source and is described as a "BigTable data model running on a Dynamo-like infrastructure." Cassandra is used in Facebook as an email search system containing 25TB and over 100m mailboxes.

Google Code for Cassandra - A Structured Storage System on a P2P Network

SIGMOD 2008 Presentation.

Video Presentation at Facebook

Facebook Engineering Blog for Cassandra

Anti-RDBMS: A list of distributed key-value stores

Facebook Cassandra Architecture and Design by James Hamilton

Comments

[Marcus Ramberg]

Where is the actual source code for this project? You say it's open source and point at the google code site, but the subversion trunk there only contains wiki-content.

[Anonymous]

@Marcus
For reasons unknown to me, the code is located in tags/release-0.1.0 and not in trunk, as one would normally assume.

[Padraic Hannon]

Cassandra is now an Apache Incubator project: http://incubator.apache.org/cassandra/

[Christie Monteiro]

These are not things that can be grafted on top of a simpler DHT foundation, so Cassandra will be useful for a wider variety of applications.