Simon Willison’s Weblog

reddit’s May 2010 “State of the Servers” report. An interesting Cassandra war story: Cassandra scales up, but it doesn’t scale down very well: running with just three nodes can make recovery from problems a lot more tricky. 18th May 2010, 6:37 pm

Reddit is now running on Cassandra. Migrating their persistent cache over from memcacheDB to Cassandra took one developer just ten days. 13th March 2010, 12:14 am

Looking to the future with Cassandra. Digg are now using Cassandra for their “green badge” (one of your friends have dugg this story) feature—the resulting denormalised dataset weighs in at 3 TB and 76 billion columns. 9th September 2009, 9:26 pm

Up and running with Cassandra. Twitter are beginning to use Cassandra, the open source branch of Facebook’s BigTable-like non-relational database. Evan Weaver explains how to get started with it, but warns that it’s not yet a good idea to trust data to it without having a full backup in an unrelated storage engine. 7th July 2009, 11:18 am