Simon Willison’s Weblog

5 items tagged “cassandra”

What are the advantages and disadvantages of using MongoDB vs CouchDB vs Cassandra vs Redis?

I see Redis as a different category from the other three—kind of like you wouldn’t say “what are the advantages of MySQL v.s. Memcached”. Redis makes an excellent complement to pretty much any other persistent storage mechanism. I expanded on this here: http://simonwillison.net/2009/Oc...

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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