This was actually previously discussed by Twitter's Evan Weaver. I can't find the article I'm thinking of, but this is close: http://blog.evanweaver.com/article

This was actually previously discussed by Twitter's Evan Weaver. I can't find the article I'm thinking of, but this is close: http://blog.evanweaver.com/articles/2009/07/06/up-and-running-with-cassandra/ http://blog.evanweaver.com/articles/2009/07/06/up-and-runnin... My understanding is that it came down to Cassandra being the only one that was well tested in multi-datacenter configurations. I think there were other reasons, but that was the big one.