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I started looking into Cassandra and I am really impressed with what it provides, but at the same time I read about how Reddit had a fire drill after migrating to Cassandra, and about twitter deciding to not using it for tweets. Although those were about a year ago or so, I am wondering if the latest version is ready for prime time yet?
Netflix has talked extensively about how they are moving from Oracle and SimpleDB entirely to Cassandra.
Twitter was also at the Cassandra Summit a few weeks ago talking about how they use Cassandra for multiple projects; Reddit had some early problems with being under-capacity, but later said, “Our traffic more than tripled [in 2010], and the transparent scalability afforded to us by Apache Cassandra is in large part what allowed us to do it on our limited resources.”
There are many other companies using Cassandra (and DataStax customers are the tip of the iceberg).
In short, Cassandra is solving real problems for real companies. Just don’t go into it expecting MySQL and you’ll be fine. The DataStax documentation is a good starting point.
(Chris is mistaken about API stability: we were clear that after 0.7 we would be strict about maintaining backwards compatibility, and we have, even for “maintenance” operations like schema updates and mixed-version cluster operation for downtime-free upgrades. I would also note that unlike many “NoSQL” databases, Cassandra has always taken data durability seriously.)