Anyone have real world experience to share with HBase or Hypertable? Or Cassandra, for that matter. None of these projects strike me as "mature" software but I'd love to learn otherwise.
http://news.ycombinator.com/item?id=813528 http://news.ycombinator.com/item?id=813919
(I work for Rackspace on the Cassandra project, and we are in the early stages of deploying Cassandra internally too.)