After reading this: http://aphyr.com/posts/294-call-me-maybe-cassandra
I decided to try to break row isolation myself: https://github.com/ramonza/cassandra-row-isolation To run it you just need a single node running on localhost. Tested with 2.0.1. The test fails very consistently. Row isolation seems to be broken. I would like to log a ticket as I couldn't find one addressing this issue. I'm also keen to help out fixing this.