I have written about Cassandra in the past. I have been using Cassandra actively for the past three years, and I am one of the big advocates of technology out there. However, as I have pointed in this blog and on my Twitter page - if you plan on scaling Cassandra out, be prepared to recruit an army of Java developers to do devops. Cassandra becomes a devops nightmare beyond 3-4 nodes. In this post I am going to try and explain why.