Is Cassandra production ready for Ruby on Rails?

Question

I\'m working on a project that is considering using Cassandra as a database. We would like to eventually migrate to Cassandra even if we use MySQL to start with, given its

Answer 1

If you then change to Cassandra, you will have to change all your models to a NoSQL

This isn't true at all. If you have programmed in such a way that your MySQL db does loads of joins, then yes, you may have a problem. We avoided joins as much as we could from the beginning when we started the MySQL route. Then when we started migrating to Casandra it was fairly easy, we did so with 1 model only at first. Then say 4 models in one go. Etc. Works well. In fact, when you read the interview with twitter you'll notice they ran MySQL and Casandra in parallel for the same model for a while: http://nosql.mypopescu.com/post/407159447/cassandra-twitter-an-interview-with-ryan-king.

As to Authlogic, you can keep that part in mySQL for as long as you like, just keep it loosely coupled with your Cassandra data.