Homebrew/homebrew-versions — pull request #542 by danapsimer (2014-10-13 18:53:11+00:00)
Title: Cassandra 2.0.x Formula

I copied the formula from the latest version of cassandra.rb that installed a version of 2.0.x in the main homebrew, modified the class name, and added a conflicts_with entry. I have successfully installed version 2.0.9 on my box.