Cassandra RubyGem on Mac OSX Lion

If you’re trying to run Apache Cassandra with the RubyGem, you may encounter an error similar to the following.

thrift_client(0.8.1 not ~> 0.7.0)

You can fix this by editing the RubyGem.

cd /Library/Ruby/Gems/1.8/gems/cassandra-0.12.1/lib/
vim cassandra.rb

Find the line which sets the dependency.

gem 'thrift_client', '~> 0.7.0'

Change it to the following.

gem 'thrift_client', '~> 0.8.0'

Your script should now run without an error.