Appetizer: Rails 4.0 and Ruby 2.1: Speedy Fast!
I deployed Rails 4.0 to heroku and it was FAST. like woah fast. Let's show off! -- by @jwo
Entree: Cassandra Loves You
How Cassandra works, options for using it with Rails, what those look like, and in general, how the distributed problem set manifests itself in practice. --- by @foundev, Ryan Svihla
Cassandra is in use at Netflix, eBay, Twitter,Urban Airship, Constant Contact, Reddit, Cisco, OpenX, Digg, CloudKick, Ooyala, andmore companies that have large, active data sets. The largest known Cassandra cluster has over 300 TB of data in over 400 machines.