What did the team at Yahoo do when they realized they had an old proprietary back-end application running their core search business? They moved to an open source map reduce implementation from the Apache Software Foundation named Hadoop. This is a huge move and shows that sometimes even a core piece of your business is better accomplished with software that someone else has built. In Yahoo’s case they were able to accomplish the same tasks 34% faster on their new 10,000 core Linux cluster using Hadoop.