The end of April 2011 witnessed an interesting event. Amazon’s Elastic Compute Cloud (EC2) service was struck by a large scale outage that lasted for 4 long days. While Amazon scampered around to deal with the worst outage in cloud’s history, the world watched on with fascinated horror. Nobody had ever thought that a cloud computing giant like Amazon would encounter an outage. But it did and it took down almost 70 sites with it including bigwigs like FourSquare, Reddit, Quora, parts of New York Times, and more.