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At a Cloud Computing Meetup, Siddharth "Sid" Anand of Netflix, backed by a merry band of Netflixians, gave an interesting talk: Keeping Movies Running Amid Thunderstorms. While the talk gave a good overview of their move to the cloud, issues with capacity planning, thundering herds, latency problems, and simian armageddon, I found myself most taken with how they handle software deployment in the cloud.
I've worked on half a dozen or more build and deployment systems, some small, some quite large, but never for a large organization like Netflix in the cloud. The cloud has this amazing capability that has never existed before that enables a novel approach to fault-tolerant software deployments: the ability to spin up huge numbers of instances to completely run a new release while running the old release at the same time.
The process goes something like:
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