We can deploy new versions of our software, make database schema changes, or even rotate our primary database server, all without failing to respond to a single request. We can accomplish this because we gave ourselves the ability suspend our traffic, which gives us a window of a few seconds to make some changes before letting the requests through. To make this happen, we built a custom HTTP server and application dispatching infrastructure around Python’s Tornado and Redis.
— Dan Manges, Braintree
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