The server is node.js running socket.io. It reads from a capped MongoDB database with a tailable cursor. A secondary set of servers (it happens to be in Ruby) originally wrote to the database.
Note: Sequence numbers may not be unique.
The node.js and Ruby components are running on Heroku's Celedon Cedar stack. The MongoDB database is hosted at MongoLab. https://github.com/mongolab/tractorpush-server for more information.
Original Demo: 2012 March
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