At SoundCloud RabbitMQ is used to process transcoder workloads in parallel and also to gather updates for user browsers. The use case is nicely laid out with diagrams and key points in a nice article
on Pivotal's blog. There's also a video of a presentation on the same topic, but for faster consumption of the material I recommend the article.
Pivotal Blog - Scaling with RabbitMQ @ SoundCloud
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