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What should the architecture of your scalable, real-time, highly available service look like? There are as many options as there are developers, but if you are looking for a general template, this architecture as described by Prashant Malik, Facebook's lead for the Messages back end team, in Scaling the Messages Application Back End, is a very good example to consider.
Although Messages is tasked with handling 135+ billion messages a month, from email, IM, SMS, text messages, and Facebook messages, you may think this is an example of BigArchitecture and doesn't apply to smaller sites. Not so. It's a good, well thought out example of a non-cloud architecture exhibiting many qualities any mom would be proud of:
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