jms - What kind of messaging architectures are used in huge, scalable sites today? -

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sites twitter , facebook scale hundreds of thousands of users. of architectural overviews available online talks , slideshows. however, question more oriented towards messaging middleware/layer these sites use. understand different different sites - there common characteristics when using messaging technologies (e.g. jms) on highly scaled sites? more specifically, there use cases cannot handled traditional messaging solutions?

twitter switched scala middleware , got huge performance boost. high-scalability best authority on topic of scaling web applications.


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