A Short on the Pinterest Stack for Handling 3+ Million Users

Pinterest co-founder Paul Sciarra shared a bit about their stack on Quora:

• Python + heavily-modified Django at the application layer
• Tornado and (very selectively) node.js as web-servers.  
• Memcached and membase / redis for object- and logical-caching, respectively.  
• RabbitMQ as a message queue.  
• Nginx, HAproxy and Varnish for static-delivery and load-balancing.
• Persistent data storage using MySQL.  
• MrJob on EMR for map-reduce.
• Git.

Alex Popescu has created a cool diagram of the setup and provided some thoughtful analysis as well.