Dropbox saved millions building a custom load balancer

Dropbox created Robinhood, a custom load balancing system, to manage server loads efficiently. It uses dynamic weights to distribute requests across servers with varying capabilities. Robinhood's three main components are a load balancing service, a proxy, and a routing database. Implementation stabilized CPU usage across servers, reduced server size by 25%, and resulted in cost savings. This solution helped Dropbox better handle its 700 million users and over 550 billion stored files.