How Reddit Scaled to Millions of Decisions Per Second

Reddit's journey in scaling its advertising platform's authorization system exemplifies the challenges and innovative solutions required to handle millions of decisions per second. Faced with issues such as dynamic user hierarchies, customizable permissions, and the need for rapid decision-making, Reddit opted to decouple policy from code, inspired by Google's Zanzibar model, to enhance system scalability and flexibility. By employing Open Policy Agent (OPA), Reddit managed to separate policy decision-making from enforcement, allowing for centralized rule management and adaptability. This approach not only met Reddit's immediate needs by achieving low latency and high reliability but also set a foundation for future growth. The implementation of Open Policy Administration Layer (OPAL) as an open-source solution offers similar capabilities, providing real-time updates and synchronization with policy engines like OPA and AWS Cedar, enhancing flexibility and accessibility for developers. Reddit's success underscores the importance of strategic architectural decisions in building scalable and efficient systems, offering valuable insights into managing complex authorization challenges.

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