Asynchronous computing @Facebook: Driving efficiency and developer productivity at Facebook scale

This post details the evolution of Meta's 'Async' system, which handles billions of asynchronous user requests. It describes the challenges of scaling the original centralized, first-come-first-served system, the subsequent development of a more robust, multitenant architecture, and key innovations like delay tolerance, optimized capacity management (queueing, time shifting, batching), and capacity regulation. This directly contributes to the site reliability by ensuring efficient and prioritized processing of critical background tasks.