Migrating Messenger storage to optimize performance

More than a billion people now use Facebook Messenger to instantly share text, photos, video, and more. As we have evolved the product and added new functionality, the underlying technologies that power Messenger have changed substantially. When Messenger was originally designed, it was primarily intended to be a direct messaging product similar to email, with messages waiting in your inbox the next time you visited the site. Today, Messenger is a mobile-first, real-time communications system used by businesses as well as individuals. To enable that shift, we have made many changes through the years to update the backend system. The original monolithic service was separated into a read-through caching service for queries; Iris to queue writes to subscribers (such as the storage service and devices); and a storage service to retain message history. This design optimized Messenger for a mobile-first world and helped fuel its success. To help improve Messenger


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