How Momo Scales to Billions: High‑Availability Communication Architecture for Mobile Social Apps

Introduction

Momo, a social platform with hundreds of millions of users, demands extremely fast and stable communication. In this article, Technical Director Wang Chunlai delves into the communication protocol and architectural design principles that address the challenges of weak mobile networks and serve as a generic high‑availability solution for mobile games and other domains.

Handling 1.6‑1.7 billion daily requests is far from trivial. Wang summarizes the effort as continuous backend optimization—including communication, location‑based search, data‑center construction, server provisioning, and CDN—using a widely distributed design that emphasizes high availability. Starting from cloud hosts, Momo moved to six owned servers and now operates hundreds of servers, completing a large‑scale IT platform build‑out in just two years.

While many enterprises were skeptical about virtualization, Momo experienced its benefits early. Virtualized deployment boosted office efficiency and allowed rational allocation of storage, compute, and network resources. Using OpenStack, Momo can quickly allocate resources to database, cache, and application servers—tasks that once took hours now finish in minutes.

In the social app arena, Momo cannot ignore the pressure from WeChat, which boasts 600 million users. Wang notes that the user bases differ: WeChat focuses on communication among acquaintances, whereas Momo centers on social interaction with location‑based features. Momo continues to pursue differentiated development.

From an operations perspective, Momo leverages IT to drive product evolution. The team closely monitors user behavior data—such as activity in groups, preferred topics, and specific group creation requirements—to perform granular segmentation and fulfill deeper social needs, helping users build broader and more effective networks.