Sequence Mechanism

Tencent Cloud Developer

Mar 28, 2024 · Backend Development

WeChat Message Sending and Receiving Architecture (2014)

WeChat’s 2014 messaging system routes outbound texts from a phone through ConnectSvr to SendSvr, stores them in MsgStore, notifies PushSvr to deliver via long‑connection or third‑party push, and retrieves them through ReceiveSvr, using per‑user 32‑bit sequence numbers to guarantee real‑time delivery and prevent any message loss across devices.