WeChat Backend Team

Jun 14, 2016 · Backend Development

How WeChat Generates Trillions of Sequence Numbers with Sub‑Millisecond Latency

This article explains how WeChat’s seqsvr service generates trillions of per‑user sequence numbers with sub‑millisecond latency, detailing its core architecture, pre‑allocation and section‑sharing strategies, engineering implementation with StoreSvr and AllocSvr, and the evolution of its disaster‑recovery designs from primary‑backup to embedded routing tables.