Code Farming

Jul 26, 2026 · Backend Development

How Is a Red Envelope System Designed for High‑Concurrency?

This article breaks down the end‑to‑end design of a high‑traffic red‑envelope service, covering its three‑stage lifecycle, a fair double‑mean allocation algorithm, the need to separate grabbing from settlement, and how Redis, Lua scripts, and message queues handle massive concurrent requests.