Top Architect
Dec 21, 2021 · Backend Development
Design and Technical Solutions for a High‑Concurrency Flash Sale (秒杀) System
This article analyzes the challenges of building a flash‑sale system—such as overselling, massive concurrent requests, URL exposure, and database strain—and presents a comprehensive backend design that includes separate databases, dynamic URLs, Redis clustering, Nginx load balancing, rate‑limiting, asynchronous order processing, and service degradation strategies.
NginxRate LimiterRedis
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