liandk

Oct 4, 2026 · Backend Development

High-Concurrency Flash Sale Architecture: Layered Rate Limiting, Overselling Prevention & Cache Protection

This article details a production-grade five-layer architecture for high-concurrency flash sale systems, covering traffic shaping via message queues, multi-level rate limiting, three-tier overselling prevention using Redis atomic operations and database optimistic locking, and solutions for cache penetration, breakdown, and avalanche, plus nine common failure scenarios and a troubleshooting SOP.