Preventing Cache Stampedes at Scale

High-concurrency systems — especially retail, travel, ticketing, or any “hot product” scenarios — often face cache stampedes (also called thundering herd or dogpiling). When a cache entry expires, every server instance may simultaneously hit the database and recompute the same value. That results in: Unnecessary datastore I/O Increased latency CPU spikes Potential outages This article outlines a production-ready pattern that combines: