Code Farmer Manor Chronicle

Oct 7, 2026 · Backend Development

Mastering High-Concurrency Caching: Penetration, Breakdown, Avalanche & Hot Keys

This article explains four classic high-concurrency caching problems—cache penetration, breakdown, avalanche, and hot keys—their root causes, differences, and practical solutions including empty-value caching, Bloom filters, mutex locks, logical expiration, TTL jitter, multi-level caching, and cache-database consistency patterns.