The Evolution of Caching Libraries in Go

A comprehensive analysis of Go caching library evolution, comparing on-heap vs off-heap approaches and examining major libraries like Ristretto, Theine, Otter v1/v2, and Sturdyc. The article details each library's advantages, disadvantages, and design trade-offs, covering key concepts like eviction policies (LRU, LFU, TinyLFU, W-TinyLFU), throughput optimization, hit rate performance, and advanced features like cache stampede protection and refreshing. Otter v2 emerges as the most feature-complete solution, implementing adaptive W-TinyLFU and drawing inspiration from Java's Caffeine library.