Code Wrench

Jan 24, 2026 · Backend Development

Mastering Approximate Top‑K: Scalable Hotspot Detection for Go Backends

When a small fraction of requests overwhelms a system, understanding which endpoints, keys, or users cause the bottleneck is crucial; this article explains why traditional full‑count sorting fails at scale, introduces efficient approximate Top‑K algorithms such as fixed‑size min‑heap and Count‑Min Sketch, and provides production‑ready Go implementations with practical usage patterns and performance benchmarks.