Rare Earth Juejin Tech Community

Oct 13, 2025 · Backend Development

How Arthas Saved a Double‑11 Sale: Debugging a Thread‑Pool Nightmare

During a Double‑11 promotion, a massive request timeout caused order success rates to plunge, but by using Arthas, jstack, and targeted code analysis, the team identified a non‑thread‑safe HashBiMap in a global cache, halted the outage, and implemented fixes to prevent future failures.