Huolala Tech

Jan 18, 2024 · Fundamentals

Why G1’s Humongous Objects Trigger Midnight Old‑Gen Spikes and How to Diagnose Them

This article walks through a real‑world G1 GC incident where massive humongous object allocations caused old‑generation memory spikes at night, explains the underlying JVM memory layout, shows how to trace the problem with heap dumps and monitoring data, and offers practical tips to avoid similar issues in Java applications.