Programmer1970
May 25, 2026 · Backend Development
How a Full GC Spike Turned 50 ms P99 Latency into 3 s – Full Investigation
When a monitoring alarm showed the /api/order/create endpoint’s P99 latency jump from under 50 ms to over 3 s, the team traced the root cause to a Full GC storm caused by an unbounded static HashMap cache, using Arthas, heap dumps, MAT analysis, and finally applied both quick‑fix and permanent code changes to restore performance.
ArthasCaffeineEclipse MAT
0 likes · 8 min read