Raymond Ops

Aug 9, 2026 · Operations

How a Full Redis Connection Pool Triggered a Service Outage: Step‑by‑Step Investigation

An online education platform experienced a cascade failure when Redis reached its maxclients limit, causing authentication, session, and cache services to become unavailable; the article details the connection mechanism, root‑cause analysis, rapid mitigation steps, and long‑term best practices for preventing similar outages.