---
title: Runbook — CACHE_STAMPEDE_LOCK_TIMEOUT (캐시 스탬피드 락 타임아웃)
category: TRANSIENT_DEPENDENCY
error_codes: [CACHE_STAMPEDE_LOCK_TIMEOUT]
severity: P2
owner: oncall
last_updated: 2026-06-15
status: stub
---

# Runbook: CACHE_STAMPEDE_LOCK_TIMEOUT (`runbook://cache/stampede-lock-timeout`)

## Symptoms

- HTTP 503 with `error.code=CACHE_STAMPEDE_LOCK_TIMEOUT`
- Multiple concurrent cache misses on same key; lock contention

## Diagnosis

- Check cache hit ratio metrics
- Identify cache keys with high miss rates

## Action

- Verify stampede lock TTL is configured appropriately
- Pre-warm cache for high-traffic keys on startup

## Escalation

- Escalate if backend load spike accompanies stampede

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> **Stub**: Phase D2 — author body after domain adoption. (feature-operational-runbook-contract D9)