☁️ Cloud & Infrastructure

Distributed Locks: The GC Pause That Tripled a Customer's Bill

Three identical support tickets hit in 60 seconds: one customer charged thrice for a single order. The culprit? A sneaky Redis lock expiry during a JVM GC pause.

DevTools Feed Apr 03, 2026 3 min read 13 views
Two microservices clashing over an expired Redis lock during JVM garbage collection pause

⚡ Key Takeaways

  • Distributed locks fail spectacularly under GC pauses and network delays, leading to real overcharges. 𝕏
  • Redlock debate: Practical for some, disastrous for safety-critical work without fencing. 𝕏
  • Future shift to idempotency and sagas will kill lock reliance in five years. 𝕏
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#distributed locks #distributed systems #microservices #redis redlock

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Originally reported by dev.to

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