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.
⚡ Key Takeaways
- Distributed locks fail spectacularly under GC pauses and network delays, leading to real overcharges.
- Redlock debate: Practical for some, disastrous for safety-critical work without fencing.
- Future shift to idempotency and sagas will kill lock reliance in five years.
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Originally reported by dev.to
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