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// Topic: debugging-async-race-conditions
// From: Company Internal Wiki, Engineering Team
// PROBLEM: Race condition in async payment processing
// Multiple concurrent requests can create duplicate transactions
// SOLUTION: Implement distributed lock with Redis
const lockKey = `payment:${userId}:${orderId}`;
const lock = await redis.set(lockKey, '1', 'NX', 'EX', 10);
if (!lock) throw new Error('Payment in progress');
// Process payment...
await redis.del(lockKey); // Release lock

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