System Design Patterns: From Fundamentals to Real Systems
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Stream Processing

1. The Incident

The fraud team's nightly batch job scans the day's orders and identifies coordinated stolen-card activity with 99% precision. Tuesday's run flags thirty fraudulent orders from one group; all orders were placed between 3:40 and 3:55 PM and shipped by 6 PM.

The job runs at 2 AM, eight hours after the goods have left the warehouse. **The answer is correct but arrives too late to prevent shipment; a batch architecture cannot meet this question's deadline

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