System Design Patterns: From Fundamentals to Real Systems
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Stream Processing

1. The Incident

The fraud team's nightly batch job works well: it scans the day's orders and finds stolen-card rings with 99% precision. Tuesday's run flags thirty fraudulent orders from one card ring, all placed between 3:40 and 3:55 PM, all shipped by 6.

The job runs at 2 AM. The goods left the warehouse eight hours before the answer arrived. **The answer was correct, and useless: the question had a deadline, and a batch architecture cannot meet it

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