System Design Patterns: From Fundamentals to Real Systems

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Stream Processing

1. The Incident

The fraud team's nightly batch job is a good one: it scans the day's orders, finds the stolen-card rings, flags them with 99% precision. Tuesday's run flags thirty fraudulent orders from one card ring: 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 perfect, and useless: the question had a deadline, and the pile-based architecture structurally cannot meet it

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