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 were placed between 3:40 and 3:55 PM, and 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