System Design Patterns: From Fundamentals to Real Systems
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1. The Incident

The stateless fleet behind its balancer runs eight servers. It is sized for the evening peak of 4,000 requests per second. It is a fine fleet. It has two bad habits, and both showed up in the same month.

The 4 AM bill. Average traffic is about 900 requests per second. The evening peak is 4 to 5 times that, exactly as the arithmetic lesson's peak rule promised

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