System Design Patterns: From Fundamentals to Real Systems
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Exactly-Once Semantics

1. The Incident

The store meters partner API usage and bills for it; a streaming job counts each partner's calls per day and feeds the invoices. A streaming job reads events from a log as they arrive and keeps running results. This is the most money-sensitive pipeline in the company; it has been wrong in both directions.

**Month one: overbilling

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