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How To Process Events Exactly-Once
- To process events exactly-once, leverage the combination of at-least-once delivery and idempotence.
- Exactly-once processing is theoretically impossible in distributed systems.
- Designing a message receiver to be idempotent allows multiple deliveries of a message without any effect.
- DBOS event receivers, like for Kafka, generate a unique key and use it as an idempotency key for processing workflow.
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