Gunnar Morling • 11/25/2025

On Idempotency Keys

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This technical article delves into implementing idempotency keys to achieve exactly-once processing in distributed systems. It explains the mechanism of using unique keys to detect and ignore duplicate messages, emphasizing atomic persistence. The analysis compares UUIDs (v4/v7) and monotonically increasing sequences as key strategies, discussing their trade-offs in storage and duplicate detection.

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#distributed systems #Idempotency #Message Processing
On Idempotency Keys

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