P.01Web Development/Architecture Patterns··5 min read
Exactly-Once vs At-Least-Once Delivery: What Your Message Queue Actually Guarantees
Almost every message queue that advertises 'exactly-once' delivery is actually giving you at-least-once delivery plus a mechanism for you to make your own handler idempotent. Here's the real distinction, why true exactly-once is so hard, and how to design for what you actually have.
BackendArchitectureCloud & Infrastructure
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