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← all concepts

At-most-once delivery.

also: at-most-once · at most once

Each message is delivered zero or one times: never duplicated, but it may be lost.

the two-minute refresher

Fire and forget: no acknowledgement, no retry.
Fastest and simplest, least reliable.
Fine where loss is acceptable: metrics samples, some logs.

Where the course teaches it

W00 · Part 6System Design Terminology & Theorylearn it →W02 · Day 4Webhook Delivery Systemrevisit →W03 · Day 1Queue vs Streamrevisit →

Related concepts

At-least-once delivery
Exactly-once processing