How do idempotency keys and at-least-once delivery interact in AP systems?

Problem Statement

Explanation

At-least-once means duplicates can occur. Assign a stable idempotency key per user intent or per message. Consumers record processed keys and outcomes so replays or retries are safe. Side effects become repeatable. This keeps availability high while bounding correctness issues under partitions or crashes.

Code Solution

SolutionRead Only

If key seen → return stored result; else process and store outcome

Practice Sets

This question appears in the following practice sets:

CAP Theorem & Consistency Models

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How do idempotency keys and at-least-once delivery interact in AP systems?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

How do idempotency keys and at-least-once delivery interact in AP systems?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which statement best describes the Single Responsibility Principle?

Open–Closed Principle encourages what practice when adding features?

High-Level Design (HLD) typically focuses on which artifacts?

Which UML diagram best captures interactions over time between components?

Which pairing describes a healthy design goal?

More from System Design

Master Interviews
Anywhere, Anytime