Idempotency: Making Retries Safe
Idempotency keys, deduplication and the myth of exactly-once. Lesson 8 of Level 9: Microservices.
Level 9 · Microservices · Lesson 8 of 13
Idempotency keys, deduplication and the myth of exactly-once.
Continue learning
- Circuit Breakers & Bulkheads — Previous lesson
- Distributed Transactions: 2PC, Sagas & the Outbox — Next lesson
- Level 9: Microservices — Back to the level
Try it hands-on
- Idempotency Keys & Duplicate Payments — Click “Pay” on a flaky network, retry, and see duplicate charges disappear once idempotency keys are enabled.
- Microservices Lab — Failures, retries, circuit breakers, sagas and idempotency.
All lessons in Microservices
- Why Microservices Exist — and When Not to Use Them
- Finding Service Boundaries & Splitting the Monolith
- Database per Service & Data Ownership
- Synchronous vs Asynchronous Communication
- API Gateways, BFFs & Service Discovery
- Timeouts, Retries & Retry Storms
- Circuit Breakers & Bulkheads
- Idempotency: Making Retries Safe
- Distributed Transactions: 2PC, Sagas & the Outbox
- Observability: Logs, Metrics, Traces & SLOs
- Deployment: Containers, Kubernetes, Canary & Feature Flags
- Testing Microservices & Consumer-Driven Contracts
- Teams, Ownership & Conway’s Law