Message Acknowledgements & Durability
Ensure message reliability by implementing manual acknowledgements and making messages and queues durable. Prevent data loss in case of consumer or broker failures.
Introduction to Reliability
In distributed systems, ensuring messages are processed reliably is paramount. What happens if a server crashes? Or if a message consumer fails mid-processing?
This lesson explores two key mechanisms in RabbitMQ to prevent data loss and ensure reliability: Message Acknowledgements and Durability for both messages and queues.
What are Message Acknowledgements?
When a consumer receives a message, it needs to tell RabbitMQ that it has successfully processed it. This confirmation is called an Acknowledgement (or 'ack').
- Without Acks: If a consumer crashes before processing, the message is lost.
- With Acks: If a consumer crashes, RabbitMQ knows the message wasn't acknowledged and can redeliver it to another consumer.
All lessons in this course
- Hello World: Simple Queue
- Work Queues: Fair Dispatch
- Message Acknowledgements & Durability
- Publish/Subscribe with Fanout Exchanges