Dead Letter Queues and Retry Strategies
Learn how to handle messages that fail processing using retries with backoff, redelivery limits, and dead letter queues to keep async pipelines reliable.
When Messages Fail
In an async pipeline, a consumer can fail to process a message — a bug, a bad payload, or a downstream outage. Without a plan, that message can block the queue or be lost.
This lesson covers retries and the dead letter queue.
Acknowledgements
A consumer acks a message to confirm successful processing. If it nacks (or never acks), the broker can redeliver it.
Acking before doing the work risks loss; ack only after success.
msg = queue.receive()
process(msg)
msg.ack() # only after successAll lessons in this course
- Introduction to Asynchronous APIs
- Message Queue Fundamentals
- Implementing Background Tasks
- Dead Letter Queues and Retry Strategies