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Dead letter queue in messaging systems - DLQ or undelivered-message queue
9 points
A dead-letter queue (abbreviation DLQ) is a queue for messages that can't be delivered successfully to their destination.
Dead-letter queue can be later analyzed by developers and processed again.
Without dead-letter queue the failed messages would be gone.
Queueing systems that support dead-letter queue concept:
- Rabbit MQ
- Apache Kafka
- Amazon Simple Queue Service (SQS)
- Amazon EventBridge
- Google Cloud Pub/Sub
- Many others
