cloud-engineering

Dead Letter Queue

Definition

A dead letter queue (DLQ) captures messages that cannot be processed successfully after a maximum number of delivery attempts. DLQs prevent message loss and allow engineers to inspect failed messages, diagnose processing errors, and reprocess them once the underlying issue is resolved.

AWS SQS, Azure Service Bus, and RabbitMQ all support DLQ configuration.

Related Terms

SQS

Amazon Simple Queue Service

FIFO Queue

First-In, First-Out Queue

Message Broker

Event Streaming

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