Dead Letter Queues
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A separate queue where messages that cannot be processed after a configured number of attempts are sent. Prevents poison messages (malformed or unprocessable) from blocking the main queue. Enables manual inspection, alerting, and reprocessing after the underlying issue is fixed.
Key Properties
Related
- Delivery Guarantees (DLQ is part of at-least-once delivery)
- Circuit Breaker (similar failure handling at the service level)