intermediate~1.5h
SQS Dead Letter Queues in Depth
A deep look at how SQS dead letter queues work under the hood — maxReceiveCount, redrive policies, inspecting and reprocessing failed messages, and alerting on DLQ depth as a production health signal.
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Subtopics
🎓 Learning objectives
- •Explain how maxReceiveCount and the redrive policy determine when a message moves to a DLQ
- •Configure a redrive policy linking a source queue to its dead letter queue
- •Inspect messages that landed in a DLQ and determine the likely cause
- •Use redrive-to-source to safely reprocess DLQ messages after a fix
- •Set up CloudWatch alarms on DLQ depth as an operational health signal
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Related concepts
sns-subscription-filteringspring-boot-error-handling-and-resilience-on-awssqs-fundamentalscloudwatch-logs-and-metrics