3rd SQS queue - Dead Letter Queue

What is DLQ?

• Handle messages that have not been successfully processed by a consumer

• When a maximum receive count is exceeded, the message will be moved to the DLQ

• DLQ must be of the same type as the source queue (standard or FIFO)

How to use DLQ?

1. Configure it on AWS Console or Terraform

2. Set an monitors/alarms when messages are placed in DLQ

3. Check the messages in DLQ

4. Check exception/errors that cause messages are put in DLQ

Maximum receives

• The number of times that a message can be received before being sent to a dead-letter queue

• When waiting time after consumer's receiving messages exceed visibility timeout, receive_count += 1

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