An application processes messages from an Amazon SQS queue. Occasionally, a malformed message causes the processing application to crash, and the message is returned to the queue, creating an infinite loop. How can a solutions architect prevent this?

Answer options:

Increase the visibility timeout of the SQS queue.

Configure a Dead-Letter Queue (DLQ).

Change the queue to a FIFO queue.

Enable long polling on the SQS queue.

How to approach this question

Identify the 'poison pill' message scenario. DLQs are designed to isolate these messages.

Full Answer

B.Configure a Dead-Letter Queue (DLQ).✓ Correct

A Dead-Letter Queue (DLQ) is used to isolate messages that cannot be processed successfully after a maximum number of receives. This prevents 'poison pill' messages from continuously crashing the consumer application.

Common mistakes

Increasing visibility timeout, which only delays the inevitable failure.

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