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AWS Certified Solutions Architect study material · question 180 of 500

What risk does attaching a dead-letter queue to a FIFO queue introduce?

  1. The exact ordering of operations can be broken
  2. Messages are duplicated on every receive
  3. The source queue stops accepting new messages
  4. Message retention drops to one hour
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Answer: A. The exact ordering of operations can be broken

Moving a failed message aside disturbs strict ordering, which matters when later messages depend on the context of earlier ones.

Source: Using dead-letter queues in Amazon SQS (Amazon Web Services) — Note

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