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After subscribing an SQS queue to an SNS topic, messages are duplicated in the queue. What is a likely misconfiguration?

medium📝 Debug Q7 of 15
AWS - SNS and SQS
After subscribing an SQS queue to an SNS topic, messages are duplicated in the queue. What is a likely misconfiguration?
AThe queue is subscribed multiple times to the same SNS topic.
BSNS topics always duplicate messages by design.
CSQS queues cannot receive messages from SNS.
DThe message size exceeds SNS limits.
Step-by-Step Solution
Solution:

  1. Step 1: Identify cause of duplicates

    Multiple subscriptions of the same queue cause duplicate messages.

  2. Step 2: Confirm SNS behavior

    SNS does not duplicate messages unless configured with multiple subscriptions.

  3. Final Answer:

    The queue is subscribed multiple times to the same SNS topic. -> Option A

  4. Quick Check:

    Multiple subscriptions cause duplicates [OK]
Quick Trick: Avoid multiple subscriptions of same queue to SNS [OK]
Common Mistakes:
MISTAKES
  • Assuming SNS duplicates messages by default
  • Thinking SQS cannot receive SNS messages
  • Blaming message size for duplication

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