AWS - SNS and SQS
You created a FIFO queue but your application receives messages out of order. What is the most likely cause?
You created a FIFO queue but your application receives messages out of order. What is the most likely cause?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Recall FIFO queue ordering rules
FIFO queues require MessageGroupId to maintain order within groups.Step 2: Identify missing MessageGroupId impact
Without MessageGroupId, messages are not grouped and order is not guaranteed.Final Answer:
You did not specify a MessageGroupId when sending messages -> Option BQuick Check:
Missing MessageGroupId breaks FIFO order [OK]
Quick Trick: FIFO needs MessageGroupId to keep order [OK]
Common Mistakes:
- Confusing queue name suffix with ordering
- Assuming visibility timeout affects order
- Mixing standard and FIFO queue types
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