AWS - SNS and SQS
Given a FIFO queue with MessageGroupId 'group1', if three messages M1, M2, M3 are sent in order, what is the order of message delivery?
Given a FIFO queue with MessageGroupId 'group1', if three messages M1, M2, M3 are sent in order, what is the order of message delivery?
medium📝 service behavior Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand FIFO queue ordering with MessageGroupId
Messages with the same MessageGroupId are delivered in the exact order sent.Step 2: Apply ordering to messages M1, M2, M3
Since all share 'group1', delivery order is M1, then M2, then M3.Final Answer:
Messages delivered in exact sent order: M1, M2, M3 -> Option DQuick Check:
FIFO with same group ID preserves order = M1, M2, M3 in exact order [OK]
Quick Trick: FIFO queues preserve order per MessageGroupId [OK]
Common Mistakes:
- Assuming messages can arrive out of order in FIFO
- Confusing standard queue behavior with FIFO
- Thinking messages are discarded if order is broken
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