AWS - SNS and SQS
Why does AWS SQS allow duplicate messages in Standard queues but not in FIFO queues?
Why does AWS SQS allow duplicate messages in Standard queues but not in FIFO queues?
hard📝 Conceptual Q10 of 15
Step-by-Step Solution
Solution:
Step 1: Understand Design Trade-offs
Standard queues are designed for high throughput and scalability, allowing duplicates and unordered delivery.Step 2: Contrast with FIFO Queues
FIFO queues guarantee exactly-once processing and ordering by using deduplication and message groups.Final Answer:
Standard queues prioritize high throughput over strict ordering and deduplication -> Option BQuick Check:
Duplicates allowed = Standard queue design choice [OK]
Quick Trick: Standard queues favor speed; FIFO queues ensure order and no duplicates [OK]
Common Mistakes:
- Thinking FIFO queues delete messages immediately
- Assuming Standard queues use MessageGroupId
- Confusing message retention with deduplication
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