AWS - SNS and SQS
You want to build a system that sends messages to an AWS SQS queue and ensures each message is processed exactly once by a receiver. Which combination of features should you use?
You want to build a system that sends messages to an AWS SQS queue and ensures each message is processed exactly once by a receiver. Which combination of features should you use?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Understand message processing guarantees
Standard queues can deliver messages more than once; FIFO queues preserve order and support exactly-once processing with deduplication.Step 2: Ensure messages are deleted after processing
Deleting messages after processing prevents reprocessing the same message.Step 3: Combine features for exactly-once processing
Use FIFO queue with deduplication and delete messages after processing to guarantee exactly-once delivery.Final Answer:
FIFO queue with deduplication and message deletion after processing -> Option CQuick Check:
Exactly-once = FIFO + deduplication + delete [OK]
Quick Trick: Use FIFO queue with deduplication and delete messages after processing [OK]
Common Mistakes:
MISTAKES- Using standard queue for exactly-once needs
- Not deleting messages after processing
- Ignoring deduplication feature
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