The SNS Fan-Out Pattern
~8 min read
Combining SNS's broadcast capability with SQS's durability for reliable multi-consumer event distribution.
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Key points
- •Fan-out = SNS topic with multiple SQS queues as subscribers, not direct Lambda/HTTP subscriptions
- •Each queue gets SQS's own durability/retry/DLQ guarantees independently
- •More resilient than direct subscriptions, which can lose messages if the subscriber is briefly down
- •New consumers can be added later with zero changes to the original publisher