Ravi Sir's Cards › AWS
Role in fan-out
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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Role in fan-out
Amazon SNS
Topic broadcasts one event to many subscribers.
Amazon SQS
Queue buffers work for one consumer group.
Key points
Notify email + inventory together.
Smooth each worker’s backlog.
Example
OrderPlaced → two SQS subscriptions.
Use when
Broadcast.
Buffer + retry.