Ravi Sir's Cards › AWS
Why not invoke two Lambdas from the API?
What is a VPC: your own private network inside one AWS Region, example ThreeTierVpc 10.0.0.0/16.
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What this card says
What it is
The client waits on both; one failure can fail the whole request; scaling couples the workers.
Why it matters
SNS+SQS decouples producers from consumers and isolates failures per queue.
How / example
API Publish once to SNS; email-q and inventory-q each trigger their Lambda.