AWS - SNS and SQS
You want an SNS topic to send SMS notifications and also invoke a Lambda function whenever a message is published. How should you set up the subscriptions?
You want an SNS topic to send SMS notifications and also invoke a Lambda function whenever a message is published. How should you set up the subscriptions?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand SNS subscription model
SNS topics can have multiple subscriptions with different protocols simultaneously.Step 2: Configure separate subscriptions
To send SMS and invoke Lambda, create two subscriptions: one with 'sms' protocol and phone number endpoint, another with 'lambda' protocol and Lambda ARN.Step 3: Evaluate other options
Create a single subscription with protocol 'lambda' that sends SMS messages via the Lambda function is incorrect because SNS does not send SMS via Lambda automatically; Create two subscriptions with protocol 'email' and forward emails to SMS and Lambda is invalid as email cannot forward to SMS or Lambda directly; Create one subscription with protocol 'sms' and configure the Lambda function to poll the SMS messages is incorrect because Lambda does not poll SMS messages.Final Answer:
Option A -> Option AQuick Check:
Multiple subscriptions with different protocols [OK]
Quick Trick: Use separate SNS subscriptions for SMS and Lambda [OK]
Common Mistakes:
- Trying to send SMS via Lambda subscription alone
- Using email protocol to forward to SMS or Lambda
- Assuming Lambda polls SMS messages
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