Q44 — AWS DVA-C02 Ch.2

Question 44 of 100 | ← Chapter 2

A developer is optimizing an AWS Lambda function and wants to test these changes on a subset of production traffic. The Lambda function serves requests for a REST API in Amazon API Gateway. The developer needs to deploy their changes for testing in production without changing the API Gateway URL. Which solution meets these requirements?

• A. Define a function version for the currently deployed production Lambda function. Update the API Gateway endpoint to reference the new Lambda function version. Upload and publish the optimized Lambda function code. In the production API Gateway stage, define a canary release and configure traffic percentage to route to the canary. Update the API Gateway endpoint to use the Lambda function’s $LATEST version. Deploy the API to the canary stage.
• B. Define a function version for the currently deployed production Lambda function. Update the API Gateway endpoint to reference the new Lambda function version. Upload and publish the optimized Lambda function code. Update the API Gateway endpoint to use the Lambda function’s $LATEST version. Deploy a new API Gateway stage.
• C. Define an alias on the Lambda function’s $LATEST version. Update the API Gateway endpoint to reference the new Lambda function alias. Upload and publish the optimized Lambda function code. In the production API Gateway stage, define a canary release and configure traffic percentage to route to the canary. Update the API Gateway endpoint to use the Lambda function’s $LATEST version. Deploy to the canary stage. ✓
• D. Define a function version for the currently deployed production Lambda function. Update the API Gateway endpoint to reference the new Lambda function version. Upload and publish the optimized Lambda function code. Update the API Gateway endpoint to use the Lambda function’s $LATEST version. Deploy the API to the production API Gateway stage.

Correct Answer: C. Define an alias on the Lambda function’s $LATEST version. Update the API Gateway endpoint to reference the new Lambda function alias. Upload and publish the optimized Lambda function code. In the production API Gateway stage, define a canary release and configure traffic percentage to route to the canary. Update the API Gateway endpoint to use the Lambda function’s $LATEST version. Deploy to the canary stage.

Explanation

Option C describes defining an alias on the Lambda function’s $LATEST version, ensuring seamless replacement of the $LATEST version with the new optimized version. Then, configuring a canary release in API Gateway routes a portion of traffic to the new version, enabling production testing without impacting all traffic. Option A incorrectly updates the API Gateway endpoint to reference a version instead of an alias. Option B also deploys directly to a new version rather than using an alias. Option D deploys directly to production without any canary mechanism. Therefore, option C best satisfies the requirements. 【Lantern Certification provided by: swufelp1999】