AWS Certified Developer – Associate (DVA-C02) — Question 42

A developer is using an AWS Lambda function to generate avatars for profile pictures that are uploaded to an Amazon S3 bucket. The Lambda function is automatically invoked for profile pictures that are saved under the /original/ S3 prefix. The developer notices that some pictures cause the Lambda function to time out. The developer wants to implement a fallback mechanism by using another Lambda function that resizes the profile picture.
Which solution will meet these requirements with the LEAST development effort?

Answer options

• A. Set the image resize Lambda function as a destination of the avatar generator Lambda function for the events that fail processing.
• B. Create an Amazon Simple Queue Service (Amazon SQS) queue. Set the SQS queue as a destination with an on failure condition for the avatar generator Lambda function. Configure the image resize Lambda function to poll from the SQS queue.
• C. Create an AWS Step Functions state machine that invokes the avatar generator Lambda function and uses the image resize Lambda function as a fallback. Create an Amazon EventBridge rule that matches events from the S3 bucket to invoke the state machine.
• D. Create an Amazon Simple Notification Service (Amazon SNS) topic. Set the SNS topic as a destination with an on failure condition for the avatar generator Lambda function. Subscribe the image resize Lambda function to the SNS topic.

Correct answer: A

Explanation

Option A is correct because it allows for a straightforward integration by directly configuring the image resize Lambda function to handle failures from the avatar generator, minimizing development work. The other options, while functional, introduce additional components like SQS, Step Functions, or SNS, which require more setup and management, increasing complexity and development effort.