Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 266 discussion

The requirement here is to catch and deal with the corruption at the time of ingestion. Hence, the logical place to put the check would be where the ingestion is actually happening, which is when the image is put into the S3 bucket. Amazon S3 can be configured to send an event notification when a new object is created (i.e., put into the bucket). This event can then trigger a Lambda function that uses the Python logic to check the image for corruption. This way, you are catching and dealing with any issues as soon as the image is ingested.

If you are tempted to go with D - remember that S3 event notificaitons can ONLY be sent to : SQS, Lambda, SNS Topic, Event Bridge. You cannot DIRECTLY invoke a Step function as part of the S3 notification. You can use Event bridge to do that. But that is not mentioned here.

Option B would add unnecessary latency by running the detection logic every time an image is fetched from the origin

By using a Lambda@Edge function triggered by an origin-response event, you can inspect and process the images as soon as they are retrieved from the S3 bucket, before they are cached and served to the end-users. This allows you to detect and handle corrupted images with minimal latency, ensuring a better user experience in the web application. Option C (S3 event notification invoking a Lambda function) would introduce additional latency, as the Lambda function would run after the image has been ingested into the S3 bucket, and the detection logic would not be integrated with the serving process.

https://docs.aws.amazon.com/lambda/latest/dg/with-s3.html Using AWS Lambda with Amazon S3 PDF RSS You can use Lambda to process event notifications from Amazon Simple Storage Service. Amazon S3 can send an event to a Lambda function when an object is created or deleted. You configure notification settings on a bucket, and grant Amazon S3 permission to invoke a function on the function's resource-based permissions policy.

Lambda@Edge triggered by origin-response event: Pros: Detects corrupted images closer to the origin, minimizing impact. Avoids processing overhead for valid images. Cons: Corrupted images might still be partially downloaded by users before detection.

Option C

its a C

Take care of corrupted images as soon as they get uploaded to S3

D is for more complex and multiple sets of Lambda.

A&B is too late, D is unnecessary C is correct

C is correct.

Correct Answer is C