Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 279 discussion

Images are first uploaded to S3 bucket. Then, manual audit is performed that lasts 1-24 hours. Only after the audit of the image is finished we can run our Lambda function. If we run event at regular intervals (what does it mean?) should we run it every hour and then we would have bunch of untagged objects that haven't been audited and we would add a tag to them which doesn't make sense. - In option B they explicitly mention that the Wait period will be 24 hours thus insuring that the audit of those objects has been completed. Only then we run the Lambda function.

C. Create an AWS Lambda function to load all untagged S3 objects. Retrieve the results for each item from the REST API and tag each S3 object accordingly. Create and configure an Amazon EventBridge rule to run at regular intervals. Set the Lambda function as a target for the EventBridge rule. This solution leverages AWS Lambda for processing and tagging S3 objects based on the audit results available through the REST API. By using Amazon EventBridge to trigger the Lambda function at regular intervals, the developer ensures that the process runs automatically without manual intervention, efficiently handling the tagging of S3 objects once the audit results are available. This approach minimizes operational effort and does not require the continuous monitoring of S3 object creation or the management of complex workflows.

C is the best anwser. B is wrong, because it induce unnecessary latency, if the image is audited after an hour, the app will still wait for 23 hours to tag the image.

C will take too long... Each img will takd 24 hrs, and it will wait for all imgs. I do not understand why people are confused.. It needs to be triggered when the img is uploaded.

C is the right answer. Lambda+EvenBridge is operationally more efficient than Step Function.

Ans: B . We have to wait for 1- 24 hrs .we cant just run the lambda functions to get untagged objects .

I am confuse because the chatGPT Says C

With option B, what if the external company doesn't complete the audit in 24 hours Least operational over head and long term solution would be going with 1 lambda and event bridge is what I feel.

C coz of operationally efficient words

This solution leverages AWS Lambda, which is a serverless compute service that runs your code in response to events and automatically manages the underlying compute resources for you1. By using Lambda in conjunction with Amazon EventBridge, which can trigger events at regular intervals, you can create a system that periodically checks for new audit results and applies tags to S3 objects without the need for managing server instances or handling queue visibility timeouts. This approach is not only operationally efficient but also cost-effective, as you pay only for the compute time you consume with Lambda21.

B is the correct answer.

I'm still not sure if B is correct. However, I think this use case is very similar to a feature that exists in step functions. Although the wording doesn't answer the question directly and I think waiting 24 hours is the opposite of operationally efficient. The GetTaskToken feature that is part of service integration in step functions would be a perfect match for this scenario, removing the 24 hour wait while maintaining operational efficiency using AWS Step functions. I can only hope this is what they are getting at when I answer this on the exam. https://docs.aws.amazon.com/step-functions/latest/dg/connect-to-resource.html

Best option considering the question conditions. Reading from Rest API

Should be A

I may choose B.

A does not make any sense.