Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 376 discussion

Considering the requirements, Option B (Amazon EventBridge with AWS Lambda and S3 Lifecycle Expiration Policy) seems to be the most cost-effective and appropriate solution. It combines the scalability and flexibility of AWS Lambda for image processing with the straightforward event handling of Amazon EventBridge, and appropriately manages the image lifecycle with an S3 expiration policy. While Option C is also a strong contender, the misalignment of the lifecycle policy with the requirement makes Option B a better fit. Option A might be more suitable for complex workflows but is likely not needed for this scenario, and Option D includes unnecessary long-term archival steps.

B is for sure A no because Step Function is not in list of s3 event destinations https://docs.aws.amazon.com/AmazonS3/latest/userguide/notification-how-to-event-types-and-destinations.html C and D has option for storing data longer than 6 months which is not required

Difficult one. Both options B and D meet the specific requirement of storing the files in an Amazon S3 bucket for up to 6 months. However, when considering the additional requirements of being reliable at enterprise scale, having the ability to rerun processing jobs in the event of failure, and being the most cost-effective solution, option D with Amazon SQS, AWS Lambda, and the S3 Lifecycle policy to transition to Glacier Deep Archive is still the better choice. No Rerun of jobs with B. Only D

"Store the images in S3 for six months" - leaves only option B. Options C & D mean keeping the images in S3 forever and that's not the more cost effective option compared to just deleting the files as the question implies is a requirement.

You’ve got to have a buffer for reruns! For those concerned about the 6 months TTL in S3 remember glacier isn’t S3.

C and D are out, for keeping data more than 6 months. A is out, due to S3 event destination does not include step function, which is anyway seldom use for one step action. Eventbridge does support retry if event fail to go off:

SQS ensured that any failed jobs can be retried.

"ability to rerun processing jobs in the event of failure"

Let’s break down the question into some decisive pieces: 1.Millions of customers will use solution  this to me has to be a robust queuing solution (like SQS, not eventbridge, not step-function) 2.Store the files in an Amazon S3 bucket for up to 6 months This doesn’t talk about deleting the files. It says store in “an” S3 bucket for 6-months, which means it can definitely go to another “MOST cost-effective” bucket, i.e. Glacier Deep Archive 3.Solution must handle significant variance in demand  “significant” variance can be interpreted as infrequent usage. 4.Solution must also be reliable /ability to rerun processing in the event of failure – Only SQS can achieve this. My verdict: Answer = D

1. The solution must also be reliable at enterprise scale and have the ability to rerun processing jobs in the event of failure. Use SQS , option A / B / C are not include AWS SQS. 2. The cost-effective solution , option D contains S3 Glacier Deep Archive to reduce S3 storage costs

I go for B but this question is completely wrong. First of all, if you modify in the same bucket you are going to have pontential infinite loop... which means 3 answers are out. But why would you save things in glacier when they can be deleted? About ReRun, in EventBridge you can replay...

Everybody is focused on choosing the MOST cost-effective option, but there's also this requirement: "The solution must also be reliable at enterprise scale and have the ability to rerun processing jobs in the event of failure." which I believe it can be achieved only by option D

I think this question is warding wrong. If we look at the requirement "store the files in an Amazon S3 bucket for up to 6 months." and decide that objects can be deleted after 6 months, C and D are excluded. But is that true? Would AWS create a problem involving such an elementary mistake?

A is the answer

Vote D because the requirement "rerun processing jobs in the event of failure." Glacier Deep archive is also really cost-effective

Option D is right answer as it gets the batch files with significant variance in demand

Going for A as it's the only option that achieve reprocessing, B could be a good answer but it doesn´t allow any reporcessing.