Exam AWS Certified Solutions Architect - Professional SAP-C02 topic 1 question 68 discussion

The correct answer is A, migrating the data processing script to an AWS Lambda function and using an S3 event notification to invoke the Lambda function to process the objects when the company uploads the objects. This solution meets the company's requirements of high availability and scalability, as well as reducing long-term management overhead, and is likely to be the most cost-effective option. Option B involves creating an SQS queue and configuring S3 to send event notifications to it. The data processing script would then poll the SQS queue and process the S3 objects that the SQS message identifies. While this option also provides high availability and scalability, it is less cost-effective than using Lambda, as it requires additional resources such as an SQS queue and an EC2 Auto Scaling group.

A is correct, it provide HA, scale, less management. Task only need 5 minutes B: enen more complex C: container still run on one EC2, not scale d: need container, Farget and Lambda. Complex than A

AWS Lambda with S3 event notification is the most cost-effective, highly available, and scalable option for short-lived, event-driven tasks like file processing. It eliminates EC2 idle time, reduces operational overhead, and fits within Lambda’s time and memory limits. This architecture minimizes cost while maximizing simplicity and resilience.

I ran the numbers in the cost calculator and it turns out D is 10 times more expensive than A...

Given the discussion here, I used the cost calculator to estimate the cost of A and D. D is indeed much more costly than A D: 44 USD A: 3 USD

The Lambda solution (Option A) provides the most efficient, cost-effective, and manageable solution while meeting all requirements for high availability and scalability with minimal operational overhead.

+----------------------+ | Amazon S3 | | (Stores Uploaded Files)| +----------------------+ | | (S3 Event Notification) v +----------------------+ | AWS Lambda | | (Processes Files) | +----------------------+ | | (Processed Data) v +----------------------+ | Amazon S3 | | (Stores Processed Data)| +----------------------+

Option with Lambda would be more reasonable because the rational behind the cost on the solution would be triggering lambda on the S3 event. The current behaviour is 40% of EC2 being not utilised so that Option D to run in ECS with Fargate would be costlier than Lambda option here

A. Migrate the data processing script to an AWS Lambda function. Use an S3 event notification to invoke the Lambda function to process the objects when the company uploads the objects.

instead of scheduled 10 min with multiple files processing (each takes 5 minutes) it will be event driven with lambda each time a file is uploaded --> Answer A

A, the company wants to reduce management overhead not costs, we should stay with the question requirement, it doesn't said anything about cost, probably D will be cheaper but the solution must resolve the question necessity and is reduce long-term management overhead

I vote D because the service is from EC2 to lambda and work is processing data. Without given how big is the data we can't assume that the data is always below the lambda ephemeral storage limit 0.5GB. Nowadays, a file can easily break 0.5GB. While D is still EC2 based so whatever previous EC2 can do farget can do as well.

The answer is A: AWS Pricing Calculator (using: 10,000 request per month, 300,000 ms which = 5 minutes 128 MB of Memory 512 MB of Storage ) Amount of memory allocated: 128 MB x 0.0009765625 GB in a MB = 0.125 GB Amount of ephemeral storage allocated: 512 MB x 0.0009765625 GB in a MB = 0.5 GB Pricing calculations 10,000 requests x 300,000 ms x 0.001 ms to sec conversion factor = 3,000,000.00 total compute (seconds) 0.125 GB x 3,000,000.00 seconds = 375,000.00 total compute (GB-s) 375,000.00 GB-s x 0.0000166667 USD = 6.25 USD (monthly compute charges) 10,000 requests x 0.0000002 USD = 0.00 USD (monthly request charges) 0.50 GB - 0.5 GB (no additional charge) = 0.00 GB billable ephemeral storage per function Lambda costs - Without Free Tier (monthly): 6.25 USD For those thinking D is the cheaper option, do you really believe ECS Fargate would be cheaper?

Ok i was thinking between A and D. I'm pretty sure which is D our answer, see the details. The requirements are: - COST as much as possible low - OPERATIONS as much as possible managed. So at the first reading, the A option seems to be the correct option (because it's totally AWS managed), but here we're totally forgot the cost. Running a Lambda function, for 5 minutes every 10 minutes, it's very very more expensive than a simple ECS task running continously. Finally, ECS in fargate mode is totally AWS managed, so we will have lower cost, and a serverless and HA environment, which auto-scale if we need more processing at time. For me, option D is the correct answer.

A, use lambda function is much cost-effective than use ECS Margate

Option A is the most cost-effective and efficient solution. AWS Lambda allows for running code in response to triggers such as S3 event notifications without the need to manage servers, thereby directly addressing the requirement to reduce long-term management overhead. Since the script is only needed when new files are uploaded and takes about 5 minutes to process each file, Lambda’s ability to scale automatically and its billing model based on actual compute time used make it an ideal solution. Lambda can process files immediately upon upload, maximizing efficiency and minimizing idle time. Option D proposes using Amazon ECS on AWS Fargate with Lambda to trigger tasks. This solution introduces container orchestration, which can improve scalability and reduce some management overhead. However, it is not as cost-effective as directly invoking a Lambda function to process files, considering the lightweight nature of the task and the added complexity of managing container orchestration and Lambda functions together.

100% the answer is D. 5 minutes to process EACH FILE? And the EC2 instance is processing files 60% of the time? Lambda would be crazy expensive in this scenario. ECS/Fargate = cheaper for sure. See link in @covabix879 comment for proof of this. Greyeye said something rather ridiculous: "If you get 1000 images, you will see 1000 tasks. That is not economical or cheap." How can 1x EC2 instance running a script every 10 minutes process 1000 images with each one taking 5 minutes? Even if the script processed images in parallel, e.g. one image per vCPU at a time, that instance would need 500 vCPUs! For the EC2 instance to be idle 40% of the time, it would need 833 vCPUs. That's ridiculous. But even if 1000 images suddenly appeared, the Lambda solution would still result in 1000 Lambdas all firing and running for 5 minutes each. Which is going to be more expensive than ECS/Fargate.