Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 110 discussion

To meet the requirements of reducing coupling within the application and improving website performance, the solutions architect should consider taking the following actions: C. Configure the application to upload images directly from each user's browser to Amazon S3 through the use of a pre-signed URL. This will allow the application to upload images directly to S3 without having to go through the web server, which can reduce the load on the web server and improve performance. D. Configure S3 Event Notifications to invoke an AWS Lambda function when an image is uploaded. Use the function to resize the image. This will allow the application to resize images asynchronously, rather than having to do it synchronously during the upload request, which can improve performance.

Why would anyone vote C? signed URL is for temporary access. also, look at the vote here: https://www.examtopics.com/discussions/amazon/view/82971-exam-aws-certified-solutions-architect-associate-saa-c02/

Option C removes the server from the equation, it reduces latency. Once the image sits on s3, use lambda to resize

see https://aws.amazon.com/blogs/compute/uploading-large-objects-to-amazon-s3-using-multipart-upload-and-transfer-acceleration/ B separate concerns and has the best performance

BD looks accurate. Presigned URLs provide short time access to users to upload or download objects to/from S3. This approach is not feasible to renew URL every time and give it to every random users who plans to access website. Presigned URL generally used for occasional sharing of private files.

CD is the more appropriate solution bec. when the user uploads the images, it will directly uploaded to the S3 while if BD, when the user uploads the images, it will first go to the web server then to the S3 bucket and This can cause a slow upload process since the web server is processing the download from the user, then upload to the s3 bucket.

While C can reduce web server load, it doesn't address image resizing, which is a critical requirement. So B & D would be the answers.

It's very clear C D

C, D for sure

Ans B, D - 1st: Upload the original images to Amazon S3 2nd: Configure S3 Event Notifications to invoke an AWS Lambda function when an image is uploaded to resize the image.

I am voting for C and D. B and D could also work, but when you upload the images to the EC2 and then to S3 it could cause additional performance and network traffic load.

I don't understand why the expiration time of presigned urls is being questioned. You can certainly design an upload flow that uses the SDK to create a new presigned url before uploading.

B and D is the way to go

CD - No point having the instance do extra work when we can use pre signed URLs and let the user directly upload to S3, hence B is not an operationally efficient option. Furthermore B results in more traffic through the instance which is inefficient.

C is not a valid option to upload the image is to have presigned url to retrieve the file/image from S3

BD is more reasonable than CD

BD is the answer, idk why anyone would choose c ?? pre-signed urls are for security pursoses