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Exam AWS Certified Developer - Associate DVA-C02 topic 1 question 251 discussion

Exam question from Amazon's AWS Certified Developer - Associate DVA-C02
Question #: 251
Topic #: 1
[All AWS Certified Developer - Associate DVA-C02 Questions]

A developer has created a data collection application that uses Amazon API Gateway, AWS Lambda, and Amazon S3. The application’s users periodically upload data files and wait for the validation status to be reflected on a processing dashboard. The validation process is complex and time-consuming for large files.

Some users are uploading dozens of large files and have to wait and refresh the processing dashboard to see if the files have been validated. The developer must refactor the application to immediately update the validation result on the user’s dashboard without reloading the full dashboard.

What is the MOST operationally efficient solution that meets these requirements?

  • A. Integrate the client with an API Gateway WebSocket API. Save the user-uploaded files with the WebSocket connection ID. Push the validation status to the connection ID when the processing is complete to initiate an update of the user interface.
  • B. Launch an Amazon EC2 micro instance, and set up a WebSocket server. Send the user-uploaded file and user detail to the EC2 instance after the user uploads the file. Use the WebSocket server to send updates to the user interface when the uploaded file is processed.
  • C. Save the user’s email address along with the user-uploaded file. When the validation process is complete, send an email notification through Amazon Simple Notification Service (Amazon SNS) to the user who uploaded the file.
  • D. Save the user-uploaded file and user detail to Amazon DynamoDB. Use Amazon DynamoDB Streams with Amazon Simple Notification Service (Amazon SNS) push notifications to send updates to the browser to update the user interface.
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Suggested Answer: A 🗳️
by Claire_KMT at Oct. 29, 2023, 2:05 a.m.
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PrakashM14
Highly Voted 1 year ago
Selected Answer: A
Option B involves setting up a WebSocket server on an EC2 instance, which is more manual and may require additional management overhead. Option C relies on email notifications, which might introduce delays and may not provide the desired real-time updates. Option D involves DynamoDB and SNS, which may add complexity without the direct support for real-time updates that WebSocket provides. So, Option A
upvoted 8 times
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65703c1
Most Recent 5 months, 1 week ago
Selected Answer: A
A is the correct answer.
upvoted 1 times
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KarBiswa
8 months ago
Selected Answer: A
https://docs.aws.amazon.com/apigateway/latest/developerguide/apigateway-websocket-api.html The use case says the option
upvoted 1 times
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SerialiDr
9 months, 1 week ago
Selected Answer: A
This approach leverages the real-time capabilities of WebSocket connections managed by Amazon API Gateway. When a user uploads a file, the application can associate the file with the user's WebSocket connection ID. Once the file validation process completes, the application can send the status directly to the connected client, allowing immediate updates to the dashboard without the need for manual refreshes.
upvoted 3 times
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tqiu654
10 months, 3 weeks ago
Selected Answer: D
Based on ChatGPT: D.
upvoted 1 times
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ansobimat
11 months, 2 weeks ago
Selected Answer: A
A. Integrate the client with an API Gateway WebSocket API. Save the user-uploaded files with the WebSocket connection ID. Push the validation status to the connection ID when the processing is complete to initiate an update of the user interface.
upvoted 3 times
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tapan666
1 year ago
Selected Answer: D
Option C could work for notifying users, it doesn't provide immediate updates on the user's dashboard. Users would need to check their email to see the validation status, which may not be as user-friendly as real-time updates on the dashboard. It adds complexity with email notifications and may result in longer delays before users see the validation results. Option D (using DynamoDB Streams and Amazon SNS) is preferred because it offers a more operationally efficient and real-time solution without the need for WebSocket management, email notifications, or a constantly running EC2 instance. It provides immediate updates on the user's dashboard while keeping operational complexity and costs to a minimum.
upvoted 2 times
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Claire_KMT
1 year ago
B. Launch an Amazon EC2 micro instance, and set up a WebSocket server. Send the user-uploaded file and user detail to the EC2 instance after the user uploads the file. Use the WebSocket server to send updates to the user interface when the uploaded file is processed. OR D. Save the user-uploaded file and user detail to Amazon DynamoDB. Use Amazon DynamoDB Streams with Amazon Simple Notification Service (Amazon SNS) push notifications to send updates to the browser to update the user interface.
upvoted 1 times
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