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Question 182 - DOP-C01 discussion

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You work for a company that automatically tags photographs using artificial neural networks (ANNs), which run on GPUs using C++. You receive millions of images at a time, but only 3 times per day on average. These images are loaded into an AWS S3 bucket you control for you in a batch, and then the customer publishes a JSON-formatted manifest into another S3 bucket you control as well. Each image takes 10 milliseconds to process using a full GPU. Your neural network software requires 5 minutes to bootstrap. Image tags are JSON objects, and you must publish them to an S3 bucket. Which of these is the best system architectures for this system?

A.
Create an OpsWorks Stack with two Layers. The first contains lifecycle scripts for launching and bootstrapping an HTTPAPI on G2 instances for ANN image processing, and the second has an alwayson instance which monitors the S3 manifestbucket for new files. When a new file is detected, request instances to boot on the ANN layer. When the instances arebooted and the HTTP APIs are up, submit processing requests to individual instances.
Answers
A.
Create an OpsWorks Stack with two Layers. The first contains lifecycle scripts for launching and bootstrapping an HTTPAPI on G2 instances for ANN image processing, and the second has an alwayson instance which monitors the S3 manifestbucket for new files. When a new file is detected, request instances to boot on the ANN layer. When the instances arebooted and the HTTP APIs are up, submit processing requests to individual instances.
B.
Make an S3 notification configuration which publishes to AWS Lambda on the manifest bucket. Make the Lambda create a CloudFormation Stack which contains the logic to construct an autoscaling worker tier of EC2 G2 instances with the ANN code on each instance. Create an SQS queue of the images in the manifest. Tear the stack down when the queue is empty.
Answers
B.
Make an S3 notification configuration which publishes to AWS Lambda on the manifest bucket. Make the Lambda create a CloudFormation Stack which contains the logic to construct an autoscaling worker tier of EC2 G2 instances with the ANN code on each instance. Create an SQS queue of the images in the manifest. Tear the stack down when the queue is empty.
C.
Deploy your ANN code to AWS Lambda as a bundled binary for the C++ extension. Make an S3 notification configuration on the manifest, which publishes to another AWS Lambda running controller code. This controller code publishes all the images in the manifest to AWS Kinesis. Your ANN code Lambda Function uses the Kinesis as an Event Source. The system automatically scales when the stream contains image events.
Answers
C.
Deploy your ANN code to AWS Lambda as a bundled binary for the C++ extension. Make an S3 notification configuration on the manifest, which publishes to another AWS Lambda running controller code. This controller code publishes all the images in the manifest to AWS Kinesis. Your ANN code Lambda Function uses the Kinesis as an Event Source. The system automatically scales when the stream contains image events.
D.
Create an Auto Scaling, Load Balanced Elastic Beanstalk worker tier Application and Environment. Deploy the ANN code to G2 instances in this tier. Set the desired capacity to 1. Make the code periodically check S3 for new manifests. When a new manifest is detected, push all of the images in the manifest into the SQS queue associated with the Elastic Beanstalk worker tier.
Answers
D.
Create an Auto Scaling, Load Balanced Elastic Beanstalk worker tier Application and Environment. Deploy the ANN code to G2 instances in this tier. Set the desired capacity to 1. Make the code periodically check S3 for new manifests. When a new manifest is detected, push all of the images in the manifest into the SQS queue associated with the Elastic Beanstalk worker tier.
Suggested answer: B

Explanation:

The Elastic Beanstalk option is incorrect because it requires a constantly-polling instance, which may break and costs money. The Lambda fleet option is incorrect because AWS Lambda does not support GPU usage. The OpsWorks stack option both requires a constantly-polling instance, and also requires complex timing and capacity planning logic. The CloudFormation option requires no polling, has no always-on instances, and allows arbitrarily fast processing by simply setting the instance count as high as needed.

Reference: http://docs.aws.amazon.com/lambda/latest/dg/current-supported-versions.html

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asked 16/09/2024
FUKUMOTO AYUMI
31 questions
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