DOP-C02 practice question 21 of 35

A company is running a custom-built application that processes records. All the components run on Amazon EC2 instances that run in an Auto Scaling…

A company is running a custom-built application that processes records. All the components run on Amazon EC2 instances that run in an Auto Scaling group. Each record's processing is a multistep sequential action that is compute-intensive. Each step is always completed in 5 minutes or less. A limitation of the current system is that if any steps fail, the application has to reprocess the record from the beginning The company wants to update the architecture so that the application must reprocess only the failed steps. What is the MOST operationally efficient solution that meets these requirements?

Answer options

A: Create a web application to write records to Amazon S3 Use S3 Event Notifications to publish to an Amazon Simple Notification Service (Amazon SNS) topic Use an EC2 instance to poll Amazon SNS and start processing Save intermediate results to Amazon S3 to pass on to the next step

B: Perform the processing steps by using logic in the application. Convert the application code to run in a container. Use AWS Fargate to manage the container Instances. Configure the container to invoke itself to pass the state from one step to the next.

C: Create a web application to pass records to an Amazon Kinesis data stream. Decouple the processing by using the Kinesis data stream and AWS Lambda functions.

D: Create a web application to pass records to AWS Step Functions. Decouple the processing into Step Functions tasks and AWS Lambda functions. Correct answer

Correct Answer:

D. Create a web application to pass records to AWS Step Functions. Decouple the processing into Step Functions tasks and AWS Lambda functions.

Explanation

Use AWS Step Functions to Orchestrate Processing: AWS Step Functions allow you to build distributed applications by combining AWS Lambda functions or other AWS services into workflows. Decoupling the processing into Step Functions tasks enables you to retry individual steps without reprocessing the entire record. Architectural Steps: Create a web application to pass records to AWS Step Functions: The web application can be a simple frontend that receives input and triggers the Step Functions workflow. Define a Step Functions state machine: Each step in the state machine represents a processing stage. If a step fails, Step Functions can retry the step based on defined conditions. Use AWS Lambda functions: Lambda functions can be used to handle each processing step. These functions can be stateless and handle specific tasks, reducing the complexity of error handling and reprocessing logic. Operational Efficiency: Using Step Functions and Lambda improves operational efficiency by providing built-in error handling, retries, and state management. This architecture scales automatically and isolates failures to individual steps, ensuring only failed steps are retried.
Reference: AWS Step Functions Building Workflows with Step Functions

Keep practicing

Take the free DOP-C02 practice test

Ten exam-style questions with answers and explanations, plus the exam facts and study guides.

Start the free practice test