Learn how to use AWS Step Functions to efficiently process order returns by running independent audit checks in parallel before authorizing the return.
Table of Contents
Question
An application that processes order returns must run two independent audit checks. When both checks are successfully completed, the return authorization step is run.
Which AWS Step Functions state could a developer use to implement this logic?
A. Wait
B. Choice
C. Task
D. Parallel
Answer
D. Parallel
Explanation
A developer can use a Parallel state to branch code into two independent tasks that must both complete before the next step begins.
To implement the logic for an application that processes order returns and requires two independent audit checks to be successfully completed before running the return authorization step, the most suitable AWS Step Functions state is:
D. Parallel
The Parallel state in AWS Step Functions allows developers to create multiple branches of execution that run concurrently. Each branch can contain one or more states, and these branches are executed independently of each other. Once all the branches have completed execution, the Parallel state progresses to the next state in the workflow.
In the given scenario, the two independent audit checks can be implemented as separate branches within a Parallel state. Each branch would contain a Task state representing an audit check. The Parallel state ensures that both audit checks are executed concurrently, optimizing the processing time.
After the Parallel state, a Choice state can be used to evaluate the results of the audit checks. If both checks are successfully completed, the workflow can proceed to the return authorization step, which can be implemented as another Task state.
Here’s a brief explanation of why the other options are not suitable:
A. Wait: The Wait state is used to delay the execution of the workflow for a specified duration. It does not allow for parallel execution of multiple branches.
B. Choice: The Choice state is used to make decisions based on the input data and transition to different states accordingly. It does not support parallel execution of multiple branches.
C. Task: The Task state is used to perform a single unit of work, such as invoking an AWS Lambda function or an activity worker. While tasks can be used to represent the audit checks, the Task state alone does not provide the capability to run them in parallel.
By using the Parallel state in AWS Step Functions, developers can efficiently implement the required logic for processing order returns, ensuring that the two independent audit checks are executed concurrently before proceeding with the return authorization step.
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