You have created an AWS CodePipeline which builds and deploys an AWS Step Function. The AWS Step Function is used to implement a state machine to query many records in DynamoDB. Now your lead asks you to add another test stage in the existing pipeline to do testing on the Step Function after a new version is deployed. In the new stage, which of the following options is the easiest to trigger the Step Function for the test?

Answer options:

A.Add a CloudWatch Event rule as the action provider in the new stage. Configure the Step Function as the target of the Event rule.
B.Use a Lambda function to trigger the Step Function to do the testing.
C.Add a Jenkins job to invoke the Step Function to perform any testing needed.
D.Configure an API endpoint in API Gateway that calls StartExecution to start the state machine of the Step Function.

Correct Answer – B
In CodePipeline, a custom stage can be added with an action group. Then the user can configure the action group depending on the needs.
For AWS Step Function, there are several methods to trigger its state machine. For the details, please refer to
https://docs.aws.amazon.com/step-functions/latest/dg/tutorials.html.
Option A is incorrect: Although the CloudWatch Event rule can start a Step Function, it is not a valid action type in the CodePipeline stage.
Option B is CORRECT: Because in the test stage, a Lambda function can be set up to invoke the Step Function:
Option C is incorrect: Because the Jenkins job brings unnecessary complicity. To trigger a Step function, the best way is to use a Lambda function.
Option D is incorrect: Similar to
Option A. API Gateway is not a valid action group in CodePipeline.