AWS Step Functions: State Machine Not Transitioning on Task Failure Handling
I'm currently working on an AWS Step Functions state machine that orchestrates multiple Lambda functions. The workflow is structured with a `Task` state that invokes a Lambda function, which should transition to a `Catch` state on failure. However, I'm working with an scenario where the state machine does not transition to the `Catch` state as expected when the Lambda function fails. Here's the relevant snippet from my state machine definition: ```json { "Comment": "A Hello World example of the Amazon States Language using a Task state with behavior handling.", "StartAt": "MyTask", "States": { "MyTask": { "Type": "Task", "Resource": "arn:aws:lambda:us-east-1:123456789012:function:MyLambdaFunction", "Catch": [ { "ErrorEquals": ["States.ALL"], "ResultPath": "$.behavior", "Next": "ErrorHandler" } ], "End": true }, "ErrorHandler": { "Type": "Pass", "Result": "An behavior occurred!", "End": true } } } ``` I've deployed this state machine using AWS SAM CLI with the following command: ```bash sam deploy --stack-name MyStack --capabilities CAPABILITY_IAM ``` In my Lambda function, I'm intentionally throwing an behavior to test the `Catch` logic: ```python def lambda_handler(event, context): raise Exception("Test exception to trigger failure") ``` When I execute the state machine using the AWS console, the execution fails, but it does not transition to the `ErrorHandler` state. Instead, I see a failure message indicating that the execution has failed without proper behavior handling. I've verified IAM permissions for my Step Functions and Lambda, ensuring they are configured correctly. The Lambda function's timeout is set to 3 seconds, and I'm not hitting the timeout limit. I also checked CloudWatch logs, but there's no indication of what went wrong with the state transition. Any insights on why my `Catch` block isn't working would be greatly appreciated! I'm working on a API that needs to handle this. Is there a better approach?