Amazon Exam DVA-C02 Topic 5 Question 30 Discussion

Actual exam question for Amazon's DVA-C02 exam

Question #: 30
Topic #: 5

A developer is using AWS Step Functions to automate a workflow The workflow defines each step as an AWS Lambda function task The developer notices that runs of the Step Functions state machine fail in the GetResource task with either an UlegalArgumentException error or a TooManyRequestsException error

The developer wants the state machine to stop running when the state machine encounters an UlegalArgumentException error. The state machine needs to retry the GetResource task one additional time after 10 seconds if the state machine encounters a TooManyRequestsException error. If the second attempt fails, the developer wants the state machine to stop running.

How can the developer implement the Lambda retry functionality without adding unnecessary complexity to the state machine'?

AAdd a Delay task after the GetResource task. Add a catcher to the GetResource task. Configure the catcher with an error type of TooManyRequestsException. Configure the next step to be the Delay task Configure the Delay task to wait for an interval of 10 seconds Configure the next step to be the GetResource task.

BAdd a catcher to the GetResource task Configure the catcher with an error type of TooManyRequestsException. an interval of 10 seconds, and a maximum attempts value of 1. Configure the next step to be the GetResource task.

CAdd a retrier to the GetResource task Configure the retrier with an error type of TooManyRequestsException, an interval of 10 seconds, and a maximum attempts value of 1.

DDuplicate the GetResource task Rename the new GetResource task to TryAgain Add a catcher to the original GetResource task Configure the catcher with an error type of TooManyRequestsException. Configure the next step to be TryAgain.

Show Suggested Answer

Suggested Answer: C

Step Functions Retriers: Retriers provide a built-in way to gracefully handle transient errors within State Machines. Here's how to use them:

Directly attach a retrier to the problematic 'GetResource' task.

Configure the retrier:

ErrorEquals:Set this to ['TooManyRequestsException'] to target the specific error.

IntervalSeconds:Set to 10 for the desired retry delay.

MaxAttempts:Set to 1, as you want only one retry attempt.

Error Handling:

Upon 'TooManyRequestsException', the retrier triggers the task again after 10 seconds.

On a second failure, Step Functions moves to the next state or fails the workflow, as per your design.

'IllegalArgumentException' causes error propagation as intended.

Error Handling in Step Functions:https://docs.aws.amazon.com/step-functions/latest/dg/concepts-error-handling.html

by Albert at Jul 02, 2024, 12:15 AM

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Option B looks like the simplest and most straightforward way to handle the retries. No need to add extra tasks or complexity.

upvoted 0 times

Pok

5 months ago

Yeah, I think adding a catcher to the GetResource task for TooManyRequestsException with a maximum attempts value of 1 is a clean solution.

upvoted 0 times

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Tasia

5 months ago

I agree, option B seems like the best choice here. It keeps it simple and handles the retries efficiently.

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