A company is building a serverless application using AWS Step Functions to orchestrate a complex workflow. One of the steps involves calling an external third-party API that is known to be unreliable and frequently times out. The workflow must not fail immediately; it should retry the API call up to 5 times, waiting longer between each attempt. How should the architect implement this?

Answer options:

Write custom retry logic with Thread.sleep() inside the AWS Lambda function that calls the API.

Configure the Retry field in the Step Functions Task state with an IntervalSeconds and a BackoffRate.

Use an Amazon SQS queue with a visibility timeout to delay the retries.

Configure AWS App Mesh to intercept the API call and apply a retry policy.

How to approach this question

Identify the native orchestration feature for retries.

Full Answer

B.Configure the Retry field in the Step Functions Task state with an IntervalSeconds and a BackoffRate.✓ Correct

Configure the Retry field in the Step Functions Task state with an IntervalSeconds and a BackoffRate.

AWS Step Functions allows you to define Retry logic directly in the state machine definition. You can specify the number of MaxAttempts, the initial IntervalSeconds, and a BackoffRate to implement exponential backoff without writing custom code or paying for idle compute.

Common mistakes

Implementing retries inside Lambda, which increases AWS bill due to idle wait time.

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