Learn how AWS Step Functions enables coordination of multi-step serverless application workflows using Lambda functions. Ideal for apps with complex, dependent processes.
Table of Contents
Question
Which scenario suggests the need for a task coordination service such as AWS Step Functions?
A. A reporting application must update its calculation logic to provide more analytical data to business users.
B. A monolithic application that is written in Java is updating its technology stack.
C. A serverless application must run a series of AWS Lambda functions that are dependent on each other.
D. A website that serves static content is expanding its reach to a global audience.
Answer
C. A serverless application must run a series of AWS Lambda functions that are dependent on each other.
Explanation
This applicaition is a good candidate for using a coordination service to handle errors and timeouts. In this way, the functions themselves can focus on business logic.
AWS Step Functions is a serverless workflow orchestration service that allows you to coordinate multiple AWS Lambda functions and other AWS services into flexible workflows. It is ideal for building serverless applications that have multiple steps or tasks that need to be executed in a specific order, with some tasks dependent on the successful completion of previous tasks.
In the given scenario, the serverless application needs to run a series of Lambda functions that depend on each other. This is a textbook use case for Step Functions. With Step Functions, you can define the workflow as a series of steps, specifying which Lambda function to run at each step and defining the transitions between steps based on the success or failure of each function.
Step Functions will handle all the orchestration, ensuring each Lambda function is invoked in the correct sequence with the proper input. It can handle complex branching logic, retries, error handling, and parallel execution. This allows you to build maintainable and resilient serverless applications without having to write complex coordination logic in your Lambda functions.
The other options are not suitable for this scenario:
A. Updating calculation logic in a reporting app doesn’t require task coordination across multiple services.
B. Updating the tech stack of a monolithic Java app is unrelated to serverless orchestration.
D. Serving static web content globally can be achieved with services like Amazon CloudFront and S3, without needing Step Functions.
Therefore, a serverless app needing to coordinate interdependent Lambda functions is the scenario that suggests using AWS Step Functions for orchestration. Its ability to define and manage complex workflows is critical for such applications.
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