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Question 203 - DVA-C02 discussion

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A developer is building an ecommerce application that uses multiple AWS Lambda functions. Each function performs a specific step in a customer order workflow, such as order processing and inventory management.

The developer must ensure that the Lambda functions run in a specific order.

Which solution will meet this requirement with the LEAST operational overhead?

A.

Configure an Amazon Simple Queue Service (Amazon SQS) queue to contain messages about each step a function must perform. Configure the Lambda functions to run sequentially based on the order of messages in the SQS queue.

Answers
A.

Configure an Amazon Simple Queue Service (Amazon SQS) queue to contain messages about each step a function must perform. Configure the Lambda functions to run sequentially based on the order of messages in the SQS queue.

B.

Configure an Amazon Simple Notification Service (Amazon SNS) topic to contain notifications about each step a function must perform. Subscribe the Lambda functions to the SNS topic. Use subscription filters based on the step each function must perform.

Answers
B.

Configure an Amazon Simple Notification Service (Amazon SNS) topic to contain notifications about each step a function must perform. Subscribe the Lambda functions to the SNS topic. Use subscription filters based on the step each function must perform.

C.

Configure an AWS Step Functions state machine to invoke the Lambda functions in a specific order.

Answers
C.

Configure an AWS Step Functions state machine to invoke the Lambda functions in a specific order.

D.

Configure Amazon EventBridge Scheduler schedules to invoke the Lambda functions in a specific order.

Answers
D.

Configure Amazon EventBridge Scheduler schedules to invoke the Lambda functions in a specific order.

Suggested answer: C

Explanation:

The requirement here is to ensure that Lambda functions are executed in a specific order. AWS Step Functions is a low-code workflow orchestration service that enables you to sequence AWS services, such as AWS Lambda, into workflows. It is purpose-built for situations like this, where different steps need to be executed in a strict sequence.

AWS Step Functions: Step Functions allows developers to design workflows as state machines, where each state corresponds to a particular function. In this case, the developer can create a Step Functions state machine where each step (order processing, inventory management, etc.) is represented by a Lambda function.

Operational Overhead: Step Functions have very low operational overhead because it natively handles retries, error handling, and function sequencing.

Alternatives:

Amazon SQS (Option A): While SQS can manage message ordering, it requires more manual handling of each step and the logic to sequentially invoke the Lambda functions.

Amazon SNS (Option B): SNS is a pub/sub service and is not designed to handle sequences of Lambda executions.

EventBridge (Option D): EventBridge Scheduler allows you to invoke Lambda functions based on scheduled times, but it doesn't directly support sequencing based on workflow logic. Therefore, AWS Step Functions is the most appropriate solution due to its native orchestration capabilities and minimal operational complexity.

AWS Step Functions documentation

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asked 23/10/2024
Asad yaseen
40 questions
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