AWS Application Integration Services Flashcards

A workflow processes high-volume IoT events, each finishing in under a minute, and at-least-once execution is acceptable. Which Step Functions workflow type is most cost-effective?

Answer: Express workflow

Express workflows are designed for high-volume, short-duration (up to 5 minutes) workloads and are cheaper at scale.

A payment workflow can run for several days and must never execute a step more than once. Which Step Functions workflow type should be used?

Answer: Standard workflow

Standard workflows support executions up to one year with exactly-once workflow execution semantics.

A company is migrating an on-premises application that uses JMS with Apache ActiveMQ to AWS and wants to avoid rewriting messaging code. Which service is best?

Answer: Amazon MQ

Amazon MQ is a managed broker for ActiveMQ and RabbitMQ that supports standard protocols like JMS, AMQP, MQTT, and STOMP.

A marketing team needs to transfer Salesforce data into Amazon S3 on a schedule without writing integration code. Which service should they use?

Answer: Amazon AppFlow

Amazon AppFlow is a no-code service for securely transferring data between SaaS applications like Salesforce and AWS services.

A Step Functions workflow must process millions of objects stored in Amazon S3 with high concurrency. Which state is designed for this?

Answer: Map state in Distributed mode

Distributed Map runs large-scale parallel child workflows over items such as S3 objects, with up to 10,000 concurrent child executions.

A Step Functions workflow must pause until a manager approves a request through an external web app. Which integration pattern should be used?

Answer: Wait for a Callback with Task Token (.waitForTaskToken)

The callback pattern passes a task token to an external system and pauses until SendTaskSuccess or SendTaskFailure is called with that token.

A Lambda function processes SQS messages in batches of 10. When one message fails, the whole batch is retried, causing duplicate work. What should the developer enable?

Answer: Partial batch responses using ReportBatchItemFailures

With ReportBatchItemFailures, the function returns only the failed message IDs so successful messages are deleted and not retried.