A company is modernizing a monolithic application into microservices. They have chosen Amazon ECS on AWS Fargate. The microservices need to communicate with each other asynchronously. Service A generates events that need to be processed by Service B and Service C. Service B must process every event, but Service C only needs to process events where the 'status' field is 'critical'. Which architecture is MOST decoupled and cost-effective?

Answer options:

Service A sends messages directly to Service B and Service C using HTTP APIs.

Service A sends messages to a single Amazon SQS queue. Both Service B and Service C poll the queue.

Service A publishes to an Amazon SNS topic. Service B and Service C have their own SQS queues subscribed to the topic. Service C's subscription uses a filter policy.

Service A writes events to an Amazon RDS database. Service B and Service C poll the database.

How to approach this question

Identify the SNS to SQS fan-out pattern with message filtering.

Full Answer

C.Service A publishes to an Amazon SNS topic. Service B and Service C have their own SQS queues subscribed to the topic. Service C's subscription uses a filter policy.✓ Correct

The SNS to SQS fan-out pattern is the standard for asynchronous microservice communication. Service A publishes once to SNS. SNS pushes to the SQS queues of Service B and C. Applying an SNS filter policy for Service C ensures it only receives relevant messages, reducing unnecessary processing.

Common mistakes

Having multiple services poll the same SQS queue.

Question 74 All questions

Practice the full AWS Solutions Architect Professional SAP-C02 Practice Exam 4

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