ExpertHard1 markMultiple Choice
AZ-305 · Question 43 · Domain 4.2: Application Architecture
You are designing an event-driven microservices architecture for an e-commerce platform.
When a customer places an order, an 'OrderCreated' message is generated. This message must be processed by three separate downstream microservices: Inventory, Billing, and Shipping.
Requirements:
- Each microservice must receive its own copy of the message.
- If a microservice is temporarily offline, the message must be retained until the service comes back online.
- Messages must be processed in the exact order they were received (FIFO).
Which messaging service should you recommend?
You are designing an event-driven microservices architecture for an e-commerce platform.
When a customer places an order, an 'OrderCreated' message is generated. This message must be processed by three separate downstream microservices: Inventory, Billing, and Shipping.
Requirements:
- Each microservice must receive its own copy of the message.
- If a microservice is temporarily offline, the message must be retained until the service comes back online.
- Messages must be processed in the exact order they were received (FIFO).
Which messaging service should you recommend?
Answer options:
A.
Azure Event Grid
B.
Azure Service Bus Queues
C.
Azure Service Bus Topics and Subscriptions
D.
Azure Event Hubs
How to approach this question
Match 'multiple receivers' to Topics/Pub-Sub. Match 'retained if offline' and 'FIFO' to Service Bus.
Full Answer
C.Azure Service Bus Topics and Subscriptions✓ Correct
Azure Service Bus Topics and Subscriptions
Azure Service Bus Topics and Subscriptions provide a publish/subscribe (1:N) messaging model. The order service publishes one message to the Topic. The Inventory, Billing, and Shipping services each have their own Subscription to that Topic, meaning they each get a copy of the message. Service Bus is an enterprise message broker that guarantees message delivery, retains messages if a receiver is offline, and supports strict FIFO (First-In-First-Out) ordering using Message Sessions.
Common mistakes
Choosing Service Bus Queues. Queues are 1:1; the first service to read the message consumes it, leaving the others with nothing.
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