GCP Professional Cloud Architect Practice Question

You are modernizing a food delivery platform currently running as a single virtual machine on Compute Engine. The business wants to split it into three loosely coupled services (Ordering, Rider Allocation, Notification). Requirements: each service must scale independently, communicate asynchronously to absorb surges, continue operating during downstream outages, and minimize infrastructure management with an event-driven model. Which design best meets these needs?

Deploy each service as Cloud Functions subscribed to its own Cloud Pub/Sub topic for inter-service messaging.
Package the services into Cloud Run and use Cloud Tasks queues for communication between them.
Migrate the services to separate App Engine flexible applications and rely on Cloud SQL tables for coordination.
Run the three services in a GKE cluster using StatefulSets and RabbitMQ for internal queues you operate.

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Answer Description

Cloud Functions scale horizontally based on incoming events with no servers to manage. When each service publishes events to a dedicated Cloud Pub/Sub topic, producers and consumers are fully decoupled, messages are durably stored and delivered at-least-once, and back-pressure is automatically absorbed. This satisfies independent scaling, asynchronous communication, and tolerance of downstream failures. Operating a RabbitMQ cluster on GKE requires additional administration, Cloud Tasks is intended for point-to-point task dispatch rather than broadcast event streams, and using Cloud SQL tables with App Engine is synchronous and tightly couples services.

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