Professional Cloud Developer

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QuestionQ23

Integrating applications with Google Cloud services

You must redesign audit-event ingestion from your authentication service so it can accommodate a substantial traffic increase. Currently, the audit service and authentication system run on the same Compute Engine virtual machine. You plan to use these Google Cloud tools in the new architecture:

  • Multiple Compute Engine machines, each running an authentication-service instance
  • Multiple Compute Engine machines, each running an audit-service instance
  • Pub/Sub to send events from the authentication services

How should the topics and subscriptions be configured to ensure the system handles a high message volume and scales efficiently?

Explanation

A single Pub/Sub topic can accept events from all authentication-service instances. Multiple audit-service instances can pull from the same pull subscription, with Pub/Sub distributing a subset of messages to each instance; this provides load-balanced consumption without duplicating every event to every audit worker. Pull subscriptions are suited to high-volume, throughput-critical processing.

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