Exam Professional Cloud Developer topic 1 question 345 discussion

Actual exam question from Google's Professional Cloud Developer

Question #: 345
Topic #: 1

[All Professional Cloud Developer Questions]

You work for an organization that manages an ecommerce site. Your application is deployed behind an external Application Load Balancer. You need to test a new product recommendation algorithm. You plan to use A/B testing to determine the new algorithm’s effect on sales in a randomized way. How should you test this feature?

A. Split traffic between versions using weights.
B. Enable the new recommendation feature flag on a single instance.
C. Mirror traffic to the new version of your application.
D. Use HTTP header-based routing.

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Suggested Answer: A 🗳️

by Pime13 at July 15, 2025, 7:42 p.m.

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Pime13

3 weeks, 6 days ago

Selected Answer: A

Weighted traffic splitting is a built-in feature of external Application Load Balancers on Google Cloud and AWS2. It allows you to route a percentage of user traffic to different backend services or versions — for example, 90% to the current recommendation engine and 10% to the new algorithm. This setup ensures randomized exposure, which is essential for statistically valid A/B testing. You can gradually adjust weights as confidence in the new version grows, and roll back instantly if needed.

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