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Question 222 - Professional Cloud Developer discussion

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You work for an organization that manages an ecommerce site. Your application is deployed behind a global HTTP(S) 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.
Answers
A.
Split traffic between versions using weights.
B.
Enable the new recommendation feature flag on a single instance.
Answers
B.
Enable the new recommendation feature flag on a single instance.
C.
Mirror traffic to the new version of your application.
Answers
C.
Mirror traffic to the new version of your application.
D.
Use HTTP header-based routing.
Answers
D.
Use HTTP header-based routing.
Suggested answer: C

Explanation:

https://cloud.google.com/load-balancing/docs/https/traffic-management-global#traffic_actions_weight-based_traffic_splitting

Deploying a new version of an existing production service generally incurs some risk. Even if your tests pass in staging, you probably don't want to subject 100% of your users to the new version immediately. With traffic management, you can define percentage-based traffic splits across multiple backend services.

For example, you can send 95% of the traffic to the previous version of your service and 5% to the new version of your service. After you've validated that the new production version works as expected, you can gradually shift the percentages until 100% of the traffic reaches the new version of your service. Traffic splitting is typically used for deploying new versions, A/B testing, service migration, and similar processes.

https://cloud.google.com/traffic-director/docs/advanced-traffic-management#weight-based_traffic_splitting_for_safer_deployments

https://cloud.google.com/architecture/implementing-deployment-and-testing-strategies-on-gke#split_the_traffic_2

https://cloud.google.com/load-balancing/docs/https/traffic-management-global#traffic_actions_weight-based_traffic_splitting

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asked 18/09/2024
Martin Simmons
40 questions
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