PCA Question 89

Community Discussion

Written by other learners. Comments can disagree with the marked answer — check the official documentation when in doubt.

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  B. Deploy the update as a new version in the App Engine application, and split traffic between the new and current versions. To test an update to an App Engine application with production traffic before replacing the current version, you can deploy the update as a new version in the App Engine application and split traffic between the new and current versions. This is known as a "blue-green" deployment, and it allows you to test the new version with a portion of production traffic while the current version is still serving the remainder of traffic. To split traffic between the new and current versions, you can use the App Engine traffic splitting feature. This feature allows you to specify the percentage of traffic that should be sent to each version, and it can be used to gradually ramp up traffic to the new version over time. This allows you to test the new version with a small portion of traffic initially, and gradually increase the traffic as you become more confident in the update.

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  Other options, such as deploying the update in a new VPC or as a new App Engine application, are not recommended for testing updates with production traffic, as they can be more complex and may require additional steps to set up.

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  Answer B : You can use traffic splitting to specify a percentage distribution of traffic across two or more of the versions within a service. Splitting traffic allows you to conduct A/B testing between your versions and provides control over the pace when rolling out features. Traffic splitting is applied to URLs that do not explicitly target a version. For example, the following URLs split traffic because they target all the available versions within the specified service: https://cloud.google.com/appengine/docs/standard/splitting-traffic