Exam Professional Cloud Developer topic 1 question 107 discussion

Actual exam question from Google's Professional Cloud Developer

Question #: 107
Topic #: 1

[All Professional Cloud Developer Questions]

You recently migrated a monolithic application to Google Cloud by breaking it down into microservices. One of the microservices is deployed using Cloud
Functions. As you modernize the application, you make a change to the API of the service that is backward-incompatible. You need to support both existing callers who use the original API and new callers who use the new API. What should you do?

A. Leave the original Cloud Function as-is and deploy a second Cloud Function with the new API. Use a load balancer to distribute calls between the versions.
B. Leave the original Cloud Function as-is and deploy a second Cloud Function that includes only the changed API. Calls are automatically routed to the correct function.
C. Leave the original Cloud Function as-is and deploy a second Cloud Function with the new API. Use Cloud Endpoints to provide an API gateway that exposes a versioned API.
D. Re-deploy the Cloud Function after making code changes to support the new API. Requests for both versions of the API are fulfilled based on a version identifier included in the call.

Show Suggested Answer

Suggested Answer: C 🗳️

by scaenruy at Jan. 9, 2022, 5:52 p.m.

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GCPCloudArchitectUser

Highly Voted 1 year, 11 months ago

Selected Answer: C

Based on the link … where it says for backward incompatible strategy use two separate deployments/instances v1 and v2 and only C option is inline with the link

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omermahgoub

Most Recent 1 year, 1 month ago

Answer is C When making backward-incompatible changes to an API, it's important to provide a way for existing callers to continue using the old API while still supporting new callers who use the new API. One way to do this is by deploying a new version of the Cloud Function that includes the new API, and leaving the old function as-is. By using Cloud Endpoints you can create an API Gateway that can handle multiple versions of the API, so that requests to different versions of the API can be routed to the corresponding Cloud Function. This allows you to maintain both versions of the API and have control over which version is exposed to the users. This approach allows you to continue supporting existing callers while also introducing new features to the application through the new version. Also, it gives you a lot more flexibility in terms of rollout, testing, and monitoring.

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zellck

1 year, 1 month ago

Selected Answer: C

C is the answer. https://cloud.google.com/endpoints/docs/openapi/versioning-an-api#backwards-incompatible When you make changes to your API that breaks your customers' client code, as a best practice, increment the major version number of your API. Endpoints can run more than one major version of an API concurrently. By providing both versions of the API, your customers can pick which version they want to use and control when they migrate to the new version.

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