Explanation:
The correct answer is D because deploying a new version and gradually migrating traffic from the old version to the new one allows for a seamless update. If any issues arise, traffic can be fully reverted to the old version quickly. This method avoids downtime and provides a safety net for rollback.
Refer to the GCP documentation on App Engine Migrating Traffic for more details on how to manage traffic between versions of your application.
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You've developed an update for your App Engine application and wish to deploy it without affecting your users, ensuring the ability to quickly revert if necessary. What's the best approach?
A
Deploy the update as the same version that is currently running.
B
Delete the current version of your application. Deploy the update using the same version identifier as the deleted version.
C
Notify your users of an upcoming maintenance window. Deploy the update in that maintenance window.
D
Deploy the update as a new version. Migrate traffic from the current version to the new version.