easyMultiple ChoiceObjective-mapped
PDE Practice Question: A data scientist has iterated on a model and…
A data scientist has iterated on a model and produced a new version. The organization requires the ability to roll back to the previous version quickly if the new version performs poorly in production. Which approach should be used?
⚠ Common exam trap
Google Cloud often tests the misconception that version control tools (like Cloud Source Repositories) or storage buckets are sufficient for rollback, when in fact the key requirement is a managed model registry with traffic splitting capabilities for instant, no-downtime rollback.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Upload both versions to Vertex AI Model Registry and use endpoint traffic splitting to route 100% to the safe version if needed.
Vertex AI Model Registry allows you to deploy multiple model versions and use endpoint traffic splitting to gradually shift traffic or instantly route 100% to a specific version. This enables immediate rollback by setting the traffic split to 100% for the previous model version without redeploying or changing infrastructure.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Store each model version in a separate Cloud Storage bucket.
Why it's wrong here
This does not provide a deployment mechanism for quick rollback.
- ✗
Keep the previous model in a container image and redeploy via Cloud Run.
Why it's wrong here
This is slower and does not leverage Vertex AI's built-in version management.
- ✗
Use Cloud Source Repositories to tag model versions.
Why it's wrong here
Source repositories are for code, not model artifacts and deployment.
- ✓
Upload both versions to Vertex AI Model Registry and use endpoint traffic splitting to route 100% to the safe version if needed.
Why this is correct
The registry keeps versions; endpoint traffic allows instant switch.
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