- A
Set `min_replica_count=1` to keep at least one replica always warm.
A single warm replica handles traffic immediately while autoscaling adds more.
- B
Use a prebuilt container for the model framework to reduce image size.
Why wrong: Custom container is already needed; prebuilt may not have custom dependencies.
- C
Enable container memory optimization to reduce startup time.
Why wrong: Startup time is dominated by container image download and model loading, not memory optimization.
- D
Provision a Persistent Disk (SSD) for the container image to speed up download.
Why wrong: Persistent disk is not used for container image caching; image is stored in Container Registry and pulled each time.
Question 795 of 1,000
hardMultiple ChoiceObjective-mapped
Fixing Cold Start Latency on Vertex AI with Custom Containers
This PMLE practice question tests your understanding of pmle exam topics. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A team deploys a real-time model using a custom container on Vertex AI Prediction. The container is large (5 GB) and cold starts are causing latency spikes. The endpoint is configured with `min_replica_count=0` to reduce cost. The team wants to keep the cost low while reducing cold starts. What is the best approach?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"best"Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
Quick Answer
The answer is to set `min_replica_count=1`, which keeps at least one replica always warm and directly eliminates cold start latency for most traffic. This works because Vertex AI’s autoscaling, when `min_replica_count=0`, spins down all replicas to save cost, but a large 5 GB custom container then requires a full cold start—pulling the image, initializing dependencies, and loading the model—before serving the first request. On the Google Professional Machine Learning Engineer exam, this scenario tests your understanding of the trade-off between cost and latency in real-time inference, where the common trap is assuming that optimizing the container image or storage alone (like prebuilding images or using SSDs) can remove the startup overhead. The key insight is that cold start latency is a scaling policy problem, not a container optimization problem. Memory tip: “One warm pod beats any cold start trick”—always think of `min_replica_count` as the first lever to pull when latency spikes from idle scaling.
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
✓
Set `min_replica_count=1` to keep at least one replica always warm.
Option A is correct because setting min_replica_count=1 ensures that at least one replica is always running, eliminating cold starts for most requests. The container is large, but keeping a replica warm avoids the cold start latency. Option B is incorrect because using a prebuilt container may reduce image size but does not directly address cold starts; it might help with download time but not eliminate cold starts. Option C is incorrect because container memory optimization does not significantly reduce startup time for a large container. Option D is incorrect because provisioning a Persistent Disk (SSD) speeds up image download but does not fully eliminate cold start latency; the replica still needs to initialize.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Set `min_replica_count=1` to keep at least one replica always warm.
Why this is correct
A single warm replica handles traffic immediately while autoscaling adds more.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a prebuilt container for the model framework to reduce image size.
Why it's wrong here
Custom container is already needed; prebuilt may not have custom dependencies.
- ✗
Enable container memory optimization to reduce startup time.
Why it's wrong here
Startup time is dominated by container image download and model loading, not memory optimization.
- ✗
Provision a Persistent Disk (SSD) for the container image to speed up download.
Why it's wrong here
Persistent disk is not used for container image caching; image is stored in Container Registry and pulled each time.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
What to study next
Got this wrong? Here's your next step.
Identify which PMLE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this PMLE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Set `min_replica_count=1` to keep at least one replica always warm. — Option A is correct because setting min_replica_count=1 ensures that at least one replica is always running, eliminating cold starts for most requests. The container is large, but keeping a replica warm avoids the cold start latency. Option B is incorrect because using a prebuilt container may reduce image size but does not directly address cold starts; it might help with download time but not eliminate cold starts. Option C is incorrect because container memory optimization does not significantly reduce startup time for a large container. Option D is incorrect because provisioning a Persistent Disk (SSD) speeds up image download but does not fully eliminate cold start latency; the replica still needs to initialize.
What should I do if I get this PMLE question wrong?
Identify which PMLE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jun 24, 2026
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