- A
The Cloud Run service's container image is too large; reduce image size.
Why wrong: Image size can contribute to cold start time but is not the primary identified cause here. The question describes a classic cold start symptom.
- B
Set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency.
min-instances: 1 prevents scale-to-zero, keeping a container warm. The first request after inactivity hits a ready instance instead of waiting for container startup.
- C
Switch from Cloud Run to GKE, which doesn't have cold starts.
Why wrong: GKE with HPA can have similar pod-startup delays when scaling from zero. More importantly, switching to GKE is a major architectural change and not cost-effective for this use case.
- D
Increase Cloud Run's request timeout to 30 seconds to accommodate cold starts.
Why wrong: Increasing timeout doesn't fix the cold start — it just tolerates it. The user experience is still degraded on the first request.
How to Eliminate Cloud Run Cold Starts with min-instances
This ACE practice question tests your understanding of ace exam topics. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
You have a Cloud Run service configured with `min-instances: 0`. During load testing you notice the first request after a period of inactivity takes 3–5 seconds instead of the normal 100ms. Subsequent requests are fast. What is causing this, and what is the most cost-effective fix?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"first"Why it matters: Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
Quick Answer
The answer is to set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency. This delay occurs because Cloud Run must spin up a new container from scratch when `min-instances: 0` is configured, and the 3–5 second lag you observed is the container initialization time—subsequent requests are fast because the instance stays warm. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of how Cloud Run’s scaling behavior directly impacts latency, and the common trap is to suggest increasing CPU or memory, which doesn’t fix cold starts if the bottleneck is container startup time. The most cost-effective fix is a single always-warm instance, adding only a small cost. Remember the mnemonic: “One warm instance beats a cold start every time.”
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-instances: 1` to keep a warm instance running and eliminate the cold start latency.
Cold starts occur when Cloud Run needs to spin up a new container instance from zero. The 3–5 second delay is the container startup time. Setting `min-instances: 1` keeps at least one instance warm at all times, eliminating cold starts for the first request. This adds a small cost (one always-running instance) but is the most targeted fix. Increasing memory or CPU doesn't directly address cold start if the issue is container initialization time.
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.
- ✗
The Cloud Run service's container image is too large; reduce image size.
Why it's wrong here
Image size can contribute to cold start time but is not the primary identified cause here. The question describes a classic cold start symptom.
- ✓
Set `min-instances: 1` to keep a warm instance running and eliminate the cold start latency.
Why this is correct
min-instances: 1 prevents scale-to-zero, keeping a container warm. The first request after inactivity hits a ready instance instead of waiting for container startup.
Clue confirmation
The clue word "first" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Switch from Cloud Run to GKE, which doesn't have cold starts.
Why it's wrong here
GKE with HPA can have similar pod-startup delays when scaling from zero. More importantly, switching to GKE is a major architectural change and not cost-effective for this use case.
- ✗
Increase Cloud Run's request timeout to 30 seconds to accommodate cold starts.
Why it's wrong here
Increasing timeout doesn't fix the cold start — it just tolerates it. The user experience is still degraded on the first request.
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.
Trap categories for this question
Similar concept trap
GKE with HPA can have similar pod-startup delays when scaling from zero. More importantly, switching to GKE is a major architectural change and not cost-effective for this use 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 ACE 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 ACE 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-instances: 1` to keep a warm instance running and eliminate the cold start latency. — Cold starts occur when Cloud Run needs to spin up a new container instance from zero. The 3–5 second delay is the container startup time. Setting `min-instances: 1` keeps at least one instance warm at all times, eliminating cold starts for the first request. This adds a small cost (one always-running instance) but is the most targeted fix. Increasing memory or CPU doesn't directly address cold start if the issue is container initialization time.
What should I do if I get this ACE question wrong?
Identify which ACE 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: "first". Order matters here. You are being tested on which action comes before the others — not which action is generally useful.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: May 18, 2026
This ACE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ACE exam.
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