The answer is to use Spot Instances for task nodes and right-size the EMR cluster. Spot Instances offer significant cost savings—often 60-90% less than On-Demand—for fault-tolerant workloads that can handle interruptions, as EMR automatically relaunches interrupted tasks on healthy nodes. Right-sizing ensures you provision only the compute and memory resources actually needed, avoiding waste from over-provisioned instances. On the AWS Certified Solutions Architect Professional SAP-C02 exam, this scenario tests your ability to apply cost optimization strategies for transient, resilient workloads, a common trap being to select Reserved Instances for steady-state usage or On-Demand for flexibility, both of which increase costs here. The key is recognizing that fault-tolerant batch jobs are ideal candidates for Spot pricing, while right-sizing aligns cluster capacity with actual demand. Memory tip: “Spot and size—don’t oversize” reminds you to pair interruption-tolerant instances with precise resource allocation.
SAP-C02 Continuous Improvement for Existing Solutions Practice Question
This SAP-C02 practice question tests your understanding of continuous improvement for existing solutions. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 company wants to reduce costs for a batch processing workload that runs nightly on Amazon EMR. The workload is fault-tolerant and can handle interruptions. Which TWO strategies should they implement? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Right-size the cluster by analyzing resource utilization metrics.
Using Spot instances reduces cost significantly for fault-tolerant workloads. Right-sizing the cluster ensures efficient resource use. Option A is correct (Spot) and Option D is correct (right-sizing). Option B (On-Demand) increases cost. Option C (Reserved Instances) is for steady-state. Option E (dedicated) is more expensive.
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.
✗
Use On-Demand Instances for all nodes.
Why it's wrong here
On-Demand is more expensive.
✓
Right-size the cluster by analyzing resource utilization metrics.
Why this is correct
Right-sizing prevents over-provisioning and reduces cost.
Related concept
Read the scenario before looking for a memorised answer.
✗
Purchase Reserved Instances for the cluster.
Why it's wrong here
Reserved Instances require commitment and are not ideal for variable workloads.
✗
Use Dedicated Instances to improve performance.
Why it's wrong here
Dedicated Instances are more expensive and not necessary.
✓
Use Spot Instances for task nodes.
Why this is correct
Spot Instances are cost-effective for fault-tolerant workloads.
Related concept
Read the scenario before looking for a memorised answer.
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 SAP-C02 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.
Continuous Improvement for Existing Solutions — This question tests Continuous Improvement for Existing Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Right-size the cluster by analyzing resource utilization metrics. — Using Spot instances reduces cost significantly for fault-tolerant workloads. Right-sizing the cluster ensures efficient resource use. Option A is correct (Spot) and Option D is correct (right-sizing). Option B (On-Demand) increases cost. Option C (Reserved Instances) is for steady-state. Option E (dedicated) is more expensive.
What should I do if I get this SAP-C02 question wrong?
Identify which SAP-C02 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.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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