The answer is Amazon CloudWatch with the CloudWatch Agent installed on the EMR nodes, because standard EMR metrics like HDFS or YARN utilization do not include granular per-node CPU and memory usage. To monitor EMR cluster CPU and memory utilization with CloudWatch, you must install the CloudWatch Agent on each node to push custom metrics, or leverage the EMR metrics integration that sends resource-level data to CloudWatch. On the AWS Certified Data Engineer Associate DEA-C01 exam, this question tests your ability to distinguish between services that collect operational data versus those that log API calls or track configuration—a common trap is choosing CloudTrail (which only records API activity) or AWS Config (which tracks resource changes). Remember that CloudWatch is for performance metrics, CloudTrail is for audit trails, and Config is for compliance. Memory tip: "Watch the watchman" — CloudWatch watches resource usage, while CloudTrail trails API calls.
DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 company runs a daily batch processing job on Amazon EMR that reads data from Amazon S3 and writes results back to S3. The job takes longer than expected. The engineer wants to monitor the job's resource utilization. Which AWS service should be used to collect and visualize metrics such as CPU and memory usage of the EMR cluster's nodes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Amazon CloudWatch with the CloudWatch Agent installed on the EMR nodes.
Option A is correct because CloudWatch can collect custom metrics from EMR via the CloudWatch agent or EMR metrics integration. Option B is incorrect because CloudTrail records API calls, not resource utilization. Option C is incorrect because AWS Config tracks configuration changes. Option D is incorrect because Athena is a query service, not a monitoring service.
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.
✗
AWS Config to record configuration changes in the EMR cluster.
Why it's wrong here
AWS Config tracks resource configuration, not performance metrics.
✗
Amazon Athena to query EMR job logs stored in S3.
Why it's wrong here
Athena can query logs, but does not provide real-time resource utilization metrics.
✓
Amazon CloudWatch with the CloudWatch Agent installed on the EMR nodes.
Why this is correct
CloudWatch can collect CPU, memory, and disk metrics from EC2 instances (EMR nodes) via the CloudWatch Agent.
Related concept
Read the scenario before looking for a memorised answer.
✗
AWS CloudTrail to log API calls made by the EMR job.
Why it's wrong here
CloudTrail logs API calls, not resource utilization metrics.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which DEA-C01 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.
Data Operations and Support — This question tests Data Operations and Support — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Amazon CloudWatch with the CloudWatch Agent installed on the EMR nodes. — Option A is correct because CloudWatch can collect custom metrics from EMR via the CloudWatch agent or EMR metrics integration. Option B is incorrect because CloudTrail records API calls, not resource utilization. Option C is incorrect because AWS Config tracks configuration changes. Option D is incorrect because Athena is a query service, not a monitoring service.
What should I do if I get this DEA-C01 question wrong?
Identify which DEA-C01 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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This DEA-C01 practice question is part of Courseiva's free Amazon Web Services 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 DEA-C01 exam.
Question Discussion
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