The answer is a misconfigured KeepClusterAliveOnFailure parameter set to true, which overrides the auto-termination behavior even when a step completes successfully. When you troubleshoot EMR cluster not terminating after step completion, the key detail is that KeepClusterAliveOnFailure controls whether the cluster stays alive regardless of step outcome—if true, the cluster persists even on success, while ActionOnFailure set to CONTINUE merely tells the cluster to proceed to the next step rather than fail. On the AWS Certified Data Engineer Associate DEA-C01 exam, this tests your understanding of EMR step lifecycle and termination logic, often appearing as a trap where candidates assume a COMPLETED step always triggers auto-termination. The common mistake is confusing ActionOnFailure with KeepClusterAliveOnFailure—the former dictates step-level behavior, the latter controls cluster-level persistence. Memory tip: think "Keep Alive = Keep Alive no matter what"—if it's true, the cluster stays up regardless of step success or failure.
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 uses Amazon EMR to run Spark jobs on a transient cluster. The jobs are submitted via a step in the cluster. The cluster is configured to auto-terminate after the last step completes. However, the cluster is not terminating even though the step shows as 'COMPLETED'. What could be the cause?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The step's 'ActionOnFailure' parameter is set to 'CONTINUE' and 'KeepClusterAliveOnFailure' is true.
Option B is correct because if KeepClusterAliveOnFailure is set to true for a step, the cluster will not terminate even if the step succeeds. Option A is wrong because 'COMPLETED' indicates success. Option C is wrong because the root volume size does not affect termination. Option D is wrong because cluster is transient, not long-running.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 cluster's root device size is too large.
Why it's wrong here
Root device size does not affect termination.
✗
The step failed with an error, but the status shows 'COMPLETED' due to a reporting bug.
Why it's wrong here
Status is reliable.
✗
The cluster is configured as a long-running cluster.
Why it's wrong here
It is described as transient.
✓
The step's 'ActionOnFailure' parameter is set to 'CONTINUE' and 'KeepClusterAliveOnFailure' is true.
Why this is correct
These settings prevent auto-termination.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Operations and Support — This question tests Data Operations and Support — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The step's 'ActionOnFailure' parameter is set to 'CONTINUE' and 'KeepClusterAliveOnFailure' is true. — Option B is correct because if KeepClusterAliveOnFailure is set to true for a step, the cluster will not terminate even if the step succeeds. Option A is wrong because 'COMPLETED' indicates success. Option C is wrong because the root volume size does not affect termination. Option D is wrong because cluster is transient, not long-running.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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