The answer is that the S3 bucket has versioning enabled, and the deploy action is trying to delete the bucket before syncing. When an S3 bucket has versioning enabled, a sync operation cannot delete the bucket itself because non-current object versions remain, causing the BucketNotEmpty error. CodePipeline’s deploy action typically uses the AWS CLI sync command, which does not remove versioned objects, so the bucket cannot be emptied and deleted as part of the deployment. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this question tests your understanding of how S3 versioning interacts with deployment automation—a common trap is assuming the error comes from bucket policies or source stage misconfiguration. Remember the key distinction: versioning preserves object history, so a sync that attempts to delete the bucket will fail unless you explicitly delete all versions and delete markers first. Memory tip: “Versioning keeps ghosts; sync can’t evict them.”
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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.
A company uses AWS CodePipeline to deploy a static website to Amazon S3. The pipeline has a Source stage from CodeCommit and a Deploy stage that syncs the contents to an S3 bucket. The deployment fails intermittently with a 'BucketNotEmpty' error. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
The S3 bucket has versioning enabled, and the deploy action is trying to delete the bucket before syncing.
When versioning is enabled, the bucket cannot be deleted until all versions are removed; the 'aws s3 sync' command may attempt to delete objects, but versioning causes issues.
B
The source artifact from CodeCommit contains a 'delete' manifest that instructs S3 to remove all files.
Why wrong: CodePipeline does not use a delete manifest.
C
The CodePipeline service role does not have permission to list the bucket contents.
Why wrong: Permission issues would cause 'AccessDenied', not 'BucketNotEmpty'.
D
The S3 bucket has a bucket policy that denies DeleteObject permissions.
Why wrong: The error is 'BucketNotEmpty', not an access denied error.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The S3 bucket has versioning enabled, and the deploy action is trying to delete the bucket before syncing.
Option B is correct because the error 'BucketNotEmpty' indicates the bucket has versioning enabled and the sync command does not delete previous versions. Option A is wrong because S3 bucket policies do not cause this error. Option C is wrong because CodePipeline does not enforce bucket deletion. Option D is wrong because the source stage is unrelated to the bucket's state.
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 S3 bucket has versioning enabled, and the deploy action is trying to delete the bucket before syncing.
Why this is correct
When versioning is enabled, the bucket cannot be deleted until all versions are removed; the 'aws s3 sync' command may attempt to delete objects, but versioning causes issues.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
The source artifact from CodeCommit contains a 'delete' manifest that instructs S3 to remove all files.
Why it's wrong here
CodePipeline does not use a delete manifest.
✗
The CodePipeline service role does not have permission to list the bucket contents.
Why it's wrong here
Permission issues would cause 'AccessDenied', not 'BucketNotEmpty'.
✗
The S3 bucket has a bucket policy that denies DeleteObject permissions.
Why it's wrong here
The error is 'BucketNotEmpty', not an access denied error.
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 DOP-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.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The S3 bucket has versioning enabled, and the deploy action is trying to delete the bucket before syncing. — Option B is correct because the error 'BucketNotEmpty' indicates the bucket has versioning enabled and the sync command does not delete previous versions. Option A is wrong because S3 bucket policies do not cause this error. Option C is wrong because CodePipeline does not enforce bucket deletion. Option D is wrong because the source stage is unrelated to the bucket's state.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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