Question 1,693 of 1,511
DOP-C02 SDLC Automation Practice Question
A company uses AWS CodePipeline with a source stage from Amazon S3 and a deploy stage to AWS Elastic Beanstalk. The pipeline has been working for months, but recently the deploy stage started failing with the error 'The S3 object does not exist.' The source artifact is uploaded to the S3 bucket by an external system. Which TWO actions should be taken to resolve this issue? (Choose TWO.)
⚠ Common exam trap
Many candidates assume the error is due to a permission or encryption issue (like SSE-KMS) rather than recognizing it as a classic race condition caused by object overwriting in a non-versioned bucket.
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
✓
Ensure the external system does not overwrite the object after the pipeline execution starts.
The deploy stage fails with 'The S3 object does not exist' when the external system overwrites the source artifact after the pipeline execution starts. CodePipeline references the object by its key at the time the pipeline is triggered; if the object is replaced (i.e., deleted and re-uploaded with the same key), the pipeline may attempt to download a version that no longer exists, especially if the S3 bucket is not versioned. Ensuring the external system does not overwrite the object during execution prevents this race condition.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Ensure the external system does not overwrite the object after the pipeline execution starts.
Why this is correct
Preventing overwrites ensures the object remains available.
- ✗
Change the source stage to use AWS CodeCommit instead of S3.
Why it's wrong here
Changing source type is unnecessary and may not address the root cause.
- ✓
Enable versioning on the S3 bucket and configure the pipeline to use the specific version ID.
Why this is correct
Versioning allows the pipeline to reference a fixed version of the artifact.
- ✗
Use server-side encryption with AWS KMS (SSE-KMS) on the S3 bucket.
Why it's wrong here
Encryption does not affect object existence.
- ✗
Increase the timeout for the deploy stage in the pipeline.
Why it's wrong here
Timeout does not address the object not existing.
Visual reference
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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Last reviewed: Jun 11, 2026
This DOP-C02 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 DOP-C02 exam.
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