- A
Use AWS CodeCommit triggers with Amazon SNS to send notifications and then manually trigger builds.
Why wrong: Manual intervention defeats automation.
- B
Use AWS CodeBuild with a webhook that triggers builds only for repositories where files changed, using buildspec filters.
CodeBuild webhooks can filter by file paths, triggering builds only for relevant services.
- C
Use AWS CodePipeline with a single pipeline that builds all services on every commit.
Why wrong: Building all services is inefficient and costly.
- D
Use Amazon EventBridge to detect repository changes and trigger AWS Lambda functions that determine which services changed.
Why wrong: Adding Lambda introduces unnecessary complexity.
Question 1,488 of 1,750
How to Trigger Builds Only for Changed Microservices
This DOP-C02 practice question tests your understanding of sdlc automation. 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 DevOps team is designing a CI/CD pipeline for a microservices application. Each service is stored in a separate repository. The team wants to build and test only the services that changed in a given commit. Which AWS solution is MOST efficient and cost-effective?
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
✓
Use AWS CodeBuild with a webhook that triggers builds only for repositories where files changed, using buildspec filters.
Option B is correct because AWS CodeBuild webhooks can be configured with buildspec filter patterns (e.g., using `git diff` or path-based globs) to trigger builds only for repositories where files changed. This avoids unnecessary builds for unchanged services, making it both efficient and cost-effective by minimizing compute time and resource usage.
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 AWS CodeCommit triggers with Amazon SNS to send notifications and then manually trigger builds.
Why it's wrong here
Manual intervention defeats automation.
- ✓
Use AWS CodeBuild with a webhook that triggers builds only for repositories where files changed, using buildspec filters.
Why this is correct
CodeBuild webhooks can filter by file paths, triggering builds only for relevant services.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS CodePipeline with a single pipeline that builds all services on every commit.
Why it's wrong here
Building all services is inefficient and costly.
- ✗
Use Amazon EventBridge to detect repository changes and trigger AWS Lambda functions that determine which services changed.
Why it's wrong here
Adding Lambda introduces unnecessary complexity.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may overcomplicate the solution by choosing EventBridge and Lambda (Option D) for change detection, missing that CodeBuild webhooks with buildspec filters provide a simpler, built-in, and more cost-effective mechanism for selective builds.
Detailed technical explanation
How to think about this question
CodeBuild webhooks use GitHub or Bitbucket webhook events (e.g., push, pull request) and evaluate buildspec filter groups with `git diff` against the previous commit to determine if files matching specified patterns have changed. This leverages Git's tree objects and blob hashes for efficient change detection without cloning the entire repository history. In a monorepo scenario, this approach can be extended with path-based filters to isolate service-specific builds, but for separate repositories, each repo's webhook naturally scopes builds to that service.
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.
TExam Day Tips
- 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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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: Use AWS CodeBuild with a webhook that triggers builds only for repositories where files changed, using buildspec filters. — Option B is correct because AWS CodeBuild webhooks can be configured with buildspec filter patterns (e.g., using `git diff` or path-based globs) to trigger builds only for repositories where files changed. This avoids unnecessary builds for unchanged services, making it both efficient and cost-effective by minimizing compute time and resource usage.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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