- A
Configure a single pipeline that always builds all microservices.
Why wrong: Building all microservices wastes time and resources when only one changes.
- B
Create separate CodeCommit repositories for each microservice.
Why wrong: This breaks the monorepo approach which the company wants to keep.
- C
Use an AWS Lambda function triggered by CloudWatch Events for CodeCommit to start the specific pipeline for the changed microservice.
Lambda can analyze the commit and start the relevant pipeline, building only the changed microservice.
- D
Use a single pipeline with multiple build actions that each check if their microservice changed.
Why wrong: This still runs all build actions, wasting resources.
Question 1,230 of 1,750
Triggering Specific Pipelines for Changed Microservices in a Monorepo
This DOP-C02 practice question tests your understanding of sdlc automation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 has a monorepo in AWS CodeCommit with multiple microservices. They want to use AWS CodePipeline to build and deploy only the microservice that changed. What is the MOST efficient approach?
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 an AWS Lambda function triggered by CloudWatch Events for CodeCommit to start the specific pipeline for the changed microservice.
Option C is correct because it uses an AWS Lambda function triggered by CloudWatch Events (now Amazon EventBridge) on CodeCommit repository events (e.g., push to a specific branch) to detect which microservice changed and then start the corresponding CodePipeline pipeline. This is the most efficient approach as it avoids unnecessary builds of unchanged microservices and does not require splitting the monorepo or adding complex conditional logic within a single pipeline.
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.
- ✗
Configure a single pipeline that always builds all microservices.
Why it's wrong here
Building all microservices wastes time and resources when only one changes.
- ✗
Create separate CodeCommit repositories for each microservice.
Why it's wrong here
This breaks the monorepo approach which the company wants to keep.
- ✓
Use an AWS Lambda function triggered by CloudWatch Events for CodeCommit to start the specific pipeline for the changed microservice.
Why this is correct
Lambda can analyze the commit and start the relevant pipeline, building only the changed microservice.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use a single pipeline with multiple build actions that each check if their microservice changed.
Why it's wrong here
This still runs all build actions, wasting resources.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think a single pipeline with conditional build actions (Option D) is efficient, but they miss that the pipeline still triggers on every change, wasting pipeline executions and build minutes for unchanged microservices.
Detailed technical explanation
How to think about this question
Under the hood, the Lambda function can parse the CodeCommit event payload to identify the changed files (using the 'Records' array with 'codecommit' event source) and map file paths to specific microservices. The function then calls the CodePipeline StartPipelineExecution API for the correct pipeline. This approach leverages event-driven architecture to minimize latency and cost, and is a common pattern for monorepo CI/CD where granular triggering is needed without splitting the repository.
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 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. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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 an AWS Lambda function triggered by CloudWatch Events for CodeCommit to start the specific pipeline for the changed microservice. — Option C is correct because it uses an AWS Lambda function triggered by CloudWatch Events (now Amazon EventBridge) on CodeCommit repository events (e.g., push to a specific branch) to detect which microservice changed and then start the corresponding CodePipeline pipeline. This is the most efficient approach as it avoids unnecessary builds of unchanged microservices and does not require splitting the monorepo or adding complex conditional logic within a single pipeline.
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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