- A
Store JIRA keys in an S3 bucket and configure a CloudWatch Events rule to check commits
Why wrong: Complex and not directly integrated with CodeCommit.
- B
Create a CodeCommit trigger that invokes an AWS Lambda function to validate the pull request description and reject if missing JIRA key
Server-side enforcement via triggers.
- C
Use AWS CodeBuild to run a validation script during the build phase
Why wrong: Build phase runs after commit, does not block the pull request.
- D
Require developers to install a pre-commit hook script locally
Why wrong: Client-side hooks can be bypassed.
Question 839 of 1,750
Require JIRA Key in CodeCommit Pull Request Descriptions
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 is using AWS CodeCommit with multiple repositories. Developers are required to create pull requests for all changes, and the pull request must be associated with a JIRA issue key (e.g., PROJ-123) in the commit message. A DevOps engineer needs to enforce this policy automatically. Which approach meets the requirement with minimal operational overhead?
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
✓
Create a CodeCommit trigger that invokes an AWS Lambda function to validate the pull request description and reject if missing JIRA key
Option B is correct because CodeCommit triggers can invoke an AWS Lambda function on pull request events (e.g., created or updated). The Lambda function can parse the pull request description or commit messages for a JIRA key pattern (e.g., regex `[A-Z]+-\d+`) and, if missing, automatically reject the pull request by updating its status or adding a comment. This serverless approach enforces the policy without requiring any changes to developer workflows or additional infrastructure, minimizing operational overhead.
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.
- ✗
Store JIRA keys in an S3 bucket and configure a CloudWatch Events rule to check commits
Why it's wrong here
Complex and not directly integrated with CodeCommit.
- ✓
Create a CodeCommit trigger that invokes an AWS Lambda function to validate the pull request description and reject if missing JIRA key
Why this is correct
Server-side enforcement via triggers.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use AWS CodeBuild to run a validation script during the build phase
Why it's wrong here
Build phase runs after commit, does not block the pull request.
- ✗
Require developers to install a pre-commit hook script locally
Why it's wrong here
Client-side hooks can be bypassed.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may choose Option C (CodeBuild) because they assume build-time validation is sufficient, but they overlook that CodeBuild runs after the pull request is merged, not before, making it ineffective for pre-merge enforcement.
Detailed technical explanation
How to think about this question
CodeCommit triggers use Amazon CloudWatch Events (now Amazon EventBridge) to capture repository events such as `PullRequestCreated` or `PullRequestSourceBranchUpdated`. The Lambda function receives an event payload containing the pull request ID and repository details, then uses the CodeCommit API (e.g., `get_pull_request` and `get_comments`) to retrieve the pull request description and associated commits. A common subtlety is that the Lambda function must have IAM permissions to update the pull request (e.g., `codecommit:UpdatePullRequestStatus`) and must handle idempotency to avoid duplicate rejections on repeated triggers.
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 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.
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: Create a CodeCommit trigger that invokes an AWS Lambda function to validate the pull request description and reject if missing JIRA key — Option B is correct because CodeCommit triggers can invoke an AWS Lambda function on pull request events (e.g., created or updated). The Lambda function can parse the pull request description or commit messages for a JIRA key pattern (e.g., regex `[A-Z]+-\d+`) and, if missing, automatically reject the pull request by updating its status or adding a comment. This serverless approach enforces the policy without requiring any changes to developer workflows or additional infrastructure, minimizing operational overhead.
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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