- A
Create a CloudWatch Events rule that triggers a Lambda function to retry the failed stage.
Correct. EventBridge can monitor pipeline stage failures and trigger a Lambda function to automatically retry the failed stage.
- B
Configure the Retry setting in the Test stage's action configuration.
Why wrong: Incorrect. CodePipeline's retry setting on a stage action is not automatic; it requires manual invocation.
- C
Enable the 'Retry on failure' option in the CodePipeline pipeline settings.
Why wrong: Incorrect. CodePipeline does not have a global 'Retry on failure' setting.
- D
Use AWS Step Functions to orchestrate the pipeline and implement retries.
Why wrong: Incorrect. While Step Functions can orchestrate retries, it is a more complex solution than EventBridge and Lambda for this specific requirement.
Automatic Retry of CodePipeline Stage: Built-in Retry Configuration
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 team uses AWS CodePipeline with multiple stages: Source, Build, Test, and Deploy. The Test stage runs integration tests against a staging environment. Occasionally, the tests fail due to environment issues, not code issues. The team wants to automatically retry the Test stage up to two times if it fails, but not the Deploy stage. How can this be achieved?
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 CloudWatch Events rule that triggers a Lambda function to retry the failed stage.
The correct approach is to use Amazon EventBridge (formerly CloudWatch Events) to detect a stage failure in CodePipeline and trigger an AWS Lambda function that calls the RetryStageExecution API. This provides automatic retries without manual intervention. CodePipeline's built-in retry setting on a stage action is not automatic; it only allows manual retries via the console or API. Option D (Step Functions) is a valid alternative but adds unnecessary complexity for this use case.
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.
- ✓
Create a CloudWatch Events rule that triggers a Lambda function to retry the failed stage.
Why this is correct
Correct. EventBridge can monitor pipeline stage failures and trigger a Lambda function to automatically retry the failed stage.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Configure the Retry setting in the Test stage's action configuration.
Why it's wrong here
Incorrect. CodePipeline's retry setting on a stage action is not automatic; it requires manual invocation.
- ✗
Enable the 'Retry on failure' option in the CodePipeline pipeline settings.
Why it's wrong here
Incorrect. CodePipeline does not have a global 'Retry on failure' setting.
- ✗
Use AWS Step Functions to orchestrate the pipeline and implement retries.
Why it's wrong here
Incorrect. While Step Functions can orchestrate retries, it is a more complex solution than EventBridge and Lambda for this specific requirement.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap is that candidates may mistakenly believe CodePipeline supports automatic per-stage retries through a built-in configuration, when in fact the retry setting only enables manual retries. Automatic retries require external services like EventBridge and Lambda.
Detailed technical explanation
How to think about this question
CodePipeline's stage-level retry works by setting the 'Retry' field in the action configuration to a value between 1 and 10, which defines how many times the action will be retried after a failure. The retries are executed with a backoff mechanism that waits for a period before retrying, helping to mitigate transient environment issues. In a real-world scenario, this is particularly useful for integration tests that depend on external services or resources that may be temporarily unavailable, allowing the pipeline to recover without manual intervention.
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: Create a CloudWatch Events rule that triggers a Lambda function to retry the failed stage. — The correct approach is to use Amazon EventBridge (formerly CloudWatch Events) to detect a stage failure in CodePipeline and trigger an AWS Lambda function that calls the RetryStageExecution API. This provides automatic retries without manual intervention. CodePipeline's built-in retry setting on a stage action is not automatic; it only allows manual retries via the console or API. Option D (Step Functions) is a valid alternative but adds unnecessary complexity for this use case.
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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