← DOP-C02·Amazon Web Services

Question 181 of 1,750

Incident and Event Response →hardMultiple ChoiceObjective-mapped

Recover from CloudFormation UPDATE_ROLLBACK_FAILED Using ContinueUpdateRollback

This DOP-C02 practice question tests your understanding of incident and event response. 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.

An organization uses AWS CloudFormation to manage infrastructure. During an incident, a stack update fails with 'UPDATE_ROLLBACK_FAILED' status. The engineer needs to bring the stack to a consistent state without losing data. What is the BEST approach?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

Clue: "best"
Why it matters: Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

A
Use the 'ContinueUpdateRollback' API to skip the resource that caused the failure.
This is the designed method to resolve rollback failures.
B
Create a new stack from the same template and migrate resources.
Why wrong: This is complex and may not be necessary.
C
Manually correct the resource configuration that caused the failure, then perform a stack update.
Why wrong: Manual changes outside CloudFormation are not recommended.
D
Delete the stack and then recreate it from the same template.
Why wrong: Deleting the stack might fail or cause data loss.

Full breakdown with real-world context →

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 the 'ContinueUpdateRollback' API to skip the resource that caused the failure.

The 'ContinueUpdateRollback' API is the best approach because it allows the stack to resume the rollback process, skipping the resource that caused the failure, and bringing the stack to a consistent 'UPDATE_ROLLBACK_COMPLETE' state without manual intervention or data loss. This API is specifically designed for the 'UPDATE_ROLLBACK_FAILED' status, enabling you to skip resources that cannot be rolled back (e.g., due to a non-reversible change) while preserving the rest of the stack's state.

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 the 'ContinueUpdateRollback' API to skip the resource that caused the failure.
Why this is correct
This is the designed method to resolve rollback failures.
Clue confirmation
The clue word "best" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new stack from the same template and migrate resources.
Why it's wrong here
This is complex and may not be necessary.
✗
Manually correct the resource configuration that caused the failure, then perform a stack update.
Why it's wrong here
Manual changes outside CloudFormation are not recommended.
✗
Delete the stack and then recreate it from the same template.
Why it's wrong here
Deleting the stack might fail or cause data loss.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often choose manual correction (Option C) thinking they can fix the resource and retry the update, but they overlook that the stack is in a failed rollback state that blocks further updates until the rollback is resolved, making 'ContinueUpdateRollback' the only viable path to a consistent state without data loss.

Detailed technical explanation

How to think about this question

Under the hood, when a stack update fails and enters 'UPDATE_ROLLBACK_FAILED', CloudFormation has attempted to roll back changes but encountered a resource that cannot be reverted (e.g., a manual deletion or a resource that was modified outside of CloudFormation). The 'ContinueUpdateRollback' API with the 'ResourcesToSkip' parameter allows you to specify the problematic resource, so CloudFormation marks it as 'skip' and completes the rollback for all other resources, leaving the skipped resource in its current state. This is critical in real-world scenarios where a database instance was accidentally deleted during rollback, and skipping it preserves the data while the stack recovers.

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.

What to study next

Got this wrong? Here's your next step.

Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.

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FAQ

Questions learners often ask

What does this DOP-C02 question test?

Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Use the 'ContinueUpdateRollback' API to skip the resource that caused the failure. — The 'ContinueUpdateRollback' API is the best approach because it allows the stack to resume the rollback process, skipping the resource that caused the failure, and bringing the stack to a consistent 'UPDATE_ROLLBACK_COMPLETE' state without manual intervention or data loss. This API is specifically designed for the 'UPDATE_ROLLBACK_FAILED' status, enabling you to skip resources that cannot be rolled back (e.g., due to a non-reversible change) while preserving the rest of the stack's state.

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.

Are there clue words in this question I should notice?

Yes — watch for: "best". Signals that multiple options may be partially correct. Choose the option that most directly solves the exact problem described, not the one that sounds most complete.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

2 more ways this is tested on DOP-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company uses AWS CloudFormation to manage infrastructure. During a deployment, a stack update fails and the stack is in ROLLBACK_IN_PROGRESS state. The DevOps engineer needs to investigate the failure while preserving the resources that were created before the failure. What should the engineer do?

medium

A.Delete the stack to start fresh.
B.Use the 'describe-stack-events' API to view the error and then manually fix the issue.
C.Call the 'cancel-update' API to stop the rollback and keep the current state.
✓ D.Use the 'continue-update-rollback' API with the 'resources-to-skip' parameter to skip the failing resource.

Why D: Option D is correct because using 'continue update rollback' with the 'resources to skip' parameter allows the engineer to skip specific resources and preserve them while continuing the rollback for others. Option A is wrong because deleting the stack removes all resources. Option B is wrong because 'describe stack events' provides information but does not prevent the rollback from continuing. Option C is wrong because 'cancel update' is not a valid operation; CloudFormation does not support canceling a rollback.

Variation 2. A company uses AWS CloudFormation to manage infrastructure. A recent stack update failed with the error 'UPDATE_ROLLBACK_FAILED'. The stack is now in a 'UPDATE_ROLLBACK_FAILED' state, and the engineer needs to fix the stack. What is the correct course of action?

hard

A.Contact AWS Support to fix the stack
B.Delete the stack and recreate it
C.Submit another stack update with the desired configuration
✓ D.Continue the rollback using the 'ContinueUpdateRollback' API

Why D: Option D is correct because the 'ContinueUpdateRollback' API allows you to resume the rollback of a stack that is in a 'UPDATE_ROLLBACK_FAILED' state. This action attempts to roll back the remaining resources that failed during the initial rollback, potentially skipping resources that cannot be rolled back. Option A is incorrect because AWS Support cannot fix the stack state; you need to take action yourself. Option B is incorrect because deleting a stack in 'UPDATE_ROLLBACK_FAILED' state may not succeed; you first need to continue the rollback or fix the underlying issues. Option C is incorrect because you cannot submit a new stack update while the stack is in a failed rollback state; you must first resolve the rollback failure.

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