Google PCA Ensure solution and operations reliability Practice Question
This PCA practice question tests your understanding of ensure solution and operations reliability. 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 startup uses Cloud Functions for event-driven processing. They notice some functions are timing out. How to increase reliability without changing the business logic?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable retry on failure for the event-driven function
Option C is correct because enabling retry on failure for event-driven Cloud Functions allows the platform to automatically retry the invocation when a function times out or fails, without modifying the business logic. This leverages the built-in retry mechanism for background functions, which uses exponential backoff to handle transient failures and improve reliability.
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.
✗
Increase the function timeout to the maximum allowed
Why it's wrong here
This may help but doesn't address transient failures that could be resolved by retrying.
✗
Use Cloud Tasks to decouple and retry synchronously
Why it's wrong here
Cloud Tasks is for asynchronous task queues, not directly for Cloud Functions retry.
✓
Enable retry on failure for the event-driven function
Why this is correct
Cloud Functions supports automatic retry for event-driven triggers, which handles transient timeouts.
Related concept
Read the scenario before looking for a memorised answer.
✗
Refactor the function to reduce complexity
Why it's wrong here
Refactoring may not address timeout issues if the function already has sufficient timeout.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that increasing timeout or refactoring code is the only way to handle timeouts, but the trap here is that enabling retry on failure is a configuration-only change that improves reliability without altering business logic.
Detailed technical explanation
How to think about this question
Cloud Functions for event-driven (background) sources, such as Cloud Storage or Pub/Sub, support automatic retries via the `--retry` flag or `event_trigger.retry` configuration. When a function returns an error or times out, the platform re-queues the event with exponential backoff (up to 7 days by default) and jitter, ensuring transient failures are handled without manual intervention. This mechanism is distinct from HTTP functions, which require explicit retry logic in the client or via Cloud Tasks.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this PCA question in full detail.
Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable retry on failure for the event-driven function — Option C is correct because enabling retry on failure for event-driven Cloud Functions allows the platform to automatically retry the invocation when a function times out or fails, without modifying the business logic. This leverages the built-in retry mechanism for background functions, which uses exponential backoff to handle transient failures and improve reliability.
What should I do if I get this PCA 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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Question Discussion
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