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ACE Practice Question: A Cloud Function (gen2) is triggered by Pub/Sub…
This ACE practice question tests your understanding of a cloud function (gen2) is triggered by pub/sub…. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 Cloud Function (gen2) is triggered by Pub/Sub messages. The function processes each message by calling three external APIs sequentially. The total processing time is 25 seconds per message. The Pub/Sub subscription's ack deadline is 10 seconds. What will happen, and how should you fix it?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
Messages will be redelivered before processing completes; extend the Pub/Sub subscription ack deadline to exceed 25 seconds.
The ack deadline must be longer than the function processing time. Extending it to 30–60 seconds prevents premature redelivery. The minimum ack deadline is 10 seconds, maximum is 600 seconds on a subscription.
B
Distractor review
Increase the Cloud Function's memory to process faster and complete within 10 seconds.
The bottleneck is external API latency (sequential calls), not function memory. Increasing memory won't reduce external API call time.
C
Distractor review
Pub/Sub will wait indefinitely for the function to acknowledge; no issue occurs.
Pub/Sub does not wait indefinitely. After the ack deadline expires, the message is redelivered to another subscriber — causing duplicate processing.
D
Distractor review
The Cloud Function will automatically extend its own ack deadline via the Pub/Sub client library.
Cloud Functions triggered via Pub/Sub push subscriptions cannot extend ack deadlines — ack extension is a pull subscriber feature. Push functions must complete within the ack deadline.
Common exam trap
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Technical deep dive
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
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Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
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FAQ
Questions learners often ask
What does this ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Messages will be redelivered before processing completes; extend the Pub/Sub subscription ack deadline to exceed 25 seconds. — Pub/Sub's default ack deadline (10–600 seconds) defines how long the subscription waits before redelivering an unacknowledged message. If the Cloud Function takes 25 seconds to process but the ack deadline is 10 seconds, Pub/Sub redelivers the message before the function finishes, causing duplicate processing. The fix is to extend the ack deadline to at least 30 seconds (25 + buffer) on the subscription, or configure the minimum ack extension period in the subscription settings.
What should I do if I get this ACE question wrong?
Identify which ACE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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