- A
Use Cloud Functions instead of Cloud Run
Why wrong: Cloud Functions have similar concurrency limits and would likely face the same issue.
- B
Increase the maximum number of retries on the Eventarc trigger
Why wrong: Retries help with transient failures but do not prevent 429 errors due to overload.
- C
Increase the Cloud Run service's request timeout
Why wrong: Timeout does not affect concurrency handling; the service still gets too many concurrent requests.
- D
Configure the Eventarc trigger to send events to a Pub/Sub topic, and have the Cloud Run service pull from Pub/Sub
This decouples the event source from the consumer, allowing the Cloud Run service to process at its own pace and reducing 429 errors.
Question 269 of 1,000
PDE Ingesting and Processing the Data Practice Question
This PDE practice question tests your understanding of ingesting and processing the data. 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 uses Eventarc to trigger a Cloud Run service when new objects appear in a GCS bucket. Recently, the Cloud Run service has been failing with 429 errors (too many requests) during high-velocity uploads. They need to handle the load without losing events. What should they do?
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
✓
Configure the Eventarc trigger to send events to a Pub/Sub topic, and have the Cloud Run service pull from Pub/Sub
Option D is correct because sending events to a Pub/Sub topic decouples event production from consumption. Pub/Sub acts as a buffer that can absorb spikes in event volume, and the Cloud Run service can pull messages at its own pace, preventing 429 errors. This also ensures no events are lost, as Pub/Sub retains unacknowledged messages and retries delivery.
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 Cloud Functions instead of Cloud Run
Why it's wrong here
Cloud Functions have similar concurrency limits and would likely face the same issue.
- ✗
Increase the maximum number of retries on the Eventarc trigger
Why it's wrong here
Retries help with transient failures but do not prevent 429 errors due to overload.
- ✗
Increase the Cloud Run service's request timeout
Why it's wrong here
Timeout does not affect concurrency handling; the service still gets too many concurrent requests.
- ✓
Configure the Eventarc trigger to send events to a Pub/Sub topic, and have the Cloud Run service pull from Pub/Sub
Why this is correct
This decouples the event source from the consumer, allowing the Cloud Run service to process at its own pace and reducing 429 errors.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the concept of decoupling event sources from consumers using a message queue or buffer, and the trap here is that candidates may think increasing retries or switching to Cloud Functions solves the load issue, when the real need is to absorb bursts via Pub/Sub.
Trap categories for this question
Similar concept trap
Cloud Functions have similar concurrency limits and would likely face the same issue.
Detailed technical explanation
How to think about this question
Under the hood, Eventarc delivers events directly to Cloud Run via HTTP push, which can cause the service to receive bursts of requests exceeding its concurrency setting (default 80). Pub/Sub's pull subscription allows the Cloud Run service to control the rate of message processing via flow control settings (e.g., max outstanding messages). This pattern is commonly used in event-driven architectures to handle traffic spikes without data loss, as Pub/Sub retains messages for up to 7 days.
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.
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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Ingesting and Processing the Data — study guide chapter
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FAQ
Questions learners often ask
What does this PDE question test?
Ingesting and Processing the Data — This question tests Ingesting and Processing the Data — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the Eventarc trigger to send events to a Pub/Sub topic, and have the Cloud Run service pull from Pub/Sub — Option D is correct because sending events to a Pub/Sub topic decouples event production from consumption. Pub/Sub acts as a buffer that can absorb spikes in event volume, and the Cloud Run service can pull messages at its own pace, preventing 429 errors. This also ensures no events are lost, as Pub/Sub retains unacknowledged messages and retries delivery.
What should I do if I get this PDE 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.
About these practice questions
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Last reviewed: Jul 4, 2026
This PDE practice question is part of Courseiva's free Google Cloud certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the PDE exam.
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