- A
Upload the video and synchronously wait for transcoding to complete before responding
Why wrong: Synchronous processing requires the user to wait 5–30 minutes — a poor user experience and a connection timeout risk.
- B
Publish a transcoding job to Cloud Pub/Sub after upload; respond immediately; workers consume and process jobs asynchronously
The user gets an instant acknowledgment. Cloud Pub/Sub buffers the jobs. Autoscaling workers consume messages and transcode — decoupled, scalable, and burst-tolerant.
- C
Use Cloud Spanner to store video metadata and transcode synchronously in a Cloud SQL stored procedure
Why wrong: Database stored procedures are not designed for video transcoding — this is the wrong architecture for media processing.
- D
Deploy the transcoding directly in the API server and scale the API server horizontally for bursts
Why wrong: Running transcoding in the API server blocks API threads, consumes excessive API server resources, and creates a poor user experience during burst uploads.
Quick Answer
The answer is to publish a transcoding job to Cloud Pub/Sub after upload, respond immediately, and have workers consume and process jobs asynchronously. This architecture is correct because it decouples the upload from the transcoding process using Cloud Pub/Sub, allowing the API to return an instant response to the user while workers handle the 5–30 minute transcoding tasks in the background. The pub/sub model inherently handles burst uploads by buffering messages, ensuring no video is lost even under sudden spikes in demand, and workers can scale independently to match the queue depth. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of asynchronous processing patterns and decoupling services, often appearing as a trap where candidates mistakenly choose synchronous solutions like Cloud Functions with direct invocation. A key memory tip: think “fire and forget” for uploads, and remember that Pub/Sub acts as a shock absorber for bursts.
Google ACE Planning and configuring a cloud solution Practice Question
This ACE practice question tests your understanding of planning and configuring a cloud solution. 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 startup processes uploaded videos — each video upload triggers transcoding that takes 5–30 minutes. Users should get an immediate response after upload, not wait for transcoding. The transcoding system must handle burst uploads. Which architecture fits?
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
Publish a transcoding job to Cloud Pub/Sub after upload; respond immediately; workers consume and process jobs asynchronously
Option B is correct because it decouples the upload from the transcoding process using Cloud Pub/Sub, allowing the API to respond immediately to the user while workers asynchronously process the transcoding jobs. This pattern handles burst uploads by buffering messages in Pub/Sub and scaling workers independently, ensuring no upload is lost even under high load.
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.
- ✗
Upload the video and synchronously wait for transcoding to complete before responding
Why it's wrong here
Synchronous processing requires the user to wait 5–30 minutes — a poor user experience and a connection timeout risk.
- ✓
Publish a transcoding job to Cloud Pub/Sub after upload; respond immediately; workers consume and process jobs asynchronously
Why this is correct
The user gets an instant acknowledgment. Cloud Pub/Sub buffers the jobs. Autoscaling workers consume messages and transcode — decoupled, scalable, and burst-tolerant.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Use Cloud Spanner to store video metadata and transcode synchronously in a Cloud SQL stored procedure
Why it's wrong here
Database stored procedures are not designed for video transcoding — this is the wrong architecture for media processing.
- ✗
Deploy the transcoding directly in the API server and scale the API server horizontally for bursts
Why it's wrong here
Running transcoding in the API server blocks API threads, consumes excessive API server resources, and creates a poor user experience during burst uploads.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that synchronous processing or scaling the API server alone can handle long-running tasks, but the trap here is that immediate response and burst handling require asynchronous decoupling via a message queue like Pub/Sub, not just horizontal scaling.
Detailed technical explanation
How to think about this question
Cloud Pub/Sub provides at-least-once delivery and can buffer millions of messages, making it ideal for bursty workloads like video uploads. Workers can be implemented as Cloud Run services or Compute Engine instances that pull messages from a subscription, process the video using tools like FFmpeg, and store the result in Cloud Storage. The key subtlety is that Pub/Sub’s acknowledgment deadline (default 10 seconds, extendable up to 600 seconds) must be configured correctly for long-running transcoding jobs to avoid message redelivery.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
What to study next
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FAQ
Questions learners often ask
What does this ACE question test?
Planning and configuring a cloud solution — This question tests Planning and configuring a cloud solution — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Publish a transcoding job to Cloud Pub/Sub after upload; respond immediately; workers consume and process jobs asynchronously — Option B is correct because it decouples the upload from the transcoding process using Cloud Pub/Sub, allowing the API to respond immediately to the user while workers asynchronously process the transcoding jobs. This pattern handles burst uploads by buffering messages in Pub/Sub and scaling workers independently, ensuring no upload is lost even under high load.
What should I do if I get this ACE 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: Jun 30, 2026
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