PDE Ingesting and Processing the Data Practice Question
A retail company wants to trigger a Cloud Run service whenever a new CSV file is uploaded to a specific Cloud Storage bucket. Which THREE components are needed to set up this event-driven architecture? (Choose 3)
⚠ Common exam trap
Google often tests the misconception that you must manually create a Pub/Sub topic as a separate component, when in fact Eventarc manages it automatically, making the Pub/Sub topic an implicit part of the Eventarc trigger rather than a distinct required component.
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
✓
Cloud Storage bucket with notifications enabled
Cloud Storage buckets must have notifications enabled to publish events to Pub/Sub when objects are created. Without enabling notifications, the bucket cannot emit events that trigger downstream services. This is typically done by configuring the bucket to send notifications to a Pub/Sub topic for each new object upload.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Cloud Storage bucket with notifications enabled
Why this is correct
The source of events; bucket must be configured to send notifications.
- ✓
Eventarc trigger
Why this is correct
Routes events from Cloud Storage to Cloud Run.
- ✗
Cloud Dataflow pipeline
Why it's wrong here
Not needed for event triggering; could be used for processing but not for the trigger itself.
- ✓
Cloud Run service
Why this is correct
The target service that processes the file.
- ✗
Cloud Pub/Sub topic
Why it's wrong here
Eventarc manages Pub/Sub internally; user does not need to create a topic.
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