ExpertMedium1 markMultiple Choice
GCP ACE · Question 26 · Domain 3.3: Deploying Cloud Run and Cloud Functions
You are writing a Cloud Function that needs to process messages as soon as they are published to a Cloud Pub/Sub topic named order-events.
How should you configure the Cloud Function to achieve this?
You are writing a Cloud Function that needs to process messages as soon as they are published to a Cloud Pub/Sub topic named order-events.
How should you configure the Cloud Function to achieve this?
Answer options:
A.
Deploy the function with an Eventarc trigger (or --trigger-topic) pointing to the Pub/Sub topic.
B.
Deploy the function with an HTTP trigger and configure Pub/Sub to send a webhook to the URL.
C.
Use Cloud Scheduler to trigger the function every minute to pull messages from the topic.
D.
Write a loop inside the Cloud Function that continuously polls the Pub/Sub topic.
How to approach this question
Recognize the native event-driven capabilities of Cloud Functions. They can be directly triggered by GCP events.
Full Answer
A.Deploy the function with an Eventarc trigger (or --trigger-topic) pointing to the Pub/Sub topic.✓ Correct
Deploy the function with an Eventarc trigger (or --trigger-topic) pointing to the Pub/Sub topic.
Cloud Functions can be triggered directly by Google Cloud events. To process Pub/Sub messages, you deploy the function as a background/event-driven function and specify the Pub/Sub topic as the trigger (using Eventarc in 2nd gen, or `--trigger-topic` in 1st gen). The function will automatically execute every time a new message is published.
Common mistakes
Choosing polling mechanisms (Cloud Scheduler or loops) which defeat the purpose of event-driven serverless architecture.
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