A developer tries to pull messages but receives none, even though messages were published. What could be the problem?

medium📝 Debug Q7 of 15

GCP - Cloud Pub/Sub

AThe topic has no messages published.

BThe subscriber is using the wrong project ID.

CThe subscription is a push subscription, so pull won't work.

DThe messages were acknowledged automatically.

Step-by-Step Solution

Solution:

Step 1: Understand subscription types and message retrieval
Pulling messages only works with pull subscriptions; push subscriptions deliver automatically.
Step 2: Check other options
Messages were published; wrong project ID would cause errors; messages are not auto-acknowledged.
Final Answer:
The subscription is a push subscription, so pull won't work. -> Option C
Quick Check:
Pull only works with pull subscriptions [OK]

Quick Trick: Pull won't work on push subscriptions [OK]

Common Mistakes:

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