GCP - Cloud Pub/Sub
Given a Pub/Sub topic with message ordering enabled and messages published with ordering key 'A' in this sequence: M1, M2, M3. If M2 fails to publish, what happens to M3?
Given a Pub/Sub topic with message ordering enabled and messages published with ordering key 'A' in this sequence: M1, M2, M3. If M2 fails to publish, what happens to M3?
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand ordering key behavior
Messages with the same ordering key must be delivered in order.Step 2: Analyze failure impact
If M2 fails, M3 waits until M2 is published to maintain order.Final Answer:
M3 is delayed until M2 is successfully published -> Option BQuick Check:
Ordering key blocks next message on failure [OK]
Quick Trick: Next message waits if previous with same key fails [OK]
Common Mistakes:
- Assuming messages skip failed ones
- Thinking messages with same key arrive out of order
- Believing messages get dropped silently
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