GCP - Cloud Pub/Sub
What is the likely cause if messages with the same ordering_key arrive out of order in Google Cloud Pub/Sub?
What is the likely cause if messages with the same ordering_key arrive out of order in Google Cloud Pub/Sub?
medium📝 Debug Q14 of 15
Step-by-Step Solution
Solution:
Step 1: Identify ordering requirements
Both publisher and subscriber must support ordering for it to work.Step 2: Analyze cause of disorder
If subscription does not enable ordering, messages may arrive out of order despite ordering_key.Final Answer:
Ordering is not enabled on the subscription -> Option AQuick Check:
Subscription must enable ordering [OK]
Quick Trick: Enable ordering on both publisher and subscriber [OK]
Common Mistakes:
- Blaming message content for order
- Assuming encryption affects order
- Thinking batching breaks ordering
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