Kafka - Event-Driven Architecture
You notice that your Saga implementation using Kafka sometimes processes compensation events before the original transaction events. What is the likely cause?
You notice that your Saga implementation using Kafka sometimes processes compensation events before the original transaction events. What is the likely cause?
medium📝 Debug Q6 of 15
Step-by-Step Solution
Solution:
Step 1: Analyze message ordering in Kafka
Kafka guarantees order only within partitions keyed by the same key.Step 2: Cause of out-of-order compensation
If messages are not keyed by transaction ID, they may go to different partitions and be processed out of order.Final Answer:
Kafka topic partitions are not keyed by transaction ID, causing out-of-order processing. -> Option BQuick Check:
Out-of-order events = wrong partition key [OK]
Quick Trick: Use transaction ID as key to maintain order [OK]
Common Mistakes:
MISTAKES- Assuming Kafka reorders messages randomly
- Blaming consumer group size
- Thinking different clusters cause ordering issues
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