Kafka - Event-Driven Architecture
In a choreography system, a developer notices that some events are processed multiple times causing duplicate actions. What is the likely cause?
In a choreography system, a developer notices that some events are processed multiple times causing duplicate actions. What is the likely cause?
medium📝 Debug Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Identify cause of duplicate processing
In choreography, duplicate events can cause repeated actions if handlers are not idempotent.Step 2: Eliminate other options
Orchestrator is not used in choreography, topic deletion causes loss not duplicates, direct API calls unrelated.Final Answer:
Lack of idempotency in event handlers. -> Option BQuick Check:
Idempotency prevents duplicate event effects [OK]
Quick Trick: Make event handlers idempotent to avoid duplicates [OK]
Common Mistakes:
MISTAKES- Blaming orchestrator in choreography
- Confusing topic deletion with duplicates
- Ignoring event handler design
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