Microservices - Event-Driven Architecture
A developer wrote this event-driven code snippet:
```javascript
messageBroker.publish('userCreated', userData);
messageBroker.publish('userCreated', userData);
```
What is a potential problem here?
A developer wrote this event-driven code snippet: ```javascript messageBroker.publish('userCreated', userData); messageBroker.publish('userCreated', userData); ``` What is a potential problem here?
medium📝 Analysis Q7 of 15
Step-by-Step Solution
Solution:
Step 1: Understand event publishing behavior
Publishing the same event twice can cause duplicate processing if consumers do not handle idempotency.Step 2: Analyze options
Event publishing is asynchronous and does not require callbacks; publishing twice is allowed but may cause duplicates.Final Answer:
Duplicate events may cause repeated processing -> Option BQuick Check:
Duplicate events risk repeated processing = C [OK]
Quick Trick: Duplicate events can cause repeated work [OK]
Common Mistakes:
MISTAKES- Assuming publish is synchronous
- Thinking callbacks are mandatory
- Believing event names must be unique per publish
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