LLD - Design — Library Management System
Given a notification system where users can receive notifications via email or SMS, what will be the output if a user prefers SMS but the SMS service is down?
Given a notification system where users can receive notifications via email or SMS, what will be the output if a user prefers SMS but the SMS service is down?
medium📝 Analysis Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand fallback and retry mechanisms
When a preferred channel is down, systems usually queue notifications for retry instead of discarding or failing.Step 2: Analyze options for best practice
Automatic fallback to email requires explicit configuration; silent discard or system stop are poor practices.Final Answer:
Notification is queued and retried later -> Option BQuick Check:
Service down handling = Retry queue [OK]
Quick Trick: Retry notifications if preferred channel fails [OK]
Common Mistakes:
MISTAKES- Assuming automatic fallback without config
- Thinking system stops on failure
- Ignoring retry mechanisms
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