[Solved] You are designing a scalable notification system for state changes in a... Which design choice best supports efficient notifications to thousands of subscribers without blocking the main process? | LLD

LLD - Design — Online Shopping Cart

You are designing a scalable notification system for state changes in a distributed application. Which design choice best supports efficient notifications to thousands of subscribers without blocking the main process?

AUse asynchronous message queues to dispatch notifications

BNotify all subscribers synchronously in a loop

CStore notifications in a database and poll subscribers

DSend notifications only when the system restarts

Step-by-Step Solution

Solution:

Step 1: Understand scalability needs
Thousands of subscribers require non-blocking, efficient notification delivery.
Step 2: Evaluate design options
Synchronous loops block main process; polling adds delay; restart notifications are impractical.
Step 3: Identify best practice
Asynchronous message queues decouple notification sending, allowing scalable, fast delivery.
Final Answer:
Use asynchronous message queues to dispatch notifications -> Option A
Quick Check:
Async queues = scalable notifications [OK]

Quick Trick: Async queues handle many subscribers efficiently [OK]

Common Mistakes:

Using synchronous loops causing delays
Relying on polling which is slow
Sending notifications only on restart

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Which design choice best supports efficient notifications to thousands of subscribers without blocking the main process?

Step 1: Understand scalability needs

Step 2: Evaluate design options

Step 3: Identify best practice

Final Answer:

Quick Check:

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