[Solved] You are designing a notification system to alert all parties involved in a project. Which design choice best ensures scalability and reliability?A.... | LLD

LLD - Design — Food Delivery System

You are designing a notification system to alert all parties involved in a project. Which design choice best ensures scalability and reliability?

A. Use a single server to send notifications sequentially to all parties.
B. Send notifications only to a random subset of parties to reduce load.
C. Store all notifications in a database and send them manually when needed.
D. Use a message queue to distribute notification tasks to multiple worker servers.

ASingle server sending sequentially

BMessage queue with multiple workers

CStore notifications and send manually

DSend to random subset to reduce load

Step-by-Step Solution

Solution:

Step 1: Evaluate single server approach
Sending sequentially from one server limits scalability and can cause delays or failures.
Step 2: Consider message queue with workers
Using a message queue allows distributing notification tasks to multiple workers, improving scalability and reliability.
Step 3: Assess other options
Storing notifications for manual sending is slow; sending to random subset misses parties.
Final Answer:
Message queue with multiple workers -> Option B
Quick Check:
Queue + workers = scalable, reliable notifications [OK]

Quick Trick: Use queues and workers for scalable notifications [OK]

Common Mistakes:

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