System Design : Load Balancing | How Load Balancers work

Features of Load Balancer:

• Distribute load/requests across multiple resources/servers.
• Keep track of status of all resources while distributing requests. If a server is down, it stops sending traffic to that server. [depending on activeness of the server]
• Ease of use in adding/removing servers in network based on demand.

Algorithms used for Load Balancing:

1. Round Robin
2. Least Connections
3. Least Response Time
4. IP Hash
5. URL Hash


Where can we use Load Balancers?

• User Requests -- [Load Balancer] -- Web Server
• Web Server --  [Load Balancer] -- Backend Server
• Internal Server -- [Load Balancer] -- Databases

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4 Tips to crack System Design Interview

• Leverage your Existing Knowledge:
• Database Technologies
• Load Balancers
• Message Handlers
• Caching Techniques
• Scaling Techniques

• Understand the Problem very well: (Ask Questions)
• Constraints ?
• Users - Who, How large ?

• High Level Architecture Design (Abstract Design):
• Break problem into Components/Modules
• How the components are connected
• Don't go Deep

• Go Deep into Component of Interest:
• UI
• Database Side
• Caching
• Scalability
• Server

Detailed Explanation can be found on Youtube:

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