Revision Notes/System Design Concepts
Field Entry - System Design Concepts
Load Balancing
Distributing incoming traffic across multiple servers to prevent any single server from being overwhelmed.
Field Note - Real-world Analogy
“Like multiple checkout lanes in a supermarket. The store manager (load balancer) directs customers (requests) to the available cashier (server). If one lane has a long queue, the manager sends new customers to the shorter one. No single cashier gets overwhelmed, and customers get served faster overall.”
Field Observations - Key Topics Covered
A load balancer sits between clients and your server fleet. Clients send all requests to the load balancer's single IP/domain. The load balancer forwards each request to one of the backend servers and returns the response to the client. The client never knows which server handled it.
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