Can you explain client-side versus server-side load balancing in microservices?

Short answer: Client-Side Load Balancing: In client-side load balancing, the client is responsible for selecting the appropriate instance of a service to send the request to, based on the list of available instances.

Explain a bit more

The client usually obtains the list of service instances through service discovery (e.g., Consul, Eureka, Kubernetes DNS). Pros: More control for the client on load balancing strategies (e.g., round-robin, least connections). Reduces pressure on centralized load balancers. Cons: Adds complexity to client-side logic. Requires the client to maintain a list of available instances. Server-Side Load Balancing: In server-side load balancing, a centralized load balancer (e.g., NGINX, HAProxy, Kubernetes ingress controller) is responsible for distributing the traffic to available service instances. Pros: Simpler client-side logic. Centralized control over load balancing logic and configuration. Cons: Can introduce a bottleneck or single point of failure. Requires more resources and maintenance for the load balancer itself.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.