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What is a Load Balancer?

Disclaimer: This is a personal summary and interpretation based on a YouTube video. It is not official material and not endorsed by the original creator. All rights remain with the respective creators.

This document summarizes the key takeaways from the video. I highly recommend watching the full video for visual context and coding demonstrations.

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Introduction to Load Balancers

Load balancers handle traffic for high-traffic websites by distributing requests across multiple servers to prevent any single one from getting overwhelmed. Key takeaway: For a site expecting millions of users, a load balancer sits between the internet and your app servers, routing traffic intelligently. Ask AI: Introduction to Load Balancers

Scaling Application Servers

When one app server can't handle the load from thousands of users, scale horizontally by adding more servers instead of making one bigger. Key takeaway: Limits exist on vertical scaling, so horizontal scaling with multiple app servers ensures the site can serve concurrent users without saturation. Ask AI: Scaling Application Servers

Role and Functions of a Load Balancer

A load balancer intercepts incoming traffic, distributes it to app servers, monitors their utilization, and enables auto-scaling to add or remove servers based on load. Key takeaway: App servers report their status to the balancer, which can spin up new ones at high utilization (e.g., 85-90%) or shut down idle ones to cut costs, while all servers connect to a shared database to avoid data inconsistencies. Ask AI: Role and Functions of a Load Balancer

Load Balancing Algorithms: Round Robin

Round robin assigns traffic sequentially to each app server in a cycle, like user 1 to server 1, user 2 to server 2, and so on, restarting after the last one. Key takeaway: It's simple but can lead to imbalances if session lengths vary, with some servers overloaded while others are underused. Ask AI: Load Balancing Algorithms: Round Robin

Load Balancing Algorithms: Smart Load Balancing

Smart balancing monitors app server loads in real-time and routes new connections to the least busy server. Key takeaway: Servers communicate their utilization to the balancer, making it more effective but requiring more setup and potentially higher costs than basic methods. Ask AI: Load Balancing Algorithms: Smart Load Balancing

Load Balancing Algorithms: Other Methods

Beyond round robin and smart balancing, options like random selection distribute traffic unpredictably to avoid patterns, with about nine algorithms available to balance simplicity and control. Key takeaway: Random assign mixes things up without full monitoring, offering a middle ground for scenarios needing more than sequential routing but less complexity than load-aware setups. Ask AI: Load Balancing Algorithms: Other Methods

About the summarizer

I'm Ali Sol, a Backend Developer. Learn more: