LOAD-BALANCING<\/a> is a fundamental component of modern API<\/a> infrastructure. It acts as a reverse proxy that distributes client requests across multiple backend SERVERS<\/a>. This process prevents any single server from becoming a bottleneck, thereby enhancing the PERFORMANCE<\/a> and reliability of the service. According to documentation by F5 Networks<\/a>, load balancers are essential for managing traffic spikes and ensuring seamless user experiences.<\/p> To determine where to send traffic, LOAD-BALANCING<\/a> systems use various algorithms. Round Robin<\/strong> rotates requests sequentially, while Least Connections<\/strong> directs traffic to the server with the fewest active sessions. More advanced methods like IP Hash<\/strong> use the client's IP address to ensure session persistence. Software solutions like HAPROXY<\/a> or NGINX<\/a> allow for fine-tuned control over these distribution methods.<\/p> A critical feature of LOAD-BALANCING<\/a> is the ability to perform health checks. The balancer regularly polls backend instances to ensure they are responsive. If a server fails, the load balancer automatically redirects traffic to healthy nodes, a process known as FAILOVER<\/a>. This is a cornerstone of HIGH-AVAILABILITY<\/a> architectures as described by Microsoft Azure<\/a>. By decoupling the client from the server instances, LOAD-BALANCING<\/a> facilitates horizontal SCALABILITY<\/a> without service interruption.<\/p>Common Algorithms<\/h2>
Health Checks and Failover<\/h2>