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