What are some variants of Round-Robin Load Balancing algorithm?

Round-Robin Load Balancing is a straightforward and widely used algorithm for distributing client requests across a set of servers. However, there are several variants of the Round-Robin algorithm that aim to address its limitations and improve its performance in different scenarios. Here are some notable variants:

1. Weighted Round-Robin (WRR)

Weighted Round-Robin assigns a weight to each server based on its capacity or performance capabilities. Servers with higher weights receive more requests compared to those with lower weights. This method ensures that more powerful servers handle a larger share of the load, improving overall efficiency[1][5][6].

2. Dynamic Weighted Round-Robin (DWRR)

Dynamic Weighted Round-Robin extends the WRR by dynamically adjusting the weights based on real-time performance metrics of the servers. This allows the load balancer to adapt to changes in server performance over time, ensuring optimal distribution of requests even as server conditions fluctuate[3][5].

3. Least Connections

While not a direct variant of Round-Robin, Least Connections is often compared to it. This algorithm directs incoming requests to the server with the fewest active connections. It is particularly effective in environments where the load varies significantly between requests, as it ensures that no single server becomes a bottleneck[3][4].

4. Least Response Time

Similar to Least Connections, the Least Response Time algorithm sends requests to the server with the fastest response time. This method is useful for optimizing latency and ensuring that requests are handled as quickly as possible[4].

5. Power of Two Random Choices

This algorithm selects two servers at random and assigns the request to the one with the fewer con...