Apache Module mod_proxy_balancer

Newly added features in Apache 2.1, it is actually additional modules that work with mod_proxy. Both modules must be exist in the server to get the ability of load balancing for proxy server, it support FTP, HTTP protocols. There are two load balancer scheduler algorithm.


1.Request Counting Algorithm
According to Apache Documentation, The idea behind this scheduler is that the load balancer will keep tracking on the client request make sure each gets the equal amount of requests.

2.Weighted Traffic Counting Algorithm
According to Apache Documention,the idea behind this scheduler is very similar to the Request Counting method, This is also a normalized value representing their "share" of the amount of work to be done, but instead of simply counting the number of requests, we take into account the amount of traffic this worker has seen.

References:
1. Apache Module mod_proxy_balancer
http://httpd.apache.org/docs/2.2/mod/mod_proxy_balancer.html