Mod cluster

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mod_cluster is an httpd-based load balancer. Like mod_jk and mod_proxy, mod_cluster uses a communication channel to forward requests from httpd to one of a set of application server nodes. Unlike mod_jk and mod_proxy, mod_cluster leverages an additional connection between the application server nodes and httpd to transmit server-side load balance factors and lifecycle events back to httpd.

mod_cluster has two parts: a native component that plugs into Apache httpd and provides load balancing services to multiple Tomcat back-end nodes.