mod_log_spread is a patch to mod_log_config to allow logging to multicast groups. It utilizes the group communication toolkit Spread, developed at Johns Hopkins Universitys Center for Networking and Distributed Systems.

mod_log_spread was developed to solve the problem of collecting consolidated access logs for large web farms.

In particular, the solution needed to be scalable to hundreds of machines, utilize a reliable network transport, allow machines to added or dropped on the fly, and impose minimal performance impact on the webservers.