mod_lbmethod_bytraffic
Weighted Traffic Counting load balancer scheduler algorithm for mod_proxy_balancer
Extension
mod_lbmethod_bytraffic.c
lbmethod_bytraffic_module
Split off from mod_proxy_balancer in 2.3

This document is still under development.

mod_proxy
mod_proxy_balancer

# Weighted Traffic Counting Algorithm

Enabled via `lbmethod=bytraffic`, the idea behind this scheduler is very similar to the Request Counting method, with the following changes:

lbfactor is how much traffic, in bytes, we want this worker to handle. 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.

If a balancer is configured as follows:

worker | a | b | c
--- | --- | --- | ---
lbfactor | 1 | 2 | 1

Then we mean that we want b to process twice the amount of bytes than a or c should. It does not necessarily mean that b would handle twice as many requests, but it would process twice the I/O. Thus, the size of the request and response are applied to the weighting and selection algorithm.