Apache HTTP Server Version 2.3

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# Apache Module mod_lbmethod_bytraffic

Available Languages: en

Description: | Weighted Traffic Counting load balancer scheduler algorithm for `mod_proxy_balancer`
Status: | Extension
Module Identifier: | lbmethod_bytraffic_module
Source File: | mod_lbmethod_bytraffic.c
Compatibility: | Split off from `mod_proxy_balancer` in 2.3

### Summary

This document is still under development.

### Directives

This module provides no directives.

### Topics

- Weighted Traffic Counting Algorithm

### See also

- `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.

Available Languages: en