mod_lbmethod_bybusyness - Apache HTTP Server Version 2.4









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Apache HTTP Server Version 2.4



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Apache Module mod_lbmethod_bybusyness

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Description:Pending Request Counting load balancer scheduler algorithm for mod_proxy_balancer
Status:Extension
Module Identifier:lbmethod_bybusyness_module
Source File:mod_lbmethod_bybusyness.c
Compatibility:Split off from mod_proxy_balancer in 2.3
Summary

This module does not provide any configuration directives of its own.
It requires the services of mod_proxy_balancer, and
provides the bybusyness load balancing method.

Topics

 Pending Request Counting Algorithm
Directives
This module provides no
            directives.
Bugfix checklisthttpd changelogKnown issuesReport a bugSee also

mod_proxy
mod_proxy_balancer
Comments


Pending Request Counting Algorithm

    

    Enabled via lbmethod=bybusyness, this scheduler keeps
    track of how many requests each worker is currently assigned at present. A new
    request is automatically assigned to the worker with the lowest
    number of active requests. This is useful in the case of workers
    that queue incoming requests independently of Apache, to ensure that
    queue length stays even and a request is always given to the worker
    most likely to service it the fastest and reduce latency.

    In the case of multiple least-busy workers, the statistics (and
    weightings) used by the Request Counting method are used to break the
    tie. Over time, the distribution of work will come to resemble that
    characteristic of byrequests (as implemented
    by mod_lbmethod_byrequests).




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