Commit 015d80e6 authored by Andre Malo's avatar Andre Malo
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update transformation 


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@106727 13f79535-47bb-0310-9956-ffa450edef68
parent 8b23eb99

docs/manual/mod/mod_proxy_balancer.html.en

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@@ -62,149 +62,110 @@ load balancing </td></tr> 
<h2><a name="scheduler" id="scheduler">Load balancer scheduler algorithm</a></h2>

    

    <p>The idea behind this scheduler is the following:</p>

    <p><strong>lbfactor</strong> is <em>how much we expect this worker



    <p><dfn>lbfactor</dfn> is <em>how much we expect this worker

    to work</em>, or <em>the workers's work quota</em>.</p>

    <p><strong>lbstatus</strong> is <em>how urgent this worker has to work



    <p><dfn>lbstatus</dfn> is <em>how urgent this worker has to work

    to fulfill its quota of work</em>.</p>

    <p>The <strong>worker</strong> is a member of the load balancer,

    usually a remote host serving one of the supported protocols</p> 



    <p>The <dfn>worker</dfn> is a member of the load balancer,

    usually a remote host serving one of the supported protocols.</p>



    <p>We distribute each worker's work quota to the worker, and then look

    which of them needs to work most urgently (biggest lbstatus).  This

    worker is then selected for work, and its lbstatus reduced by the

    total work quota we distributed to all workers.  Thus the sum of all

    lbstatus does not change.(*)</p>



    <p>If some workers are disabled, the others will

    still be scheduled correctly.</p>



    <p>If a balancer is configured as follows:</p>

    

    <table><tr><th>worker</th>

        <th class="data">a</th>

        <th class="data">b</th>

        <th class="data">c</th>

        <th class="data">d</th></tr>

<tr><th>lbfactor</th>

        <td class="data">25</td>

        <td class="data">25</td>

        <td class="data">25</td>

        <td class="data">25</td></tr>

<tr><th>lbstatus</th>

        <td class="data">0</td>

        <td class="data">0</td>

        <td class="data">0</td>

        <td class="data">0</td></tr>

</table>



<code>

  <table>

    <tr>

        <td width="80">worker</td>

        <td width="30" style="text-align: right;">a</td>

        <td width="30" style="text-align: right;">b</td>

        <td width="30" style="text-align: right;">c</td>

        <td width="30" style="text-align: right;">d</td>

    </tr>

    <tr>

        <td>lbfactor</td>

        <td style="text-align: right;">25</td>

        <td style="text-align: right;">25</td>

        <td style="text-align: right;">25</td>

        <td style="text-align: right;">25</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

    </tr>

    <p>And <var>b</var> gets disabled, the following schedule is produced:</p>



    <table><tr><th>worker</th>

        <th class="data">a</th>

        <th class="data">b</th>

        <th class="data">c</th>

        <th class="data">d</th></tr>

<tr><th>lbstatus</th>

        <td class="data">-50</td>

        <td class="data">0</td>

        <td class="data">25</td>

        <td class="data">25</td></tr>

<tr><th>lbstatus</th>

        <td class="data">-25</td>

        <td class="data">0</td>

        <td class="data">-25</td>

        <td class="data">50</td></tr>

<tr><th>lbstatus</th>

        <td class="data">0</td>

        <td class="data">0</td>

        <td class="data">0</td>

        <td class="data">0</td></tr>

<tr><td class="data" colspan="5">(repeat)</td></tr>

</table>

</code>    

    <p>And b gets disabled, the following schedule is produced:</p>

<code>

  <table>

    <tr>

        <td width="80">lbstatus</td>

        <td width="30" style="text-align: right;">-50</td>

        <td width="30" style="text-align: right;">0</td>

        <td width="30" style="text-align: right;">25</td>

        <td width="30" style="text-align: right;">25</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">-25</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">-25</td>

        <td style="text-align: right;">50</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

    </tr>

    <tr>

        <td colspan="5">(repeat)</td>

    </tr>

  </table>

</code>



    <p>That is it schedules: a c d a c d a c d ...</p>

    <p>The following asymmetric configuration works as one would expect:</p>

<code>

  <table>

    <tr>

        <td width="80">worker</td>

        <td width="30" style="text-align: right;">a</td>

        <td width="30" style="text-align: right;">b</td>

    </tr>

    <tr>

        <td>lbfactor</td>

        <td style="text-align: right;">70</td>

        <td style="text-align: right;">30</td>

    </tr>

    <tr>

        <td colspan="3">&nbsp;</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">-30</td>

        <td style="text-align: right;">30</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">40</td>

        <td style="text-align: right;">-40</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">10</td>

        <td style="text-align: right;">-10</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">-20</td>

        <td style="text-align: right;">20</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">-50</td>

        <td style="text-align: right;">50</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">20</td>

        <td style="text-align: right;">-20</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">-10</td>

        <td style="text-align: right;">10</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">-40</td>

        <td style="text-align: right;">40</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">30</td>

        <td style="text-align: right;">-30</td>

    </tr>

    <tr>

        <td>lbstatus</td>

        <td style="text-align: right;">0</td>

        <td style="text-align: right;">0</td>

    </tr>

    <tr>

        <td colspan="3">(repeat)</td>

    </tr>



    <table><tr><th>worker</th>

        <th class="data">a</th>

        <th class="data">b</th></tr>

<tr><th>lbfactor</th>

        <td class="data">70</td>

        <td class="data">30</td></tr>

<tr><th>lbstatus</th>

        <td class="data">-30</td>

        <td class="data">30</td></tr>

<tr><th>lbstatus</th>

        <td class="data">40</td>

        <td class="data">-40</td></tr>

<tr><th>lbstatus</th>

        <td class="data">10</td>

        <td class="data">-10</td></tr>

<tr><th>lbstatus</th>

        <td class="data">-20</td>

        <td class="data">20</td></tr>

<tr><th>lbstatus</th>

        <td class="data">-50</td>

        <td class="data">50</td></tr>

<tr><th>lbstatus</th>

        <td class="data">20</td>

        <td class="data">-20</td></tr>

<tr><th>lbstatus</th>

        <td class="data">-10</td>

        <td class="data">10</td></tr>

<tr><th>lbstatus</th>

        <td class="data">-40</td>

        <td class="data">40</td></tr>

<tr><th>lbstatus</th>

        <td class="data">30</td>

        <td class="data">-30</td></tr>

<tr><th>lbstatus</th>

        <td class="data">0</td>

        <td class="data">0</td></tr>

<tr><td class="data" colspan="3">(repeat)</td></tr>

</table>

</code>



    <p>That is after 10 schedules, the schedule repeats and 7 a are selected

    with 3 b interspersed.</p>

docs/manual/mod/mod_proxy_balancer.html.ja.euc-jp

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<p><span>Available Languages: </span><a href="../en/mod/mod_proxy_balancer.html" hreflang="en" rel="alternate" title="English">&nbsp;en&nbsp;</a> |

<a href="../ja/mod/mod_proxy_balancer.html" title="Japanese">&nbsp;ja&nbsp;</a></p>

</div>

<div class="outofdate">This translation may be out of date. Check the

            English version for recent changes.</div>

<table class="module"><tr><th><a href="module-dict.html#Description">説明:</a></th><td>負荷分散のための <code class="module"><a href="../mod/mod_proxy.html">mod_proxy</a></code> 拡張</td></tr>

<tr><th><a href="module-dict.html#Status">ステータス:</a></th><td>Extension</td></tr>

<tr><th><a href="module-dict.html#ModuleIdentifier">モジュール識別子:</a></th><td>proxy_balancer_module</td></tr>

docs/manual/mod/mod_proxy_balancer.xml.ja

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<?xml version="1.0" encoding="iso-2022-jp"?>

<!DOCTYPE modulesynopsis SYSTEM "../style/modulesynopsis.dtd">

<?xml-stylesheet type="text/xsl" href="../style/manual.ja.xsl"?>

<!-- English Revision: 105989 -->

<!-- English Revision: 105989 (outdated: 106723) -->



<!--

 Copyright 2002-2004 The Apache Software Foundation

docs/manual/mod/mod_proxy_balancer.xml.meta

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    <variant>en</variant>

    <variant>ja</variant>

    <variant outdated="yes">ja</variant>

  </variants>

</metafile>