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agapple
2013-02-19 02:54:09 -08:00
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<p style="font-size: 14px;"> 定位： 基于数据库增量日志解析，提供增量数据订阅&amp;消费，目前主要支持了mysql</p>
<p style="font-size: 14px;"> </p>
<h2>工作原理</h2>
<h3 style="font-size: 14px;">mysql主备复制实现</h3>
<p><img src="http://dl.iteye.com/upload/attachment/0080/3086/468c1a14-e7ad-3290-9d3d-44ac501a7227.jpg" alt=""><br> 从上层来看，复制分成三步：</p>
<ol>
<li>master将改变记录到二进制日志(binary log)中（这些记录叫做二进制日志事件，binary log events，可以通过show binlog events进行查看）；</li>
<li>slave将master的binary log events拷贝到它的中继日志(relay log)；</li>
<li>slave重做中继日志中的事件，将改变反映它自己的数据。</li>
</ol>
<h3>canal的工作原理：</h3>
<p><img width="590" src="http://dl.iteye.com/upload/attachment/0080/3107/c87b67ba-394c-3086-9577-9db05be04c95.jpg" alt="" height="273"></p>
<p>原理相对比较简单：</p>
<ol>