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<div class="blog_content">
<div class="iteye-blog-content-contain">
[![Build Status](https://travis-ci.com/alibaba/canal.svg?branch=master)](https://travis-ci.com/alibaba/canal)
![maven](https://img.shields.io/maven-central/v/com.alibaba.otter/canal.svg)
![license](https://img.shields.io/github/license/alibaba/canal.svg)
[![Average time to resolve an issue](http://isitmaintained.com/badge/resolution/alibaba/canal.svg)](http://isitmaintained.com/project/alibaba/canal "Average time to resolve an issue")
[![Percentage of issues still open](http://isitmaintained.com/badge/open/alibaba/canal.svg)](http://isitmaintained.com/project/alibaba/canal "Percentage of issues still open")
<h1>背景</h1>
<p style="font-size: 14px;"> 早期，阿里巴巴B2B公司因为存在杭州和美国双机房部署，存在跨机房同步的业务需求。不过早期的数据库同步业务，主要是基于trigger的方式获取增量变更，不过从2010年开始，阿里系公司开始逐步的尝试基于数据库的日志解析，获取增量变更进行同步，由此衍生出了增量订阅&amp;消费的业务，从此开启了一段新纪元。</p>
<p style="font-size: 14px;"> ps. 目前内部版本已经支持mysql和oracle部分版本的日志解析，当前的canal开源版本支持5.7及以下的版本(阿里内部mysql 5.7.13, 5.6.10, mysql 5.5.18和5.1.40/48)</p>