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Add a new blog #239

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Add a new blog #239

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add a new blog
siyu-hu Jun 19, 2019
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fix links and pictures
siyu-hu Jun 19, 2019
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fix some typos
siyu-hu Jun 19, 2019
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fix some typos
siyu-hu Jun 19, 2019
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Update dm-source-code-reading-8.md
siyu-hu Jun 19, 2019
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Update dm-source-code-reading-8.md
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Merge branch 'add-a-new-blog-0619' of https://github.com/pingcap/blog…
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Update dm-source-code-reading-8.md 
Co-Authored-By: Ian <[email protected]>
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@siyu-hu @IANTHEREAL
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Expand Up @@ -9,7 +9,7 @@ tags: ['DM 源码阅读','社区']

本文为 DM 源码阅读系列文章的第八篇，[上篇文章](https://pingcap.com/blog-cn/dm-source-code-reading-7/) 对 DM 中的定制化数据同步功能进行详细的讲解，包括库表路由（Table routing）、黑白名单（Black & white table lists）、列值转化（Column mapping）、binlog 过滤（Binlog event filter）四个主要功能的实现。

本篇文章将会以 gh-ost 为例，详细地介绍 DM 是如何支持一些第三方的 online schema change 方案同步，内容包括 online schema change 方案的简单介绍，online schema change 同步方案，以及同步实现细节。
本篇文章将会以 gh-ost 为例，详细地介绍 DM 是如何支持一些 MySQL 上的第三方 online schema change 方案同步，内容包括 online schema change 方案的简单介绍，online schema change 同步方案，以及同步实现细节。

## MySQL 的 Online Schema Change 方案

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