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# 通过 HAProxy 实现上下文感知的 MySQL 连接池
- **期号**: SRE Weekly Issue #36(2016-08-21)
- **作者**: 感谢 Devops Weekly 推荐本篇。
- **链接**: http://githubengineering.com/context-aware-mysql-pools-via-haproxy/
## 简介
GitHub 用 HAProxy 在其只读 MySQL 副本之间做负载均衡,这很常见。巧妙的是他们剔除滞后节点的技巧:既能排除复制延迟过大的节点,又能在所有节点都滞后时避免把整个连接池清空。
## 正文
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