# Context aware MySQL pools via HAProxy

- **期号**: SRE Weekly Issue #36（2016-08-21）
- **作者**: Thanks to Devops Weekly for this one.
- **链接**: http://githubengineering.com/context-aware-mysql-pools-via-haproxy/

## 简介

Github uses HAProxy to balance across is read-only MySQL replicas, which is a common method.  Their technique for excluding lagging nodes while avoiding entirely emptying the pool if all nodes are lagging is pretty neat.

## 正文

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