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# 用 freno 缓解复制延迟、降低读负载
- **期号**: SRE Weekly Issue #93(2017-10-15)
- **作者**: —
- **链接**: https://githubengineering.com/mitigating-replication-lag-and-reducing-read-load-with-freno/
## 简介
GitHub 通过根据副本延迟对昂贵的批处理查询做限流,来保证 MySQL 复制延迟保持在低位。在 freno 出现之前,这套逻辑分散在每一个客户端里,并且用不同语言实现了多个版本。freno(开源)把副本延迟轮询和查询限流决策集中到了一个可查询的服务中。
## 正文
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