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# 我们如何用 9 个月把 22TB 的 MySQL 集群从 5.6 升级到 5.7
- **期号**: SRE Weekly Issue #71(2017-05-07)
- **作者**: —
- **链接**: https://thoughts.t37.net/how-we-upgraded-a-22tb-mysql-cluster-from-5-6-to-5-7-in-9-months-b09211af57ba
## 简介
这个故事里最有意思的一点是:升级到 5.7 要求任何含时间相关列的表都必须做全表重写(`ALTER TABLE`)。他们最初的试运行跑了几个月都没跑完。
## 正文
> ⚠️ 抓取失败:URLError: [SSL: UNEXPECTED_EOF_WHILE_READING] EOF occurred in violation of protocol (_ssl.c:1032)