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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 #72(2017-05-14)
- **作者**: —
- **链接**: https://thoughts.t37.net/how-we-upgraded-a-22tb-mysql-cluster-from-5-6-to-5-7-in-9-months-cc41b391895d
## 简介
上周我收录了这篇文章,但那时的链接已经过期,返回了 404。这是更正后的链接——抱歉!
## 正文
> ⚠️ 抓取失败:URLError: [SSL: UNEXPECTED_EOF_WHILE_READING] EOF occurred in violation of protocol (_ssl.c:1032)