# OnlineSchemaChange rebuilt in Python

- **期号**: SRE Weekly Issue #71（2017-05-07）
- **作者**: —
- **链接**: https://code.facebook.com/posts/1290069194423954/onlineschemachange-rebuilt-in-python/

## 简介

Facebook rewrote their tool, OnlineSchemaChange in Python (from the original PHP). OSC is a tool for doing DDL in MySQL without downtime.

> The original open sourced OSC was more like an engine than a tool. Users needed to write PHP code wrapping to run the schema change, and, with PHP becoming less popular in the operations world, OSC.php wasn’t widely adopted by the community.

## 正文

> ⚠️ 抓取失败：HTTP 400