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淘宝这类高并发网站都是如何更新生产环境下的源代码？

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Release： 2016-06-06 16:44:00
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比如说发现后端某个地方出现bug，修复之后要部署新的代码文件上去，但是此时此刻还有很多用户的浏览或者交易操作到了一半，更新的话会不会影响他们操作，会不会造成经济之类的损失？他们是如何避免的呢？

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非淘宝员工，问题可以从灰度层面来解决
比如人家有100台服务器，流量切换到其中80台，20台服务器没有访问量，部署最新代码。
观察日志没有问题再这么搞，20台一步一步来，数字只做假设 必须是灰度升级，大公司的发布都是灰度升级，有可能同时会有超过3个版本的业务在运行，但是对于用户来说是无感知的。 分级部署
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