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View Code? Open in Web Editor NEW学习和研究Go的一些代码
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ego008 kingpro xiafish201 honsenoop forging2012 bigdot123456 skhuang1993 luojinqq sakishum dangding tic8 iott lanshuwen newpurr xiaozhou-plus bean-jelly hanyingzhong basetool schooltop bary321 leo-lionni mengdj veetine iefoam huahuayu pengkai242 liuxiansong-ones hsxwd gtyi999go_code's Issues
问题请教
在这个大促的日子聊一聊我的大促经历
在这篇文章里面有
性能
对于性能最重要的指标还是TP99，公司对性能其实有不成文的规定，TP99要小于200ms。如果>> 大于这个值，用户会明显觉得卡顿。
禁止读库、禁止跨机房调用
线上只读服务，比如我们列表服务，禁止直连数据库。用户的任何操作都不能发生数据库操作。平时我们经常会写这种接口：取缓存读数据，没有的话去读库，然后把数据设置到缓存里。这种方案只适用于小流量的情况，一旦数据库来个慢查询或者数据量变大，所有接口都会挂，所有哦。这也算是雪崩的一种吧。
跨机房调用一个是慢，一个是这样的话就失去了双活的意义了。不过我们的降级方案里有跨机房方案，不过常规方案里要禁止。
Q1: 请问下，不直连数据库的话,怎么操作数据？缓存?
Q2:如果是缓存的话，怎么保证事务的一致性?
Q3: 你们用的什么数据库中间件？
Q4: 性能测试的话，用的什么工具?
DNS解析的这个不通用只适合没有cname的
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