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全链路压测:影子库与影子表之争
2022-07-06 23:04:00 【InfoQ】
业界盛传的全链路压测是什么
- 单链路压测缺少外部干扰和各种资源竞争,单链路压测的结果普遍比较乐观,不能反映真实的系统承载能力。
- 某些问题只有在真正的大流量下才会暴露,比如网络带宽、系统间影响、基础依赖等等。
- 全链路压测不仅仅是做压测,更多的是进行一次真实的大促预演,预案演练、限流验证、破坏性演练等高可用方案的统一验收。
全链路压测数据隔离方案的选择
方案一:影子库
方案二:影子表
方案对比
性能
- 正常流量:200 并发
- 压测流量:800 并发
稳定性
成本
- 冗余成本
- 数据迁移成本
总结
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