本文转载自《流式计算》最后一章：《大数据凉了？不，流式计算浪潮才刚刚开始》，链接为： https://www.infoq.cn/article/the-evolution-of-large-scale-data-processing 本文重点讨论了大数据系统发展的历史轨迹，行文轻松活泼，内容通俗易懂，是一篇茶余饭后用来作为大数据谈资的不严肃说明文。本文翻译自《Streaming System》最后

Stream Data is becoming more and more important SGD as an example Problems: Sampling data from a stream Queries over sliding windows APP Question1：Sampling