http://blog.csdn.net/pipisorry/article/details/49183379
海量数据挖掘Mining Massive Datasets(MMDs) -Jure Leskovec courses学习笔记之流算法Stream Algorithms
Stream Algorithms: "Streams" are data inputs to a system that arrive at a very high rate, typically too fast to do anything significant with each arriving input. Examples include data beamed down from a satellite, or click streams for
a popular Web site. In this model, it is often necessary to accept a less-than-accurate answer to questions such as "how many different items have I seen at least once in this stream?"
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from:http://blog.csdn.net/pipisorry/article/details/49183379