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Hadoop Streaming 实战之aggregate

1. aggregate概述aggregate是Hadoop提供的一个软件包,其用来做一些通用的计算和聚合。Generally speaking, in order to implement an application using Map/Reduce model, the developer needs to implement Map and Reduce functions (and possibly Combine function). However, for a lot of applications related to counting and statistics computing, these functions have very similarcharacteristics
发布时间:2013-10-27 | 类别:技术文章 | 阅读:416817 | 评论:0 | 标签:streaming streaming streaming

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