mongodb中的Mapreduce [英] Mapreduce in mongodb

问题描述

我想知道mongodb中的map reduce作业是否与Hadoop有关. Mongodb中的Mapreduce是独立的，不依赖任何hadoop安装吗?如果我猜测是正确的，那么两者之间的map reduce语法是相同的，或者仅表示mongodb支持自己的map reduce(具有不同的语法)?

I am wondering whether map reduce job in mongodb has anything to do with Hadoop. Mapreduce in Mongodb is a standalone and no dependency on any hadoop installation? If what I am guessing is correct, then the map reduce syntax is the same between the two or it just means that mongodb is supporting its own map reduce (with different syntax)?

推荐答案

Map Reduce在mongodb中并不是执行临时查询的最快接口，它更适合于后台作业，创建报告等.在我的博客上

Map Reduce is not fastest interface in mongodb to do ad hoc queries it is more designed for background jobs, creating reports etc. I wrote some time ago how to do it on my blog

http://no -fucking-idea.com/blog/2012/04/01/using-map-reduce-with-mongodb/

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