Tag Archives: value 排序

[转 ]Hadoop – How to do a secondary sort on values ?

关于在hadoop中,如何让reduce阶段同一个key下的values有序,一篇很好的文章,写的比《Hadoop权威指南》清楚!

转载自:

http://www.bigdataspeak.com/2013/02/hadoop-how-to-do-secondary-sort-on_25.html

The problem at hand here is that you need to work upon a sorted values set in your reducer.[……]

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