Hadoop map-reduce的基本过程

Leave a Comment / Architecture / October 29, 2012

摘自Hadoop-The Definitive Guide, 稍微添加了一两条线

只有一个Reduce Task

有多个Reduce Task

注意：All values for a key are sent to the same reducer

Leave a Comment

Your email address will not be published.

This site uses Akismet to reduce spam. Learn how your comment data is processed.