Hadoop示例程序WordCount详解及实例http://blog.csdn.net/xw13106209/article/details/6116323

hadoop中使用MapReduce编程实例（转）http://eric-gcm.iteye.com/blog/1807468

【mapreduce进阶编程二】奇偶行分别求和http://www.aboutyun.com/forum.php?mod=viewthread&tid=9360

hadoop2.2.0 MapReduce求和并排序http://www.cnblogs.com/mengyao/p/4151509.html

MapReduce求最大值http://blog.csdn.net/lzm1340458776/article/details/43227759

慢慢看！