Hadoop官方那个详细教程http://hadoop.apache.org/common/docs/r0.18.2/cn/mapred_tutorial.html#Mapper
Hadoop官方那个详细教程
http://hadoop.apache.org/common/docs/r0.18.2/cn/mapred_tutorial.html#Mapper
Hadoop官方那个详细教程
http://hadoop.apache.org/common/docs/r0.18.2/cn/mapred_tutorial.html#Mapper