程序
k2 v2hello 1word 1hello 1hello 1hello 1nihao 1
a.txt
k1 v11 hello word2 hello hello3 hello nihao4 ceshi
hello wordhello hellohello nihaoceshixixi
k3 v3hello 4word 1nihao 1
inputformat
hello 4word 1nihao 1
通过我们的代码
map阶段
reduce阶段
