集群hadoop2.7.5运行wordcount实例

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cd
mkdir input
vim input/test.txt

随便输入点内容

hello hadoop
how are you
fine thank you

hadoop fs -mkdir -p /user/hadoop/input      #fs方式创建文件夹
hadoop fs -put ./input/test.txt input/      #把本地test.txt传到集群
hadoop fs -ls input/                        #查看input目录结构
hadoop jar /usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-*.jar wordcount  input out    #运行wordcount

hadoop fs -ls /user/hadoop/out              #查看结果，跟本地结果一致
hadoop fs -cat /user/hadoop/out/part-r-00000

hadoop fs -get /user/hadoop/out/part-r-00000 ./  #通过get命令，把文件下载到本地
ll      #查看本地文件信息