Word_Count实验
今天试用了Hive的，MapReduce实现Word_Count
1. 创建input目录，output目录会自动生成。其中input为输入目录，output目录为输出目录。命令如下：
cd /usr/local/games mkdir input
2.然后，在input文件夹中创建两个测试文件file1.txt和file2.txt，命令如下：
cd /usr/local/hadoop/input echo "hello MuZhadoDi" > file1.txt echo "MuZhadoDi likes hadoop" > file2.txt
3.然后进入Hive-shell下，输入下列命令：
create table docs(line string); load data inpath 'file:///usr/local/games/input' overwrite into table docs; create table word_count as select word, count(1) as count from (select explode(split(line,' '))as word from docs) w group by word order by word;
4.然后查询语句，查询结果：
select * from word_count