通过hadoop上的hive完成WordCount

启动hadoop

ssh localhostcd /usr/local/hadoop./sbin/start-dfs.shcd /usr/local/hive/libservice mysql startstart-all.sh

 

Hdfs上创建文件夹

hdfs dfs -mkdir test1hdfs dfs -ls /user/hadoop

 

上传文件至hdfs

hdfs dfs -put ./try.txt test1hdfs dfs -ls /user/hadoop/test1

 

启动Hive

hive

 

创建原始文档表

create table docs(line string)

 

导入文件内容到表docs并查看

1 2	load data inpath '/user/hadoop/tese1/try.txt' overwrite into table docs select * from docs

　　

用HQL进行词频统计，结果放在表word_count里

1	create table word_count as select word,count(1) as count from ( select explode(split(line, " " )) as word from docs) word group by word order by word;

　　

查看统计结果

show tables;select * from word_count;