hive基本操作与应用

Posted on 2018-05-16 20:58  170何强  阅读(121)  评论(0编辑  收藏  举报

通过hadoop上的hive完成WordCount

启动hadoop

start-all.sh

 

Hdfs上创建文件夹

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

 

上传文件至hdfs

hdfs dfs -put ./test.txt testinput
hdfs dfs -ls /user/hadoop/testinput

 

启动Hive

hive

 

创建原始文档表

create table docs(line string);<br>show tables;

 

导入文件内容到表docs并查看

load data inpath '/user/hadoop/testinput/test.txt' overwrite into table docs;

 

用HQL进行词频统计,结果放在表word_count里

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

 

查看统计结果

select * from word_count;

 

 

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