hive基本操作与应用

通过hadoop上的hive完成WordCount

启动hadoop

cd /usr/local/hadoop
./sbin/start-dfs.sh
cd /usr/local/hive/lib
service mysql start
start-all.sh

Hdfs上创建文件夹

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

上传文件至hdfs

hdfs dfs -put ~/amao.txt wcinput
hdfs dfs -ls /user/hadoop/wcinput

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

load data inpath '/user/hadoop/wcinput/amao.txt' overwrite into table docs
select * from 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) as count from (select explode(split(line," ")) as word from docs) word group by word order by word;

查看统计结果

select * from word_count;
 
 
 
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posted on 2018-05-16 21:58  181冯荣彬  阅读(87)  评论(0编辑  收藏  举报

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