Hive基本操作与应用

通过hadoop上的hive完成WordCount

启动hadoop

复制代码
ssh localhost
cd /usr/local/hadoop
./sbin/start-dfs.sh
cd /usr/local/hive/lib
service mysql start
start-all.sh
复制代码

 

Hdfs上创建文件夹

hdfs dfs -mkdir test1
hdfs dfs -ls /user/hadoop

 

上传文件至hdfs

hdfs dfs -put ./try.txt test1
hdfs 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

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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

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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;

 

posted on 2018-05-16 20:17  阿丹丹酱  阅读(99)  评论(0编辑  收藏  举报

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