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-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 ./1.txt wcinput hdfs dfs -ls /user/hadoop/wcinput
启动Hive
start-all.sh 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/1.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 (se lect 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;