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  • hive基本操作与应用

    通过hadoop上的hive完成WordCount

    启动hadoop

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

    Hdfs上创建文件夹

    hdfs dfs -mkdir demo
    hdfs dfs -ls /home/hadoop
    

    上传文件至hdfs

    hdfs dfs -put ./zxc.txt demo
    hdfs dfs -ls /home/hadoop/demo
    

     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 '/home/hadoop/demo/zxc.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

    show tables;
    select * from word_count;
    

      

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  • 原文地址:https://www.cnblogs.com/onlythisone/p/9048146.html
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