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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 /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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  • 原文地址:https://www.cnblogs.com/yjwamao/p/9048300.html
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