hive的安装配置笔记

1.上传hive安装包

2.解压

3.配置Hive(在一台机器上即可)

    mv hive-env.sh.template hive-env.sh

4.运行hive
发现内置默认的metastore存在问题（1.换执行路径后，原来的表不存在了。2.只能有一个用户访问同一个表）

5.配置mysql的metastore
查询以前安装的mysql相关包

        rpm -qa | grep mysql

    暴力删除这个包

        rpm -e mysql-libs-5.1.66-2.el6_3.i686 --nodeps

    上传两个mysql的rpm包

        rpm -ivh MySQL-server-5.1.73-1.glibc23.i386.rpm 
        rpm -ivh MySQL-client-5.1.73-1.glibc23.i386.rpm

     执行命令设置mysql

        /usr/bin/mysql_secure_installation

     授权：

        GRANT ALL PRIVILEGES ON hive.* TO 'root'@'%' IDENTIFIED BY '123' WITH GRANT OPTION;
        FLUSH PRIVILEGES

      在hive当中创建两张表

        create table trade_detail (id bigint, account string, income double, expenses double, time string) row format delimited fields terminated by '\t';
        create table user_info (id bigint, account string, name  string, age int) row format delimited fields terminated by '\t';

    将mysql当中的数据直接导入到hive当中

        sqoop import --connect jdbc:mysql://192.168.1.10:3306/itcast --username root --password 123 --table trade_detail --hive-import --hive-overwrite --hive-table trade_detail --fields-terminated-by '\t'
        sqoop import --connect jdbc:mysql://192.168.1.10:3306/itcast --username root --password 123 --table user_info --hive-import --hive-overwrite --hive-table user_info --fields-terminated-by '\t'

    创建一个result表保存前一个sql执行的结果

        create table result row format delimited fields terminated by '\t' as select t2.account, t2.name, t1.income, t1.expenses, t1.surplus from user_info t2 join (select account, sum(income) as income, sum(expenses) as expenses, sum(income-expenses) as surplus from trade_detail group by account) t1 on (t1.account = t2.account);

        create table user (id int, name string) row format delimited fields terminated by '\t'

    将本地文件系统上的数据导入到HIVE当中

        load data local inpath '/root/user.txt' into table user;

   创建外部表

        create external table stubak (id int, name string) row format delimited fields terminated by '\t' location '/stubak';

     创建分区表
     普通表和分区表区别：有大量数据增加的需要建分区表

        create table book (id bigint, name string) partitioned by (pubdate string) row format delimited fields terminated by '\t'; 

    分区表加载数据

        load data local inpath './book.txt' overwrite into table book partition (pubdate='2023-08-22');