默认情况下，hive的元数据信息存储在内置的Derby数据中。Facebook将hive元数据存储在关系数据库
1、安装好mysql ，sudo apt-get install mysql-server
2、创建mysql用户hadoop
$ mysql -u root -p 进入root用户
mysql> CREATE USER 'hadoop'@'localhost' IDENTIFIED BY 'hadoop';
3、授权：mysql> GRANT ALL PRIVILEGES ON *.* TO'hadoop'@'localhost' WITH GRANT OPTION;
4、登录到hadoop 用户 $ mysql -u hadoop -p
5、创建数据库hive
mysql>create database hive;
6、修改hive中hive-site.xml
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>hive.metastore.local</name>
<value>true</value>
<description>Thrift uri for the remote metastore. Used by metastore client to connect to remote metastore.</description>
</property>
<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://localhost:3306/hive?createDatabaseIfNotExist=true</value>
<description>JDBC connect string for a JDBC metastore</description>
</property>
<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
<description>Driver class name for a JDBC metastore</description>
</property>
<property>
<name>javax.jdo.PersistenceManagerFactoryClass</name>
<value>org.datanucleus.jdo.JDOPersistenceManagerFactory</value>
<description>class implementing the jdo persistence</description>
</property>
<property>
<name>javax.jdo.option.DetachAllOnCommit</name>
<value>true</value>
<description>detaches all objects from session so that they can be used after transaction is committed</description>
</property>
<property>
<name>javax.jdo.option.NonTransactionalRead</name>
<value>true</value>
<description>reads outside of transactions</description>
</property>
<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>hadoop</value>
<description>username to use against metastore database</description>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>hadoop</value>
<description>password to use against metastore database</description>
</property>
</configuration>
7、将mysql jdbc driver拷贝到hive的lib下
8、测试：
hive> create table tmp(info int);
OK
Time taken: 0.66 seconds
hive> show tables;
OK
tmp
Time taken: 0.138 seconds
hive> exit;
hadoop@hadoop-VirtualBox:~/hive-0.10.0$ mysql -u hadoop -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 50
Server version: 5.5.37-0ubuntu0.12.10.1 (Ubuntu)
Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or 'h' for help. Type 'c' to clear the current input statement.
mysql> use hive;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> show tables;
+---------------------------+
| Tables_in_hive |
+---------------------------+
| BUCKETING_COLS |
| CDS |
| COLUMNS_V2 |
| DATABASE_PARAMS |
| DBS |
| PARTITION_KEYS |
| SDS |
| SD_PARAMS |
| SEQUENCE_TABLE |
| SERDES |
| SERDE_PARAMS |
| SKEWED_COL_NAMES |
| SKEWED_COL_VALUE_LOC_MAP |
| SKEWED_STRING_LIST |
| SKEWED_STRING_LIST_VALUES |
| SKEWED_VALUES |
| SORT_COLS |
| TABLE_PARAMS |
| TBLS |
+---------------------------+
19 rows in set (0.01 sec)
mysql> select * from COLUMNS_V2;
+-------+---------+-------------+-----------+-------------+
| CD_ID | COMMENT | COLUMN_NAME | TYPE_NAME | INTEGER_IDX |
+-------+---------+-------------+-----------+-------------+
| 1 | NULL | info | int | 0 |
+-------+---------+-------------+-----------+-------------+
1 row in set (0.01 sec)
mysql> select * from tbls;
ERROR 1146 (42S02): Table 'hive.tbls' doesn't exist
mysql> select * from TBLS;
+--------+-------------+-------+------------------+--------+-----------+-------+----------+---------------+--------------------+--------------------+
| TBL_ID | CREATE_TIME | DB_ID | LAST_ACCESS_TIME | OWNER | RETENTION | SD_ID | TBL_NAME | TBL_TYPE | VIEW_EXPANDED_TEXT | VIEW_ORIGINAL_TEXT |
+--------+-------------+-------+------------------+--------+-----------+-------+----------+---------------+--------------------+--------------------+
| 1 | 1399452288 | 1 | 0 | hadoop | 0 | 1 | tmp | MANAGED_TABLE | NULL | NULL |
+--------+-------------+-------+------------------+--------+-----------+-------+----------+---------------+--------------------+--------------------+
1 row in set (0.02 sec)
mysql> exit;