使用MySQL作为Hive的Metastore

先确保你已经成功安装了HIVE和MYSQL在hive-site.xml中添加如下内容，指定METASTORE的地址以及连接方式<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://10.20.151.10:3306/hive？characterEncoding=UTF-8</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.option.ConnectionUserName</name>
<value>hive_user</value>
<description>username to use against metastore database</description>
</property>
<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>123</value>
<description>password to use against metastore database</description>
</property>然后登陆到HIVE客户端，创建一个表试试[gpadmin1@Hadoop5 hive-0.6.0]$ bin/hive
Hive history file=/tmp/gpadmin1/hive_job_log_gpadmin1_201106081130_1156785421.txt
hive> show tables;
FAILED: Error in metadata: javax.jdo.JDOFatalDataStoreException: Unknown database "hive"
NestedThrowables:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown database "hive"
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask报错了，提示很明显，识别不到名称为hive的database，难道要自己创建？试试[Intranet root@www.linuxidc.com /var/lib/mysql]
#mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or g.
Your MySQL connection id is 41
Server version: 5.5.12 MySQL Community Server （GPL）Copyright （c） 2000, 2010, 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> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set （0.00 sec）mysql> create database hive;
Query OK, 1 row affected （0.00 sec）mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| hive               |
| mysql              |
| performance_schema |
| test               |
+--------------------+
5 rows in set （0.00 sec）再登陆到HIVE里看看[gpadmin1@hadoop5 hive-0.6.0]$ bin/hive
Hive history file=/tmp/gpadmin1/hive_job_log_gpadmin1_201106081130_544334815.txt
hive> show table;
FAILED: Parse Error: line 0:-1 mismatched input "<EOF>" expecting EXTENDED in show statementhive> show tables;
OK
Time taken: 5.173 seconds
hive>         CREATE TABLE u_tmp1 （id1 INT,
    >            id2 int
    >            ）
    >          ROW FORMAT DELIMITED
    >          FIELDS TERMINATED BY ",";
OK
Time taken: 0.266 seconds
hive> show tables;
OK
u_tmp1
Time taken: 0.197 seconds
hive> OK了，果然是这个问题

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