NestedThrowables:
java.sql.SQLException: Unable to open a test connection to the given database. JDBC url = jdbc:mysql://hadoop:3306/metastore?createDatabaseIfNotExist=true, username = root. Terminating connection pool (set lazyInit to true if you expect to start your database after your app). Original Exception: ------
java.sql.SQLException: null,  message from server: "Host 'bigdata-senior01' is not allowed to connect to this MySQL server

学习hive过程中，安装好了mysql并且完成了hive的配置

bin/hive

今天在启动hive的时候，报错。

主要有以下三个原因：

1.hive配置失败

在conf/下配置hive-site.xml   我的主机名是bigdata （自己修改）

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
        <property>
                <name>javax.jdo.option.ConnectionURL</name>
                <value>jdbc:mysql://bigdata:3306/metastore?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.option.ConnectionUserName</name>
                <value>root</value>
                <description>username to use against metastore database</description>
        </property>
        <property>
                <name>javax.jdo.option.ConnectionPassword</name>
                <value>12345</value>
                <description>password to use against metastore database</description>
        </property>

        <property>
                <name>hive.cli.print.header</name>
                <value>true</value>
                <description>Whether to print the names of the columns in query output.</description>
        </property>

        <property>
                <name>hive.cli.print.current.db</name>
                <value>true</value>
                <description>Whether to include the current database in the Hive prompt.</description>
        </property>
</configuration>

 

2.导入的jar包错误或者版本太低

这里我使用的数据库是5.7但是没有对应的jar包，所以可以使用高一点的版本  比如8.0.16

然后把jar包拷贝到hive目录下的lib文件夹中

 

3.忘记启动hadoop，（初学者容易遗忘的原因），hive是基于hadoop的数据仓库，首先要启动hadoop之后才能使用hive连接数据库，切记切记/

之后重新启动即可