mysql - hive 中的元数据错误

Question

我在CENT OS的同一台服务器上安装了hadoop、hive和MySQL。我还设置了 MySQL 和用户 ID - hive 可以通过以下步骤访问数据库。

mysql> CREATE DATABASE metastore;
mysql> USE metastore;

mysql> SOURCE $HIVE_HOME/scripts/metastore/upgrade/mysql/hive-schema-0.10.0.mysql.sql;

mysql> CREATE USER 'hiveuser'@'%' IDENTIFIED BY 'hivepassword'; 

mysql> GRANT all on *.* to 'hiveuser'@localhost identified by 'hivepassword';

mysql>  flush privileges;

我的 Hive-site.xml 文件属性如下:

<property>
<name>javax.jdo.option.ConnectionURL</name>
<value>jdbc:mysql://localhost/metastorecreateDatabaseIfNotExist=true</value>
<description>metadata is stored in a MySQL server</description>
</property>

<property>
<name>javax.jdo.option.ConnectionDriverName</name>
<value>com.mysql.jdbc.Driver</value>
<description>MySQL JDBC driver class</description>
</property>

<property>
<name>javax.jdo.option.ConnectionUserName</name>
<value>hiveuser</value>
<description>user name for connecting to mysql server</description>      
</property>

<property>
<name>javax.jdo.option.ConnectionPassword</name>
<value>hivepassword</value>
<description>password for connecting to mysql server</description>
</property>

<property>
<name>hive.metastore.warehouse.dir</name>
<value>/user/hive/warehouse</value>
<description> warehouse </description>
</property>

当我在 hive shell 中发出 showtables 命令时，出现以下错误:

hive> show tables; FAILED: Error in metadata: java.lang.RuntimeException: Unable to instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask

我在互联网上搜索了所有内容，但找不到解决我的问题的方法。有人可以指导我吗，我在这里缺少什么？

Answer 1

1. First just check your hadoop daemons. All are up or not.

2. Else restart your hadoop cluster once.

3. Have you copied the jar (mysql-connector-java.***) into Hive's lib dir?

4. Which mysql version you are using. If it is very old then :

   mysql>alter database metastore_Db character set latin1;

 I think step 1 and 2 will solve your problem.