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HIVE安装遇到的问题

• 环境信息
  ubuntu 16.04

• 具体问题

  hive设置mysql为metastore数据库，执行数据库初始化命令

  schematool -initSchema -dbType mysql

出现以下问题：

> root@ubuntu:/home/ac# schematool -initSchema -dbType mysql   SLF4J:> Class path contains multiple SLF4J bindings. SLF4J: Found binding in> [jar:file:/usr/hive/lib/log4j-slf4j-impl-2.4.1.jar!/org/slf4j/impl/StaticLoggerBinder.class]> SLF4J: Found binding in> [jar:file:/usr/hadoop-2.7.4/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]> SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an> explanation. SLF4J: Actual binding is of type> [org.apache.logging.slf4j.Log4jLoggerFactory] Metastore connection> URL:  > jdbc:mysql://192.168.0.109:3306/hive?createDatabaseIfNotExist=true> Metastore Connection Driver :  com.mysql.jdbc.Driver Metastore> connection User:   hive> org.apache.hadoop.hive.metastore.HiveMetaException: Failed to get> schema version. Underlying cause:> com.mysql.jdbc.exceptions.jdbc4.CommunicationsException :> Communications link failure The last packet sent successfully to the> server was 0 milliseconds ago. The driver has not received any packets> from the server. SQL Error code: 0

如图:

• 解决办法

  检查mysql数据库运行状态

  systemctl status mysql.service

  如果运行状态为active 则mysql运行状态正常

  使用数据库可视化工具，无法链接数据库，但在ubuntu环境使用命令行登陆mysql，登陆正常

  mysql -u hive -p

问题根因：

mysql的默认配置为了增强安全性，禁止了非本机的访问，在ubuntu中是这样，debian中也是，需要修改
# vi /etc/mysql/my.cnf
修改
bind-address = 127.0.0.1 为 bind-address = 0.0.0.0

修改完成后重启mysql服务
sudo /etc/init.d/mysql restart

再次执行数据库初始化命令

schematool -initSchema -dbType mysql

初始化成功

备注：hive 安装以及设置mysql作为metastore 操作方法参见
http://www.linuxidc.com/Linux/2017-05/143864.htm