解决安装配置hive时出错Caused by: com.mysql.cj.core.exceptions.CJCommunicationsException: Communications link

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当我按照教程配置好后出现打开hive出现了这样的错误
Caused by: java.sql.SQLException: Unable to open a test connection to the given database. JDBC url = jdbc:mysql://hadoop-virtual-machine:3306/hive?CreateDatabaseIfNotExist=true, username = hive. Terminating connection pool (set lazyInit to true if you expect to start your database after your app). Original Exception: ------

com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

在网上也找到了很多帖子也尝试了他们的方法，但是都不起作用

然后我看都有个帖子说是重点JDBC url = jdbc:mysql://hadoop-virtual-machine:3306/hive?CreateDatabaseIfNotExist=true, username = hive.这里出了问题，那我就查看了我的3306端口到底有没有被监听，

netstat -an|grep 3306

结果是3306前面是127.0.0.1，是127.0.0.1:3306这么写的，我尝试着把hive-site.xml里面的 jdbc:mysql://hadoop-virtual-machine:3306/hive?CreateDatabaseIfNotExist=true改成 jdbc:mysql://127.0.0.1:3306/hive?CreateDatabaseIfNotExist=true，然后我重新把hadoop进一遍，MySQL服务也重启一遍，原谅我就是这么神经，然后开启hive

然后hive成功开启

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