2021-09-30

Posted 2021-10-19 dqz_nihao

解决Caused by: java.sql.SQLException: null, message from server: "Host 'master' is not allowed to connect to this mysql server"

• 今天在使用flume和mysql进行数据传输的时候，遇到这个问题。

今天在使用flume和mysql进行数据传输的时候，遇到这个问题。

**2021-09-30 08:40:48,677 (conf-file-poller-0) [WARN - org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:93)] HHH000402: Using Hibernate built-in connection pool (not for production use!)
2021-09-30 08:40:49,046 (conf-file-poller-0) [ERROR - org.apache.flume.node.AbstractConfigurationProvider.loadSources(AbstractConfigurationProvider.java:361)] Source sql-source has been removed due to an error during configuration**
org.hibernate.exception.JDBCConnectionException: Error calling Driver#connect
	at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator$1$1.convert(BasicConnectionCreator.java:122)
	at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.convertSqlException(BasicConnectionCreator.java:140)
	at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:58)
	at org.hibernate.engine.jdbc.connections.internal.BasicConnectionCreator.createConnection(BasicConnectionCreator.java:75)
	at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:106)
	at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
	at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:260)
	at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:94)
	at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:111)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:234)
	at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:206)
	at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1887)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1845)
	at org.keedio.flume.source.HibernateHelper.establishSession(HibernateHelper.java:67)
	at org.keedio.flume.source.SQLSource.configure(SQLSource.java:82)
	at org.apache.flume.conf.Configurables.configure(Configurables.java:41)
	at org.apache.flume.node.AbstractConfigurationProvider.loadSources(AbstractConfigurationProvider.java:326)
	at org.apache.flume.node.AbstractConfigurationProvider.getConfiguration(AbstractConfigurationProvider.java:101)
	at org.apache.flume.node.PollingPropertiesFileConfigurationProvider$FileWatcherRunnable.run(PollingPropertiesFileConfigurationProvider.java:141)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)
**Caused by: java.sql.SQLException: null,  message from server: "Host 'master' is not allowed to connect to this MySQL server"**
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:998)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:937)
	at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:926)
	at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1037)
	at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2239)
	at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2270)
	at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2069)
	at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:794)
	at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.jdbc.Util.handleNewInstance(Util.java:389)
	at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:399)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
	at org.hibernate.engine.jdbc.connections.internal.DriverConnectionCreator.makeConnection(DriverConnectionCreator.java:55)
	... 25 more
^C2021-09-30 08:41:48,653 (agent-shutdown-hook) [INFO - org.apache.flume.lifecycle.LifecycleSupervisor.stop(LifecycleSupervisor.java:78)] Stopping lifecycle supervisor 11

然后就查找了一些资料，一开始以为是flume/conf里的配置文件写的错误，找了很久，也没有发现什么问题，然后发现是mysql的的访问权限的问题。

mysql> use mysql
No connection. Trying to reconnect...
Connection id:    11
Current database: *** NONE ***

Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select user,host from user;
+---------------+-----------+
| user          | host      |
+---------------+-----------+
| mysql.session | localhost |
| mysql.sys     | localhost |
| root          | localhost |
+---------------+-----------+
3 rows in set (0.03 sec)

这里的root的host是localhost，不允许远程访问，下面是对root的host进行修改为%，允许远程访问

mysql> update user set host = '%' where user = 'root';
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0

mysql> select user,host from user;
+---------------+-----------+
| user          | host      |
+---------------+-----------+
| root          | %         |
| mysql.session | localhost |
| mysql.sys     | localhost |
+---------------+-----------+
3 rows in set (0.00 sec)

mysql> flush privileges;
Query OK, 0 rows affected (0.03 sec)

这里flush privileges是为了刷新内存中的权限，就不用重启mysql服务了