sqoop连接数据库报错com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

本文详细解析了在使用Sqoop连接MySQL时遇到的“Access denied”错误,并提供了两步解决方案:一是确保MySQL服务已启动;二是正确配置连接地址、用户名及密码。

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报错信息

java.sql.SQLException: Access denied for user 'root'@'hd00' (using password: YES)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:928)
 at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1750)
 at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1290)
 at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2493)
 at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2526)
 at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2311)
 at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
 at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
 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:411)
 at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
 at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)
 at java.sql.DriverManager.getConnection(DriverManager.java:664)
 at java.sql.DriverManager.getConnection(DriverManager.java:247)
 at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:904)
 at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)
 at org.apache.sqoop.manager.CatalogQueryManager.listDatabases(CatalogQueryManager.java:57)
 at org.apache.sqoop.tool.ListDatabasesTool.run(ListDatabasesTool.java:49)
 at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
 at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
 at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
 at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
 at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
 at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
19/08/17 18:07:26 ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.RuntimeException: java.sql.SQLException: Access denied for user 'root'@'hd00' (using password: YES)
java.lang.RuntimeException: java.sql.SQLException: Access denied for user 'root'@'hd00' (using password: YES)
 at org.apache.sqoop.manager.CatalogQueryManager.listDatabases(CatalogQueryManager.java:73)
 at org.apache.sqoop.tool.ListDatabasesTool.run(ListDatabasesTool.java:49)
 at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
 at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
 at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
 at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
 at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
 at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
Caused by: java.sql.SQLException: Access denied for user 'root'@'hd00' (using password: YES)
 at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4237)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4169)
 at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:928)
 at com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1750)
 at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1290)
 at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2493)
 at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2526)
 at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2311)
 at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:834)
 at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
 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:411)
 at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:416)
 at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:347)
 at java.sql.DriverManager.getConnection(DriverManager.java:664)
 at java.sql.DriverManager.getConnection(DriverManager.java:247)
 at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:904)
 at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)
 at org.apache.sqoop.manager.CatalogQueryManager.listDatabases(CatalogQueryManager.java:57)
 ... 7 more

解决方法
经过检查发现是

第一次是mysql所在虚拟机的服务没有启动
	systemctl start  mysqld.service  //启动
	systemctl status mysqld.service //查看状态
		
第二次是链接地址密码密码
bin/sqoop-list-databases --connect jdbc:mysql://mysql所在主机ip:3306 --username XXX --password XXX
--username是mysql的用户名
--username是mysql的密码
我写成了他所在的主机密码所以报错



希望能帮到大家~~~
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