Question

当我连接到一个集群（aaaaaa1）上的mysql和另一个服务器（aaaaaa2）上的sqooop时，我遇到以下错误，尽管在mySql中创建了一个表，并且授予了另一个集合的完全权限群集。

请帮我确定一下这个问题的原因。谢谢！

**$sqoop import --connect jdbc:mysql://(address of mysql):11000/sqoopdemo --table widgets**
12/10/12 10:42:23 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
12/10/12 10:42:23 INFO tool.CodeGenTool: Beginning code generation
12/10/12 10:42:23 ERROR manager.SqlManager: Error executing statement: 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.
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.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
        at java.sql.DriverManager.getConnection(DriverManager.java:582)
        at java.sql.DriverManager.getConnection(DriverManager.java:207)
        at com.cloudera.sqoop.manager.SqlManager.makeConnection(SqlManager.java:684)
        at com.cloudera.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:53)
        at com.cloudera.sqoop.manager.SqlManager.execute(SqlManager.java:473)
        at com.cloudera.sqoop.manager.SqlManager.execute(SqlManager.java:496)
        at com.cloudera.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:195)
        at com.cloudera.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:179)
        at com.cloudera.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:116)
        at com.cloudera.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1226)
        at com.cloudera.sqoop.orm.ClassWriter.generate(ClassWriter.java:1051)
        at com.cloudera.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:84)
        at com.cloudera.sqoop.tool.ImportTool.importTable(ImportTool.java:370)
        at com.cloudera.sqoop.tool.ImportTool.run(ImportTool.java:456)
        at com.cloudera.sqoop.Sqoop.run(Sqoop.java:146)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at com.cloudera.sqoop.Sqoop.runSqoop(Sqoop.java:182)
        at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:221)
        at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:230)
        at com.cloudera.sqoop.Sqoop.main(Sqoop.java:239)
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at java.net.Socket.connect(Socket.java:478)
        at java.net.Socket.<init>(Socket.java:375)
        at java.net.Socket.<init>(Socket.java:218)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
        ... 32 more
12/10/12 10:42:23 ERROR manager.CatalogQueryManager: Failed to list columns
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.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
        at java.sql.DriverManager.getConnection(DriverManager.java:582)
        at java.sql.DriverManager.getConnection(DriverManager.java:207)
        at com.cloudera.sqoop.manager.SqlManager.makeConnection(SqlManager.java:684)
        at com.cloudera.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:53)
        at com.cloudera.sqoop.manager.CatalogQueryManager.getColumnNames(CatalogQueryManager.java:147)
        at com.cloudera.sqoop.orm.ClassWriter.getColumnNames(ClassWriter.java:1198)
        at com.cloudera.sqoop.orm.ClassWriter.generate(ClassWriter.java:1053)
        at com.cloudera.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:84)
        at com.cloudera.sqoop.tool.ImportTool.importTable(ImportTool.java:370)
        at com.cloudera.sqoop.tool.ImportTool.run(ImportTool.java:456)
        at com.cloudera.sqoop.Sqoop.run(Sqoop.java:146)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at com.cloudera.sqoop.Sqoop.runSqoop(Sqoop.java:182)
        at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:221)
        at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:230)
        at com.cloudera.sqoop.Sqoop.main(Sqoop.java:239)
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at java.net.Socket.connect(Socket.java:478)
        at java.net.Socket.<init>(Socket.java:375)
        at java.net.Socket.<init>(Socket.java:218)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)
        ... 28 more
12/10/12 10:42:23 ERROR sqoop.Sqoop: Got exception running Sqoop: java.lang.RuntimeException: 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.
java.lang.RuntimeException: 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.        at com.cloudera.sqoop.manager.CatalogQueryManager.getColumnNames(CatalogQueryManager.java:163)
        at com.cloudera.sqoop.orm.ClassWriter.getColumnNames(ClassWriter.java:1198)
        at com.cloudera.sqoop.orm.ClassWriter.generate(ClassWriter.java:1053)
        at com.cloudera.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:84)
        at com.cloudera.sqoop.tool.ImportTool.importTable(ImportTool.java:370)
        at com.cloudera.sqoop.tool.ImportTool.run(ImportTool.java:456)
        at com.cloudera.sqoop.Sqoop.run(Sqoop.java:146)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:65)
        at com.cloudera.sqoop.Sqoop.runSqoop(Sqoop.java:182)
        at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:221)
        at com.cloudera.sqoop.Sqoop.runTool(Sqoop.java:230)
        at com.cloudera.sqoop.Sqoop.main(Sqoop.java:239)
Caused by: 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.
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1116)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:344)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2332)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2369)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2153)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:792)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:381)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:305)
        at java.sql.DriverManager.getConnection(DriverManager.java:582)
        at java.sql.DriverManager.getConnection(DriverManager.java:207)
        at com.cloudera.sqoop.manager.SqlManager.makeConnection(SqlManager.java:684)
        at com.cloudera.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:53)
        at com.cloudera.sqoop.manager.CatalogQueryManager.getColumnNames(CatalogQueryManager.java:147)
        ... 11 more
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:351)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:213)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:200)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:529)
        at java.net.Socket.connect(Socket.java:478)
        at java.net.Socket.<init>(Socket.java:375)
        at java.net.Socket.<init>(Socket.java:218)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:257)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:294)

Answer 1

您似乎没有使用参数--username和--password来指定可疑的MySQL用户名和密码。我建议明确设置凭据。此外，默认情况下，MySQL在端口3306上运行而不是11000，因此请确保端口正确。

之后，请尝试使用mysql命令行实用程序从运行Sqoop的同一台计算机连接到MySQL框：

mysql -h（mysql的地址）-p 11000 -u（用户名）-p（密码）sqoopdemo

如果您无法连接到MySQL框，可以共享此命令的输出，那将会很棒。

Answer 2

在服务器（aaaaaa1）上查找my.cnf中的bind-address设置，并确保它正在侦听您要定位的IP地址（或主机名）（ipa aaaaaa1）。您可能还需要确保不启用跳过网络！或者（并且不太安全！）以下将设置为侦听所有地址 - 本地和远程： bind-address = 0.0.0.0

这意味着在my.cnf文件中用bind-address = 0.0.0.0替换bind-address = 127.0.0.1。 my.cnf文件位于/ etc / mysql文件夹中。请重启你的mysql服务器在尝试使用IP地址或计算机名称之前。只是为了测试尝试在aaaaaa1的命令行上运行它：mysql -h -u -p

如果以上运行正常，则在aaaaaa2上运行sqoop命令。确保您已创建用户（）并已授予用户所有权限。

这对我有用。希望，它也适合你！ :)

参考：http://pavanchalla.blogspot.in/2013/10/mapreduce.html

Answer 3

请运行以下sqoop命令

sqoop import --connect jdbc：mysql：//（mysql的地址）：3306 / sqoopdemo --table widgets

Answer 4

通过为ip地址提供适当的权限解决了我的问题：授予。的所有权限至root@192.168.42.1由'root'WITH GRANT OPTION识别;

有不同的IPV4 IP地址，请确保您选择正确的IP地址

Apache Sqoop通信链路故障

4 个答案: