sqoop连接DB2导入数据至HDFS时，报错，显示连接超时.
用list-table命令连接没有问题，结果正确；
测试过DB2远程连接，没有问题，telnet 测试端口也没有问题；
DB2版本v9.7，用的安装包里面的JDBC插件.
以下是错误信息。
[biadmin@Hadoop01 sqoop]$ ./bin/sqoop import --connect jdbc:db2://9.112.30.177:50000/content --username db2admin --P --table DB2ADMIN.PERSON --as-textfile -m 1 --target-dir /user/test
Warning: /opt/ibm/biginsights/sqoop/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
/opt/ibm/biginsights/sqoop/bin/configure-sqoop: line 181: /opt/ibm/biginsights/hive/hcatalog/bin/hcat: Permission denied
16/03/02 08:27:38 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6
Enter password:
16/03/02 08:27:46 INFO manager.SqlManager: Using default fetchSize of 1000
16/03/02 08:27:46 INFO tool.CodeGenTool: Beginning code generation
16/03/02 08:28:49 ERROR manager.SqlManager: Error executing statement: com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.14.113] Exception java.net.ConnectException: Error opening socket to server /9.112.30.177 on port 50,000 with message: Connection timed out. ERRORCODE=-4499, SQLSTATE=08001
com.ibm.db2.jcc.am.DisconnectNonTransientConnectionException: [jcc][t4][2043][11550][4.14.113] Exception java.net.ConnectException: Error opening socket to server /9.112.30.177 on port 50,000 with message: Connection timed out. ERRORCODE=-4499, SQLSTATE=08001
at com.ibm.db2.jcc.am.ed.a(ed.java:320)
at com.ibm.db2.jcc.am.ed.a(ed.java:338)
at com.ibm.db2.jcc.t4.vb.a(vb.java:434)
at com.ibm.db2.jcc.t4.vb.(vb.java:93)
at com.ibm.db2.jcc.t4.a.b(a.java:354)
at com.ibm.db2.jcc.t4.b.newAgent_(b.java:2030)
at com.ibm.db2.jcc.am.Connection.initConnection(Connection.java:731)
at com.ibm.db2.jcc.am.Connection.(Connection.java:680)
at com.ibm.db2.jcc.t4.b.(b.java:334)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:232)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:198)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:475)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:116)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:226)
at org.apache.sqoop.manager.SqlManager.makeConnection(SqlManager.java:885)
at org.apache.sqoop.manager.GenericJdbcManager.getConnection(GenericJdbcManager.java:52)
at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:744)
at org.apache.sqoop.manager.SqlManager.execute(SqlManager.java:767)
at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:270)
at org.apache.sqoop.manager.SqlManager.getColumnTypesForRawQuery(SqlManager.java:241)
at org.apache.sqoop.manager.SqlManager.getColumnTypes(SqlManager.java:227)
at org.apache.sqoop.manager.ConnManager.getColumnTypes(ConnManager.java:295)
at org.apache.sqoop.orm.ClassWriter.getColumnTypes(ClassWriter.java:1833)
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1645)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:107)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:605)
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.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:369)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:230)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:212)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:403)
at java.net.Socket.connect(Socket.java:642)
at com.ibm.db2.jcc.t4.v.run(v.java:49)
at java.security.AccessController.doPrivileged(AccessController.java:330)
at com.ibm.db2.jcc.t4.vb.a(vb.java:420)
... 31 more
16/03/02 08:28:49 ERROR tool.ImportTool: Encountered IOException running import job: java.io.IOException: No columns to generate for ClassWriter
at org.apache.sqoop.orm.ClassWriter.generate(ClassWriter.java:1651)
at org.apache.sqoop.tool.CodeGenTool.generateORM(CodeGenTool.java:107)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:478)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:605)
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)
