尝试使用sqoop执行增量导入作业，但出现如下所示的错误。我也把我用来做同样的代码。这些表在rdbms中，我正在尝试将其增量导入到hdfs中。只有在执行作业时抛出错误，才能成功创建作业。管理服务器工作正常。我检查了登录凭据，重新启动了管理服务器并运行了sqoop作业，但错误仍然存在。我在伪分发模式localhost上设置了hadoop。

sqoop job --create <jobname> -- import \
--connect "jdbc:sqlserver://<servername>;database=<databasename>" \
--username "<username>" \
--password "<password>" \
--driver com.microsoft.sqlserver.jdbc.SQLServerDriver \
--table "<tablename>" \
--append \
--check-column "<columnname>" \
--last-value < > \
--incremental lastmodified \
--fields-terminated-by <> \
--target-dir <path> \
-m 1

ERROR manager.SqlManager: Error executing statement: com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user '<username>'. ClientConnectionId:<clientconnectionid>
com.microsoft.sqlserver.jdbc.SQLServerException: Login failed for user '<username>'. ClientConnectionId:<clientconnectionid>
    at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:216)
    at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(tdsparser.java:254)
    at com.microsoft.sqlserver.jdbc.TDSParser.parse(tdsparser.java:84)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.sendLogon(SQLServerConnection.java:2964)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.logon(SQLServerConnection.java:2244)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.access$000(SQLServerConnection.java:43)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection$LogonCommand.doExecute(SQLServerConnection.java:2230)
    at com.microsoft.sqlserver.jdbc.TDSCommand.execute(IOBuffer.java:5696)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(SQLServerConnection.java:1717)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectHelper(SQLServerConnection.java:1328)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.login(SQLServerConnection.java:993)
    at com.microsoft.sqlserver.jdbc.SQLServerConnection.connect(SQLServerConnection.java:829)
    at com.microsoft.sqlserver.jdbc.SQLServerDriver.connect(SQLServerDriver.java:1012)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    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.tool.JobTool.execJob(JobTool.java:228)
    at org.apache.sqoop.tool.JobTool.run(JobTool.java:283)
    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)
18/01/11 15:07:32 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.tool.JobTool.execJob(JobTool.java:228)
    at org.apache.sqoop.tool.JobTool.run(JobTool.java:283)
    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)