這兩天做個項目使用到sqoop，這東西以前用過，現在有點忘了，出了點差錯，記錄下來
環境
- hadoop 2.4.1
- jdk8
- sqoop 1.4.6
- centos7
- mysql 5.7.x
報錯
[root@mym sqoop]# bin/sqoop import \
> --connect jdbc:mysql://192.168.31.201:3306/company_test \
> --username root \
> --password 123456 \
> --table staff \
> --target-dir /home/mym/apps/test_dir/company_test \
> --delete-target-dir \
> --num-mappers 1 \
> --fields-terminated-by "\t"
Warning: /home/mym/apps/sqoop/bin/../../hcatalog does not exist! HCatalog jobs will fail.
Please set $HCAT_HOME to the root of your HCatalog installation.
Warning: /home/mym/apps/sqoop/bin/../../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
19/12/26 12:41:46 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6
19/12/26 12:41:46 WARN tool.BaseSqoopTool: Setting your password on the command-line is insecure. Consider using -P instead.
19/12/26 12:41:47 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
19/12/26 12:41:47 INFO tool.CodeGenTool: Beginning code generation
19/12/26 12:41:48 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `staff` AS t LIMIT 1
19/12/26 12:41:48 ERROR manager.SqlManager: Error reading from database: java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@61bb4e04 is still active. No statements may be issued when any streaming result sets are open and in use on a given connection. Ensure that you have called .close() on any active streaming result sets before attempting more queries.
java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@61bb4e04 is still active. No statements may be issued when any streaming result sets are open and in use on a given connection. Ensure that you have called .close() on any active streaming result sets before attempting more queries.
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:930)
at com.mysql.jdbc.MysqlIO.checkForOutstandingStreamingData(MysqlIO.java:2622)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1846)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2060)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2536)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2465)
at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1383)
at com.mysql.jdbc.ConnectionImpl.getMaxBytesPerChar(ConnectionImpl.java:2931)
at com.mysql.jdbc.Field.getMaxBytesPerCharacter(Field.java:582)
at com.mysql.jdbc.ResultSetMetaData.getPrecision(ResultSetMetaData.java:441)
at org.apache.sqoop.manager.SqlManager.getColumnInfoForRawQuery(SqlManager.java:286)
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)
19/12/26 12:41:48 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)
問題原因
mysql的驅動版本問題，個人使用的是mysql-connector-java-5.1.6其他版本可能也有問題
解決
從maven倉庫下載新一點版本的驅動jar
我這換成mysql-connector-java-5.1.47.jar就OK了