Question

这是我正在执行的命令。

 $ sqoop import --connect jdbc:mysql://localhost/hadoopguide --table widgets -m 1

错误 - ＆gt;＆gt;

$ sqoop import --connect jdbc:mysql://localhost/hadoopguide --table widgets -m 1
Warning: /media/akshay/MyMedia/sqoop-1.4.6.bin__hadoop-1.0.0/../hbase does not exist! HBase imports will fail.
Please set $HBASE_HOME to the root of your HBase installation.
Warning: /media/akshay/MyMedia/sqoop-1.4.6.bin__hadoop-1.0.0/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
Warning: /media/akshay/MyMedia/sqoop-1.4.6.bin__hadoop-1.0.0/../zookeeper does not exist! Accumulo imports will fail.
Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.
16/05/20 14:08:06 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6
16/05/20 14:08:06 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
16/05/20 14:08:06 INFO tool.CodeGenTool: Beginning code generation
16/05/20 14:08:06 INFO manager.SqlManager: Executing SQL statement: SELECT t.* FROM `widgets` AS t LIMIT 1
16/05/20 14:08:06 ERROR manager.SqlManager: Error reading from database: java.sql.SQLException: Streaming result set com.mysql.jdbc.RowDataDynamic@1d296da 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@1d296da 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:931)
    at com.mysql.jdbc.MysqlIO.checkForOutstandingStreamingData(MysqlIO.java:2518)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1748)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1961)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2537)
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2466)
    at com.mysql.jdbc.StatementImpl.executeQuery(StatementImpl.java:1383)
    at com.mysql.jdbc.ConnectionImpl.getMaxBytesPerChar(ConnectionImpl.java:2939)
    at com.mysql.jdbc.Field.getMaxBytesPerCharacter(Field.java:576)
    at com.mysql.jdbc.ResultSetMetaData.getPrecision(ResultSetMetaData.java:440)
    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)
16/05/20 14:08:06 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)

我在某处读过警告是无害的。

当我执行此命令时，我正在获取输出

$ sqoop list-tables --connect jdbc:mysql://localhost/hadoopguide

输出 - ＆gt;

Warning: /media/akshay/MyMedia/sqoop-1.4.6.bin__hadoop-1.0.0/../hbase does not exist! HBase imports will fail.
Please set $HBASE_HOME to the root of your HBase installation.
Warning: /media/akshay/MyMedia/sqoop-1.4.6.bin__hadoop-1.0.0/../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
Warning: /media/akshay/MyMedia/sqoop-1.4.6.bin__hadoop-1.0.0/../zookeeper does not exist! Accumulo imports will fail.
Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.
16/05/20 14:10:32 INFO sqoop.Sqoop: Running Sqoop version: 1.4.6
16/05/20 14:10:32 INFO manager.MySQLManager: Preparing to use a MySQL streaming resultset.
widgets

请提供一些帮助/建议

Answer 1

确保指定以下参数：

HDFS目录导入数据的位置：

--target-dir $hdfs_path

如果您的Mysql数据库需要用户名和密码：

--username $user --password $pass

如果您还没有这样做，请为您的MySQL路径提供一个端口号：

jdbc:mysql://$server:$port/$database

这应该有帮助！

Answer 2

@akshay naidu：似乎mysql连接器版本不是您使用的最新版本。请查看以下jira链接：

https://issues.apache.org/jira/browse/SQOOP-1400

升级您的连接器，然后尝试。

我的第一个Sqoop工作错误。

2 个答案: