我是cloudera环境的新手，我正在尝试使用sqoop从rdbms导入数据，并且需要在导入期间对数据应用一些转换。具体来说，我需要加密一些字段，然后再将它们存储在hadoop dfs上。为了实现这一点，我尝试使用codegen命令，它生成一个我可以修改的ormjava类。
假设我在mysql数据库上有一个表'products'，我想使用sqoop在hdfs上导入它并加密'brand'字段。首先，我运行了以下命令：

sqoop codegen \ 
--connect jdbc:mysql://localhost/test \
--username username --password password \
--table products

这将在/tmp/sqoop training/compile/fc8868dda33ef703ad126583cf77477f文件夹中生成文件products.java、products.jar和products.class。
现在我修改了products.java中的readfields方法，如下所示：

// WARNING: This class is AUTO-GENERATED. Modify at your own risk.
//
// Debug information:
// Generated date: Thu Nov 16 06:55:13 PST 2017
// For connector: org.apache.sqoop.manager.MySQLManager
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.mapred.lib.db.DBWritable;
import com.cloudera.sqoop.lib.JdbcWritableBridge;
import com.cloudera.sqoop.lib.DelimiterSet;
import com.cloudera.sqoop.lib.FieldFormatter;
import com.cloudera.sqoop.lib.RecordParser;
import com.cloudera.sqoop.lib.BooleanParser;
import com.cloudera.sqoop.lib.BlobRef;
import com.cloudera.sqoop.lib.ClobRef;
import com.cloudera.sqoop.lib.LargeObjectLoader;
import com.cloudera.sqoop.lib.SqoopRecord;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

public class products extends SqoopRecord  implements DBWritable, Writable {

    // [...]

    public void readFields(ResultSet __dbResults) throws SQLException {
        this.__cur_result_set = __dbResults;
        this.prod_id = JdbcWritableBridge.readInteger(1, __dbResults);
        this.brand = encrypt(JdbcWritableBridge.readString(2, __dbResults));
        this.name = JdbcWritableBridge.readString(3, __dbResults);
        this.price = JdbcWritableBridge.readInteger(4, __dbResults);
        this.cost = JdbcWritableBridge.readInteger(5, __dbResults);
        this.shipping_wt = JdbcWritableBridge.readInteger(6, __dbResults);
    }

    // [...]

}

我有两个问题：
1） 如何重新编译products.java以获得products.class和products.jar的更新版本？我试过了

javac products.java

但是jvm给出了82个错误，似乎找不到来自hadoop和cloudera命名空间的包：

error: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.BytesWritable;
                           ^
products.java:8: error: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.Text;
                           ^
products.java:9: error: package org.apache.hadoop.io does not exist
import org.apache.hadoop.io.Writable;
                           ^
products.java:10: error: package org.apache.hadoop.mapred.lib.db does not exist
import org.apache.hadoop.mapred.lib.db.DBWritable;
                                      ^
products.java:11: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.JdbcWritableBridge;
                             ^
products.java:12: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.DelimiterSet;
                             ^
products.java:13: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.FieldFormatter;
                             ^
products.java:14: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.RecordParser;
                             ^
products.java:15: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.BooleanParser;
                             ^
products.java:16: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.BlobRef;
                             ^
products.java:17: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.ClobRef;
                             ^
products.java:18: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.LargeObjectLoader;
                             ^
products.java:19: error: package com.cloudera.sqoop.lib does not exist
import com.cloudera.sqoop.lib.SqoopRecord;

2） 一旦我成功地编译了products.java，我如何使用sqoop使用我的定制orm类导入hdfs上的数据？
提前谢谢！