com.cloudera.sqoop.mapreduce.TextImportMapper.java Source code

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Here is the source code for com.cloudera.sqoop.mapreduce.TextImportMapper.java

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/**
 * Licensed to Cloudera, Inc. under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  Cloudera, Inc. licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.cloudera.sqoop.mapreduce;

import java.io.IOException;
import java.sql.SQLException;

import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.NullWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Mapper.Context;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import com.cloudera.sqoop.lib.LargeObjectLoader;
import com.cloudera.sqoop.lib.SqoopRecord;

/**
 * Imports records by transforming them to strings for a plain-text flat file.
 */
public class TextImportMapper extends AutoProgressMapper<LongWritable, SqoopRecord, Text, NullWritable> {

    private Text outkey;
    private LargeObjectLoader lobLoader;

    public TextImportMapper() {
        outkey = new Text();
    }

    @Override
    protected void setup(Context context) throws IOException, InterruptedException {
        this.lobLoader = new LargeObjectLoader(context.getConfiguration(),
                FileOutputFormat.getWorkOutputPath(context));
    }

    @Override
    public void map(LongWritable key, SqoopRecord val, Context context) throws IOException, InterruptedException {

        try {
            // Loading of LOBs was delayed until we have a Context.
            val.loadLargeObjects(lobLoader);
        } catch (SQLException sqlE) {
            throw new IOException(sqlE);
        }

        outkey.set(val.toString());
        context.write(outkey, NullWritable.get());
    }

    @Override
    protected void cleanup(Context context) throws IOException {
        if (null != lobLoader) {
            lobLoader.close();
        }
    }
}