net.jarcec.sqoop.data.gen.mr.GeneratorInputFormat.java Source code

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Here is the source code for net.jarcec.sqoop.data.gen.mr.GeneratorInputFormat.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 net.jarcec.sqoop.data.gen.mr;

import net.jarcec.sqoop.data.gen.Constants;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

import java.io.IOException;
import java.util.LinkedList;
import java.util.List;

/**
 * Input format that will generate predefined number of input splits where each
 * split will generated predefined number of lines.
 */
public class GeneratorInputFormat extends InputFormat {
    @Override
    public List<InputSplit> getSplits(JobContext jobContext) throws IOException, InterruptedException {
        Configuration configuration = jobContext.getConfiguration();

        long files = configuration.getLong(Constants.FILES_COUNT, 0);
        long records = configuration.getLong(Constants.RECORD_COUNT, 0);

        List<InputSplit> splits = new LinkedList<InputSplit>();

        long next = 1;
        for (int i = 0; i < files; i++) {
            splits.add(new GeneratorSplit(next, next + records));
            next += records;
        }

        return splits;
    }

    @Override
    public RecordReader createRecordReader(InputSplit inputSplit, TaskAttemptContext taskAttemptContext)
            throws IOException, InterruptedException {
        return new GeneratorRecordReader();
    }
}