/**
 * 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 com.savy3.mapreduce;

import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import java.io.IOException;

import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.BytesWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;

/**
 * MainframeVBInputFormat is an input format used to read input files from
 * mainframe VB files. The content of a record need to be binary data. Users
 * must configure the record by FTPing the data with RDW bytes
 */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class MainframeVBInputFormat extends
		FileInputFormat<LongWritable, BytesWritable> {

	@Override
	public RecordReader<LongWritable, BytesWritable> createRecordReader(
			InputSplit split, TaskAttemptContext context) throws IOException,
			InterruptedException {
		return new MainframeVBRecordReader();
	}

	@Override
	protected boolean isSplitable(JobContext context, Path file) {
		return true;
	}

}

Create MainframeVBInputFormat.java