001/** 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, software 013 * distributed under the License is distributed on an "AS IS" BASIS, 014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 015 * See the License for the specific language governing permissions and 016 * limitations under the License. 017 */ 018 019package org.apache.hadoop.mapred.lib; 020 021import java.io.IOException; 022 023import org.apache.hadoop.classification.InterfaceAudience; 024import org.apache.hadoop.classification.InterfaceStability; 025import org.apache.hadoop.conf.Configuration; 026import org.apache.hadoop.mapred.InputSplit; 027import org.apache.hadoop.mapred.JobConf; 028import org.apache.hadoop.mapred.RecordReader; 029import org.apache.hadoop.mapred.Reporter; 030import org.apache.hadoop.mapred.SequenceFileInputFormat; 031 032/** 033 * Input format that is a <code>CombineFileInputFormat</code>-equivalent for 034 * <code>SequenceFileInputFormat</code>. 035 * 036 * @see CombineFileInputFormat 037 */ 038@InterfaceAudience.Public 039@InterfaceStability.Stable 040public class CombineSequenceFileInputFormat<K,V> 041 extends CombineFileInputFormat<K,V> { 042 @SuppressWarnings({ "rawtypes", "unchecked" }) 043 public RecordReader<K,V> getRecordReader(InputSplit split, JobConf conf, 044 Reporter reporter) throws IOException { 045 return new CombineFileRecordReader(conf, (CombineFileSplit)split, reporter, 046 SequenceFileRecordReaderWrapper.class); 047 } 048 049 /** 050 * A record reader that may be passed to <code>CombineFileRecordReader</code> 051 * so that it can be used in a <code>CombineFileInputFormat</code>-equivalent 052 * for <code>SequenceFileInputFormat</code>. 053 * 054 * @see CombineFileRecordReader 055 * @see CombineFileInputFormat 056 * @see SequenceFileInputFormat 057 */ 058 private static class SequenceFileRecordReaderWrapper<K,V> 059 extends CombineFileRecordReaderWrapper<K,V> { 060 // this constructor signature is required by CombineFileRecordReader 061 public SequenceFileRecordReaderWrapper(CombineFileSplit split, 062 Configuration conf, Reporter reporter, Integer idx) throws IOException { 063 super(new SequenceFileInputFormat<K,V>(), split, conf, reporter, idx); 064 } 065 } 066}