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;
020
021import java.io.IOException;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025import org.apache.hadoop.fs.FileStatus;
026import org.apache.hadoop.fs.FileSystem;
027import org.apache.hadoop.fs.Path;
028
029import org.apache.hadoop.io.SequenceFile;
030import org.apache.hadoop.io.MapFile;
031
032/** 
033 * An {@link InputFormat} for {@link SequenceFile}s. 
034 */
035@InterfaceAudience.Public
036@InterfaceStability.Stable
037public class SequenceFileInputFormat<K, V> extends FileInputFormat<K, V> {
038
039  public SequenceFileInputFormat() {
040    setMinSplitSize(SequenceFile.SYNC_INTERVAL);
041  }
042  
043  @Override
044  protected FileStatus[] listStatus(JobConf job) throws IOException {
045    FileStatus[] files = super.listStatus(job);
046    for (int i = 0; i < files.length; i++) {
047      FileStatus file = files[i];
048      if (file.isDirectory()) {     // it's a MapFile
049        Path dataFile = new Path(file.getPath(), MapFile.DATA_FILE_NAME);
050        FileSystem fs = file.getPath().getFileSystem(job);
051        // use the data file
052        files[i] = fs.getFileStatus(dataFile);
053      }
054    }
055    return files;
056  }
057
058  public RecordReader<K, V> getRecordReader(InputSplit split,
059                                      JobConf job, Reporter reporter)
060    throws IOException {
061
062    reporter.setStatus(split.toString());
063
064    return new SequenceFileRecordReader<K, V>(job, (FileSplit) split);
065  }
066
067}
068