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    
019    package org.apache.hadoop.mapred;
020    
021    import java.io.IOException;
022    
023    import org.apache.hadoop.classification.InterfaceAudience;
024    import org.apache.hadoop.classification.InterfaceStability;
025    import org.apache.hadoop.fs.FileStatus;
026    import org.apache.hadoop.fs.FileSystem;
027    import org.apache.hadoop.fs.Path;
028    
029    import org.apache.hadoop.io.SequenceFile;
030    import org.apache.hadoop.io.MapFile;
031    
032    /** 
033     * An {@link InputFormat} for {@link SequenceFile}s. 
034     */
035    @InterfaceAudience.Public
036    @InterfaceStability.Stable
037    public 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