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.mapreduce.lib.input;
020
021 import java.io.IOException;
022 import java.util.List;
023
024 import org.apache.hadoop.classification.InterfaceAudience;
025 import org.apache.hadoop.classification.InterfaceStability;
026 import org.apache.hadoop.fs.FileStatus;
027 import org.apache.hadoop.fs.FileSystem;
028 import org.apache.hadoop.fs.Path;
029
030 import org.apache.hadoop.io.SequenceFile;
031 import org.apache.hadoop.io.MapFile;
032 import org.apache.hadoop.mapreduce.InputFormat;
033 import org.apache.hadoop.mapreduce.InputSplit;
034 import org.apache.hadoop.mapreduce.JobContext;
035 import org.apache.hadoop.mapreduce.RecordReader;
036 import org.apache.hadoop.mapreduce.TaskAttemptContext;
037
038 /** An {@link InputFormat} for {@link SequenceFile}s. */
039 @InterfaceAudience.Public
040 @InterfaceStability.Stable
041 public class SequenceFileInputFormat<K, V> extends FileInputFormat<K, V> {
042
043 @Override
044 public RecordReader<K, V> createRecordReader(InputSplit split,
045 TaskAttemptContext context
046 ) throws IOException {
047 return new SequenceFileRecordReader<K,V>();
048 }
049
050 @Override
051 protected long getFormatMinSplitSize() {
052 return SequenceFile.SYNC_INTERVAL;
053 }
054
055 @Override
056 protected List<FileStatus> listStatus(JobContext job
057 )throws IOException {
058
059 List<FileStatus> files = super.listStatus(job);
060 int len = files.size();
061 for(int i=0; i < len; ++i) {
062 FileStatus file = files.get(i);
063 if (file.isDirectory()) { // it's a MapFile
064 Path p = file.getPath();
065 FileSystem fs = p.getFileSystem(job.getConfiguration());
066 // use the data file
067 files.set(i, fs.getFileStatus(new Path(p, MapFile.DATA_FILE_NAME)));
068 }
069 }
070 return files;
071 }
072 }
073