hadoop SequenceFileInputFormat 源码
haddop SequenceFileInputFormat 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/lib/input/SequenceFileInputFormat.java
/**
* 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 org.apache.hadoop.mapreduce.lib.input;
import java.io.IOException;
import java.util.List;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.fs.FileStatus;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.SequenceFile;
import org.apache.hadoop.io.MapFile;
import org.apache.hadoop.mapreduce.InputFormat;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
/** An {@link InputFormat} for {@link SequenceFile}s. */
@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileInputFormat<K, V> extends FileInputFormat<K, V> {
@Override
public RecordReader<K, V> createRecordReader(InputSplit split,
TaskAttemptContext context
) throws IOException {
return new SequenceFileRecordReader<K,V>();
}
@Override
protected long getFormatMinSplitSize() {
return SequenceFile.SYNC_INTERVAL;
}
@Override
protected List<FileStatus> listStatus(JobContext job
)throws IOException {
List<FileStatus> files = super.listStatus(job);
int len = files.size();
for(int i=0; i < len; ++i) {
FileStatus file = files.get(i);
if (file.isDirectory()) { // it's a MapFile
Path p = file.getPath();
FileSystem fs = p.getFileSystem(job.getConfiguration());
// use the data file
files.set(i, fs.getFileStatus(new Path(p, MapFile.DATA_FILE_NAME)));
}
}
return files;
}
}
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