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/mapred/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.mapred;
import java.io.IOException;
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;
/**
* An {@link InputFormat} for {@link SequenceFile}s.
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class SequenceFileInputFormat<K, V> extends FileInputFormat<K, V> {
public SequenceFileInputFormat() {
setMinSplitSize(SequenceFile.SYNC_INTERVAL);
}
@Override
protected FileStatus[] listStatus(JobConf job) throws IOException {
FileStatus[] files = super.listStatus(job);
for (int i = 0; i < files.length; i++) {
FileStatus file = files[i];
if (file.isDirectory()) { // it's a MapFile
Path dataFile = new Path(file.getPath(), MapFile.DATA_FILE_NAME);
FileSystem fs = file.getPath().getFileSystem(job);
// use the data file
files[i] = fs.getFileStatus(dataFile);
}
}
return files;
}
public RecordReader<K, V> getRecordReader(InputSplit split,
JobConf job, Reporter reporter)
throws IOException {
reporter.setStatus(split.toString());
return new SequenceFileRecordReader<K, V>(job, (FileSplit) split);
}
}
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