hadoop CombineSequenceFileInputFormat 源码
haddop CombineSequenceFileInputFormat 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/CombineSequenceFileInputFormat.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 org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
/**
* Input format that is a <code>CombineFileInputFormat</code>-equivalent for
* <code>SequenceFileInputFormat</code>.
*
* @see CombineFileInputFormat
*/
@InterfaceAudience.Public
@InterfaceStability.Stable
public class CombineSequenceFileInputFormat<K,V>
extends CombineFileInputFormat<K,V> {
@SuppressWarnings({ "rawtypes", "unchecked" })
public RecordReader<K,V> createRecordReader(InputSplit split,
TaskAttemptContext context) throws IOException {
return new CombineFileRecordReader((CombineFileSplit)split, context,
SequenceFileRecordReaderWrapper.class);
}
/**
* A record reader that may be passed to <code>CombineFileRecordReader</code>
* so that it can be used in a <code>CombineFileInputFormat</code>-equivalent
* for <code>SequenceFileInputFormat</code>.
*
* @see CombineFileRecordReader
* @see CombineFileInputFormat
* @see SequenceFileInputFormat
*/
private static class SequenceFileRecordReaderWrapper<K,V>
extends CombineFileRecordReaderWrapper<K,V> {
// this constructor signature is required by CombineFileRecordReader
public SequenceFileRecordReaderWrapper(CombineFileSplit split,
TaskAttemptContext context, Integer idx)
throws IOException, InterruptedException {
super(new SequenceFileInputFormat<K,V>(), split, context, idx);
}
}
}
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