hadoop IFileWrappedMapOutput 源码
haddop IFileWrappedMapOutput 代码
文件路径：/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/task/reduce/IFileWrappedMapOutput.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.task.reduce;
import java.io.IOException;
import java.io.InputStream;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.mapred.IFileInputStream;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapreduce.TaskAttemptID;
/**
* Common code for allowing MapOutput classes to handle streams.
*
* @param <K> key type for map output
* @param <V> value type for map output
*/
public abstract class IFileWrappedMapOutput<K, V> extends MapOutput<K, V> {
private final Configuration conf;
private final MergeManagerImpl<K, V> merger;
public IFileWrappedMapOutput(
Configuration c, MergeManagerImpl<K, V> m, TaskAttemptID mapId,
long size, boolean primaryMapOutput) {
super(mapId, size, primaryMapOutput);
conf = c;
merger = m;
}
/**
* @return the merger
*/
protected MergeManagerImpl<K, V> getMerger() {
return merger;
}
protected abstract void doShuffle(
MapHost host, IFileInputStream iFileInputStream,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics, Reporter reporter) throws IOException;
@Override
public void shuffle(MapHost host, InputStream input,
long compressedLength, long decompressedLength,
ShuffleClientMetrics metrics,
Reporter reporter) throws IOException {
doShuffle(host, new IFileInputStream(input, compressedLength, conf),
compressedLength, decompressedLength, metrics, reporter);
}
}
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