hadoop PipeMapRunner 源码
haddop PipeMapRunner 代码
文件路径：/hadoop-tools/hadoop-streaming/src/main/java/org/apache/hadoop/streaming/PipeMapRunner.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.streaming;
import org.apache.hadoop.mapred.MapRunner;
import org.apache.hadoop.mapred.Reporter;
import org.apache.hadoop.mapred.RecordReader;
import org.apache.hadoop.mapred.OutputCollector;
import java.io.IOException;
public class PipeMapRunner<K1, V1, K2, V2> extends MapRunner<K1, V1, K2, V2> {
public void run(RecordReader<K1, V1> input, OutputCollector<K2, V2> output,
Reporter reporter)
throws IOException {
PipeMapper pipeMapper = (PipeMapper)getMapper();
pipeMapper.startOutputThreads(output, reporter);
super.run(input, output, reporter);
}
}
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