?? maprunnable.java
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/** * Copyright 2005 The Apache Software Foundation * * Licensed 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;/** Expert: Permits greater control of map processing. For example, * implementations might perform multi-threaded, asynchronous mappings. */public interface MapRunnable extends JobConfigurable { /** Called to execute mapping. Mapping is complete when this returns. * @param input the {@link RecordReader} with input key/value pairs. * @param output the {@link OutputCollector} for mapped key/value pairs. */ void run(RecordReader input, OutputCollector output, Reporter reporter) throws IOException;}
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