/** * 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;}