001/**
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019package org.apache.hadoop.mapreduce;
020
021import org.apache.hadoop.classification.InterfaceAudience;
022import org.apache.hadoop.classification.InterfaceStability;
023
024/**
025 * The context that is given to the {@link Mapper}.
026 * @param <KEYIN> the key input type to the Mapper
027 * @param <VALUEIN> the value input type to the Mapper
028 * @param <KEYOUT> the key output type from the Mapper
029 * @param <VALUEOUT> the value output type from the Mapper
030 */
031@InterfaceAudience.Public
032@InterfaceStability.Evolving
033public interface MapContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> 
034  extends TaskInputOutputContext<KEYIN,VALUEIN,KEYOUT,VALUEOUT> {
035
036  /**
037   * Get the input split for this map.
038   */
039  public InputSplit getInputSplit();
040  
041}
042