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    
019    package org.apache.hadoop.mapreduce;
020    
021    import org.apache.hadoop.classification.InterfaceAudience;
022    import 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
033    public 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