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.mapred.join;
020
021import java.io.IOException;
022
023import org.apache.hadoop.classification.InterfaceAudience;
024import org.apache.hadoop.classification.InterfaceStability;
025import org.apache.hadoop.io.Writable;
026import org.apache.hadoop.io.WritableComparable;
027import org.apache.hadoop.mapred.InputFormat;
028import org.apache.hadoop.mapred.InputSplit;
029import org.apache.hadoop.mapred.JobConf;
030import org.apache.hadoop.mapred.Reporter;
031
032/**
033 * Refinement of InputFormat requiring implementors to provide
034 * ComposableRecordReader instead of RecordReader.
035 */
036@InterfaceAudience.Public
037@InterfaceStability.Stable
038public interface ComposableInputFormat<K extends WritableComparable,
039                                       V extends Writable>
040    extends InputFormat<K,V> {
041
042  ComposableRecordReader<K,V> getRecordReader(InputSplit split,
043      JobConf job, Reporter reporter) throws IOException;
044}