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.lib.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.mapreduce.InputFormat; 028import org.apache.hadoop.mapreduce.InputSplit; 029import org.apache.hadoop.mapreduce.TaskAttemptContext; 030 031/** 032 * Refinement of InputFormat requiring implementors to provide 033 * ComposableRecordReader instead of RecordReader. 034 */ 035@InterfaceAudience.Public 036@InterfaceStability.Stable 037public abstract class ComposableInputFormat<K extends WritableComparable<?>, 038 V extends Writable> 039 extends InputFormat<K,V> { 040 041 public abstract ComposableRecordReader<K,V> createRecordReader( 042 InputSplit split, TaskAttemptContext context) 043 throws IOException, InterruptedException; 044 045}