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.lib; 020 021import org.apache.hadoop.classification.InterfaceAudience; 022import org.apache.hadoop.classification.InterfaceStability; 023import org.apache.hadoop.fs.FileSystem; 024import org.apache.hadoop.mapred.JobConf; 025import org.apache.hadoop.mapred.OutputFormat; 026import org.apache.hadoop.mapred.RecordWriter; 027import org.apache.hadoop.mapred.Reporter; 028import org.apache.hadoop.util.Progressable; 029 030/** 031 * Consume all outputs and put them in /dev/null. 032 */ 033@InterfaceAudience.Public 034@InterfaceStability.Stable 035public class NullOutputFormat<K, V> implements OutputFormat<K, V> { 036 037 public RecordWriter<K, V> getRecordWriter(FileSystem ignored, JobConf job, 038 String name, Progressable progress) { 039 return new RecordWriter<K, V>(){ 040 public void write(K key, V value) { } 041 public void close(Reporter reporter) { } 042 }; 043 } 044 045 public void checkOutputSpecs(FileSystem ignored, JobConf job) { } 046}