[120] | 1 | /** |
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| 2 | * Licensed to the Apache Software Foundation (ASF) under one |
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| 3 | * or more contributor license agreements. See the NOTICE file |
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| 4 | * distributed with this work for additional information |
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| 5 | * regarding copyright ownership. The ASF licenses this file |
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| 6 | * to you under the Apache License, Version 2.0 (the |
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| 7 | * "License"); you may not use this file except in compliance |
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| 8 | * with the License. You may obtain a copy of the License at |
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| 9 | * |
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| 10 | * http://www.apache.org/licenses/LICENSE-2.0 |
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| 11 | * |
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| 12 | * Unless required by applicable law or agreed to in writing, software |
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| 13 | * distributed under the License is distributed on an "AS IS" BASIS, |
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| 14 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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| 15 | * See the License for the specific language governing permissions and |
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| 16 | * limitations under the License. |
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| 17 | */ |
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| 18 | |
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| 19 | package org.apache.hadoop.mapreduce.lib.output; |
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| 20 | |
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| 21 | import org.apache.hadoop.mapreduce.JobContext; |
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| 22 | import org.apache.hadoop.mapreduce.OutputCommitter; |
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| 23 | import org.apache.hadoop.mapreduce.OutputFormat; |
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| 24 | import org.apache.hadoop.mapreduce.RecordWriter; |
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| 25 | import org.apache.hadoop.mapreduce.TaskAttemptContext; |
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| 26 | |
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| 27 | /** |
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| 28 | * Consume all outputs and put them in /dev/null. |
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| 29 | */ |
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| 30 | public class NullOutputFormat<K, V> extends OutputFormat<K, V> { |
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| 31 | |
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| 32 | @Override |
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| 33 | public RecordWriter<K, V> |
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| 34 | getRecordWriter(TaskAttemptContext context) { |
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| 35 | return new RecordWriter<K, V>(){ |
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| 36 | public void write(K key, V value) { } |
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| 37 | public void close(TaskAttemptContext context) { } |
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| 38 | }; |
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| 39 | } |
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| 40 | |
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| 41 | @Override |
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| 42 | public void checkOutputSpecs(JobContext context) { } |
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| 43 | |
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| 44 | @Override |
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| 45 | public OutputCommitter getOutputCommitter(TaskAttemptContext context) { |
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| 46 | return new OutputCommitter() { |
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| 47 | public void abortTask(TaskAttemptContext taskContext) { } |
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| 48 | public void cleanupJob(JobContext jobContext) { } |
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| 49 | public void commitTask(TaskAttemptContext taskContext) { } |
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| 50 | public boolean needsTaskCommit(TaskAttemptContext taskContext) { |
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| 51 | return false; |
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| 52 | } |
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| 53 | public void setupJob(JobContext jobContext) { } |
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| 54 | public void setupTask(TaskAttemptContext taskContext) { } |
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| 55 | }; |
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| 56 | } |
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| 57 | } |
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