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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