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 testjar; |
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20 | |
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21 | import java.io.IOException; |
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22 | import java.util.Iterator; |
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23 | |
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24 | import org.apache.hadoop.io.IntWritable; |
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25 | import org.apache.hadoop.io.Text; |
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26 | import org.apache.hadoop.io.Writable; |
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27 | import org.apache.hadoop.io.WritableComparable; |
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28 | import org.apache.hadoop.mapred.JobConf; |
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29 | import org.apache.hadoop.mapred.Mapper; |
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30 | import org.apache.hadoop.mapred.OutputCollector; |
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31 | import org.apache.hadoop.mapred.Reducer; |
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32 | import org.apache.hadoop.mapred.Reporter; |
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33 | |
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34 | public class ExternalMapperReducer |
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35 | implements Mapper<WritableComparable, Writable, |
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36 | ExternalWritable, IntWritable>, |
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37 | Reducer<WritableComparable, Writable, |
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38 | WritableComparable, IntWritable> { |
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39 | |
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40 | public void configure(JobConf job) { |
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41 | |
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42 | } |
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43 | |
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44 | public void close() |
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45 | throws IOException { |
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46 | |
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47 | } |
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48 | |
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49 | public void map(WritableComparable key, Writable value, |
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50 | OutputCollector<ExternalWritable, IntWritable> output, |
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51 | Reporter reporter) |
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52 | throws IOException { |
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53 | |
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54 | if (value instanceof Text) { |
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55 | Text text = (Text)value; |
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56 | ExternalWritable ext = new ExternalWritable(text.toString()); |
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57 | output.collect(ext, new IntWritable(1)); |
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58 | } |
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59 | } |
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60 | |
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61 | public void reduce(WritableComparable key, Iterator<Writable> values, |
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62 | OutputCollector<WritableComparable, IntWritable> output, |
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63 | Reporter reporter) |
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64 | throws IOException { |
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65 | |
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66 | int count = 0; |
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67 | while (values.hasNext()) { |
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68 | count++; |
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69 | values.next(); |
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70 | } |
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71 | output.collect(key, new IntWritable(count)); |
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72 | } |
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73 | } |
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