96 lines
3.5 KiB
Java
96 lines
3.5 KiB
Java
/**
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.apache.hadoop.examples;
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import java.io.IOException;
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import java.util.StringTokenizer;
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import org.apache.hadoop.conf.Configuration;
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import org.apache.hadoop.fs.Path;
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import org.apache.hadoop.io.IntWritable;
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import org.apache.hadoop.io.Text;
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import org.apache.hadoop.mapreduce.Job;
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import org.apache.hadoop.mapreduce.Mapper;
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import org.apache.hadoop.mapreduce.Reducer;
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import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
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import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
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import org.apache.hadoop.util.GenericOptionsParser;
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public class WordCount {
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public static class TokenizerMapper
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extends Mapper<Object, Text, Text, IntWritable>{
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private final static IntWritable one = new IntWritable(1);
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private Text word = new Text();
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public void map(Object key, Text value, Context context
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) throws IOException, InterruptedException {
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StringTokenizer itr = new StringTokenizer(value.toString());
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while (itr.hasMoreTokens()) {
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word.set(itr.nextToken());
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context.write(word, one);
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}
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}
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}
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public static class IntSumReducer
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extends Reducer<Text,IntWritable,Text,IntWritable> {
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private IntWritable result = new IntWritable();
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public void reduce(Text key, Iterable<IntWritable> values,
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Context context
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) throws IOException, InterruptedException {
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int sum = 0;
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for (IntWritable val : values) {
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sum += val.get();
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}
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result.set(sum);
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context.write(key, result);
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}
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}
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public static void main(String[] args) throws Exception {
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Configuration conf = new Configuration();
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String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
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if (otherArgs.length != 2) {
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System.err.println("Usage: wordcount <in> <out>");
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System.exit(2);
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}
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// ---- Begin modifications for EDP ----
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// This will add properties from the <configuration> tag specified
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// in the Oozie workflow. For java actions, Oozie writes the
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// configuration values to a file pointed to by ooze.action.conf.xml
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conf.addResource(new Path("file:///",
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System.getProperty("oozie.action.conf.xml")));
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// ---- End modifications for EDP ----
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Job job = new Job(conf, "word count");
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job.setJarByClass(WordCount.class);
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job.setMapperClass(TokenizerMapper.class);
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job.setCombinerClass(IntSumReducer.class);
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job.setReducerClass(IntSumReducer.class);
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job.setOutputKeyClass(Text.class);
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job.setOutputValueClass(IntWritable.class);
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FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
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FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
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System.exit(job.waitForCompletion(true) ? 0 : 1);
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}
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}
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