Example usage for org.apache.hadoop.mapreduce Job setReducerClass

List of usage examples for org.apache.hadoop.mapreduce Job setReducerClass

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Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce Job setReducerClass.

Prototype

public void setReducerClass(Class<? extends Reducer> cls) throws IllegalStateException

Source Link

Document

Set the Reducer for the job.

Usage

From source file:CrimenCasosTotales.java

public static void main(String args[]) throws Exception {

    Configuration conf = new Configuration();
    Job job = Job.getInstance(conf, "casostotales");
    job.setJarByClass(WordCount.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    job.setMapperClass(Map.class);
    job.setCombinerClass(Reduce.class);
    job.setReducerClass(Reduce.class);

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);

    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:WordCount_NoCombiner.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();

    GenericOptionsParser parser = new GenericOptionsParser(conf, args);
    String[] otherArgs = parser.getRemainingArgs();

    if (otherArgs.length != 2) {
        System.err.println("Usage: wordcount <in> <out>");
        System.exit(2);/*from  w  w w  .j a  va 2  s .  co m*/
    }
    Job job = new Job(conf, "word count");
    job.setJarByClass(WordCount_NoCombiner.class);
    job.setMapperClass(TokenizerMapper.class);

    // delete this line to disable combining
    // job.setCombinerClass(IntSumReducer.class);

    job.setPartitionerClass(WordPartitioner.class);
    job.setNumReduceTasks(5);

    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:Outlinks.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length < 2) {
        System.err.println("Usage: inlinks <in> [<in>...] <out>");
        System.exit(2);/*from w  w  w  .j a  v a2 s  . c o m*/
    }
    Job job = new Job(conf, "inlinks");
    job.setJarByClass(Outlinks.class);
    job.setMapperClass(TokenizerMapper.class);
    //job.setCombinerClass(IdentityReducer.class);
    job.setReducerClass(IdentityReducer.class);
    job.setNumReduceTasks(10);
    job.setOutputKeyClass(IntWritable.class);
    job.setOutputValueClass(IntWritable.class);
    for (int i = 0; i < otherArgs.length - 1; ++i) {
        FileInputFormat.addInputPath(job, new Path(otherArgs[i]));
    }
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[otherArgs.length - 1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:Edge.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2) {
        System.err.println("Usage: wordcount <in> <out>");
        System.exit(2);// w w  w  .ja v a 2s  . c  o  m
    }

    Path tempDir = new Path("/temp/edge");

    Job job = new Job(conf, "word count");
    job.setJarByClass(Edge.class);

    job.setMapperClass(SplitMapper.class);
    job.setCombinerClass(DuplicateCombiner.class);

    //job.setSortComparatorClass(DecentComparator.class);

    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(Text.class);

    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, tempDir);

    if (job.waitForCompletion(true)) {

        Job job2 = new Job(conf, "edge");
        job2.setJarByClass(Edge.class);
        job2.setMapperClass(SwitchMapper.class);
        job2.setSortComparatorClass(DecentComparator.class);
        job2.setReducerClass(SwitchReducer.class);
        job2.setOutputKeyClass(Text.class);
        job2.setOutputValueClass(Text.class);
        FileInputFormat.addInputPath(job2, tempDir);
        FileOutputFormat.setOutputPath(job2, new Path(otherArgs[1]));

        System.exit(job2.waitForCompletion(true) ? 0 : 1);
    }

    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:LinkedGraph.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2) {
        System.err.println("Usage: wordcount <in> <out>");
        System.exit(2);// ww w .  j  a v a 2s  .com
    }
    Job job = new Job(conf, "Graph");
    job.setJarByClass(LinkedGraph.class);
    job.setMapperClass(TokenizerMapper.class);
    job.setCombinerClass(IntSumReducer.class);
    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(Text.class);
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:MarkovStateTransitionModel.java

License:Apache License

@Override
public int run(String[] args) throws Exception {
    Job job = new Job(getConf());
    String jobName = "Markov tate transition model";
    job.setJobName(jobName);//from  w w w  . j av  a  2s  . c  o  m

    job.setJarByClass(MarkovStateTransitionModel.class);

    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    Utility.setConfiguration(job.getConfiguration(), "avenir");
    job.setMapperClass(MarkovStateTransitionModel.StateTransitionMapper.class);
    job.setReducerClass(MarkovStateTransitionModel.StateTransitionReducer.class);
    job.setCombinerClass(MarkovStateTransitionModel.StateTransitionCombiner.class);

    job.setMapOutputKeyClass(Tuple.class);
    job.setMapOutputValueClass(IntWritable.class);

    job.setOutputKeyClass(NullWritable.class);
    job.setOutputValueClass(Text.class);

    job.setNumReduceTasks(job.getConfiguration().getInt("num.reducer", 1));

    int status = job.waitForCompletion(true) ? 0 : 1;
    return status;
}

From source file:DescSorter.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length < 2) {
        System.err.println("Usage: flights <in> <in> <out>");
        System.exit(2);//from  ww  w.  j  a v a2  s . co m
    }
    Job job = new Job(conf, "AvgDelays");
    job.setJarByClass(DescSorter.class);
    job.setMapperClass(FlightMapper.class);

    job.setMapOutputKeyClass(CompositeKey.class);
    job.setMapOutputValueClass(IntWritable.class);

    job.setPartitionerClass(CompositeKeyPartitioner.class);
    job.setSortComparatorClass(SortComparator.class);
    job.setGroupingComparatorClass(GroupingComparator.class);

    job.setReducerClass(AvgDelayReducer.class);
    job.setOutputKeyClass(IntWritable.class);
    job.setOutputValueClass(Text.class);

    for (int i = 0; i < otherArgs.length - 1; ++i) {
        FileInputFormat.addInputPath(job, new Path(otherArgs[i]));
    }
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[otherArgs.length - 1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:CalculateHistogram.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2) {
        System.err.println("Usage: wordcount <in> <out>");
        System.exit(2);/*from www  . j a v  a2  s .c  o m*/
    }

    Job job = new Job(conf, "MRDT - Generate Histogram");
    job.setJarByClass(CalculateHistogram.class);
    job.setMapperClass(HistogramMap.class);
    job.setReducerClass(HistogramReduce.class);

    //job.setOutputValueClass(HistogramBucket.class);

    //job.setMapOutputKeyClass(LongWritable.class);
    //job.setMapOutputValueClass(Text.class);

    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));

    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:MaleUsersBelow7Years.java

public static void main(String args[]) throws Exception {
    Configuration configuration = new Configuration();

    Job job = new Job(configuration, "CountMaleUsersLessThan7");
    job.setJarByClass(MaleUsersBelow7Years.class);
    job.setMapperClass(Map.class);
    job.setReducerClass(Reducer.class);
    job.setCombinerClass(Reducer.class);

    //set output and input formats;mapper-input reducer-output
    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputFormatClass(TextOutputFormat.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(NullWritable.class);

    FileInputFormat.addInputPath(job, new Path(args[0])); //path for input file
    FileOutputFormat.setOutputPath(job, new Path(args[1])); // Path for output file
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}

From source file:PrimeDivisor.java

License:Apache License

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    String[] otherArgs = new GenericOptionsParser(conf, args).getRemainingArgs();
    if (otherArgs.length != 2) {
        System.err.println("Usage: wordcount <in> <out>");
        System.exit(2);//w  ww . j  av  a 2s  .  co  m
    }
    Job job = new Job(conf, "word count");
    job.setJarByClass(PrimeDivisor.class);
    job.setMapperClass(TokenizerMapper.class);
    job.setCombinerClass(IntSumReducer.class);
    job.setReducerClass(IntSumReducer.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);
    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}