Example usage for org.apache.hadoop.mapred JobConf setNumReduceTasks

Introduction

In this page you can find the example usage for org.apache.hadoop.mapred JobConf setNumReduceTasks.

Prototype

public void setNumReduceTasks(int n) 

Source Link

Document

Set the requisite number of reduce tasks for this job.

Usage

From source file:edu.umd.cloud9.demo.DemoWordCountJSON.java

License:Apache License

/**
 * Runs this tool.//from   w w w.j a  v  a2s . com
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int numMapTasks = Integer.parseInt(args[2]);
    int numReduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: DemoWordCountJSON");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + numMapTasks);
    sLogger.info(" - number of reducers: " + numReduceTasks);

    JobConf conf = new JobConf(DemoWordCountTuple1.class);
    conf.setJobName("DemoWordCountJSON");

    conf.setNumMapTasks(numMapTasks);
    conf.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    conf.setInputFormat(SequenceFileInputFormat.class);
    conf.setOutputKeyClass(MyKey.class);
    conf.setOutputValueClass(IntWritable.class);
    conf.setOutputFormat(SequenceFileOutputFormat.class);

    conf.setMapperClass(MyMapper.class);
    conf.setCombinerClass(MyReducer.class);
    conf.setReducerClass(MyReducer.class);

    // Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.demo.DemoWordCountTuple1.java

License:Apache License

/**
 * Runs this tool.//  w ww.j  a  v  a  2 s.co m
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int numMapTasks = Integer.parseInt(args[2]);
    int numReduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: DemoWordCountTuple1");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + numMapTasks);
    sLogger.info(" - number of reducers: " + numReduceTasks);

    JobConf conf = new JobConf(DemoWordCountTuple1.class);
    conf.setJobName("DemoWordCountTuple1");

    conf.setNumMapTasks(numMapTasks);
    conf.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    conf.setInputFormat(SequenceFileInputFormat.class);
    conf.setOutputKeyClass(Tuple.class);
    conf.setOutputValueClass(IntWritable.class);
    conf.setOutputFormat(SequenceFileOutputFormat.class);

    conf.setMapperClass(MyMapper.class);
    conf.setCombinerClass(MyReducer.class);
    conf.setReducerClass(MyReducer.class);

    // Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.demo.DemoWordCountTuple2.java

License:Apache License

/**
 * Runs this tool./*  ww w  .  jav a  2  s .c o m*/
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int numMapTasks = Integer.parseInt(args[2]);
    int numReduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: DemoWordCountTuple2");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + numMapTasks);
    sLogger.info(" - number of reducers: " + numReduceTasks);

    JobConf conf = new JobConf(DemoWordCountTuple2.class);
    conf.setJobName("DemoWordCountTuple2");

    conf.setNumMapTasks(numMapTasks);
    conf.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    conf.setInputFormat(SequenceFileInputFormat.class);
    conf.setOutputKeyClass(Tuple.class);
    conf.setOutputValueClass(IntWritable.class);
    conf.setOutputFormat(SequenceFileOutputFormat.class);

    conf.setMapperClass(MapClass.class);
    conf.setCombinerClass(ReduceClass.class);
    conf.setReducerClass(ReduceClass.class);

    // Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.example.simple.DemoMapredNullInput.java

License:Apache License

/**
 * Runs the demo./*from w  w w. j a va2 s . c  o  m*/
 */
public static void main(String[] args) throws IOException {
    JobConf conf = new JobConf(DemoMapredNullInput.class);
    conf.setJobName("DemoMapredNullInput");

    conf.setNumMapTasks(10);
    conf.setNumReduceTasks(0);

    conf.setInputFormat(NullInputFormat.class);
    conf.setOutputFormat(NullOutputFormat.class);
    conf.setMapperClass(MyMapper.class);

    JobClient.runJob(conf);
}

---

From source file:edu.umd.cloud9.example.simple.DemoNullInput.java

License:Apache License

/**
 * Runs the demo./*ww  w  .j  a va  2 s.c o m*/
 */
public static void main(String[] args) throws IOException {
    JobConf conf = new JobConf(DemoNullInput.class);
    conf.setJobName("DemoNullInput");

    conf.setNumMapTasks(10);
    conf.setNumReduceTasks(0);

    conf.setInputFormat(NullInputFormat.class);
    conf.setOutputFormat(NullOutputFormat.class);
    conf.setMapperClass(MyMapper.class);

    JobClient.runJob(conf);
}

---

From source file:edu.umd.cloud9.examples.BigramCount.java

License:Apache License

/**
 * Runs this tool./*  w w  w. ja  v  a2 s.c  om*/
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int mapTasks = Integer.parseInt(args[2]);
    int reduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: BigramCount");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + mapTasks);
    sLogger.info(" - number of reducers: " + reduceTasks);

    JobConf conf = new JobConf(BigramCount.class);
    conf.setJobName("BigramCount");

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    /**
     *  Note that these must match the Class arguments given in the mapper 
     */
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(IntWritable.class);

    conf.setMapperClass(MyMapper.class);
    conf.setCombinerClass(MyReducer.class);
    conf.setReducerClass(MyReducer.class);

    // Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(outputDir.toUri(), conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.examples.BigramRelativeFrequency.java

License:Apache License

/**
 * Runs this tool./*www .  j  av a  2  s .c o  m*/
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int mapTasks = Integer.parseInt(args[2]);
    int reduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: BigramRelativeFrequency");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + mapTasks);
    sLogger.info(" - number of reducers: " + reduceTasks);

    JobConf conf = new JobConf(BigramRelativeFrequency.class);
    conf.setJobName("BigramRelativeFrequency");

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    /**
     *  Note that these must match the Class arguments given in the mapper 
     */
    conf.setOutputKeyClass(PairOfStrings.class);
    conf.setOutputValueClass(FloatWritable.class);

    conf.setMapperClass(MyMapper.class);
    conf.setCombinerClass(MyCombiner.class);
    conf.setReducerClass(MyReducer.class);
    conf.setPartitionerClass(MyPartitioner.class);

    //Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(outputDir.toUri(), conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.examples.BuildInvertedIndex.java

License:Apache License

/**
 * Runs this tool./*w  w  w. j a  va  2  s .c o  m*/
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int mapTasks = Integer.parseInt(args[2]);
    int reduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: BuildInvertedIndex");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + mapTasks);
    sLogger.info(" - number of reducers: " + reduceTasks);

    JobConf conf = new JobConf(BuildInvertedIndex.class);
    conf.setJobName("BuildInvertedIndex");

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    /**
     *  Note that these must match the Class arguments given in the mapper 
     */
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(PairOfInts.class);

    conf.setMapperClass(MyMapper.class);
    conf.setReducerClass(MyReducer.class);

    // Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(outputDir.toUri(), conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.examples.DemoWordCount.java

License:Apache License

/**
 * Runs this tool.//from   w ww  .j  a v a  2 s. c  o m
 */
public int run(String[] args) throws Exception {
    if (args.length != 4) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];

    int mapTasks = Integer.parseInt(args[2]);
    int reduceTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: DemoWordCount");
    sLogger.info(" - input path: " + inputPath);
    sLogger.info(" - output path: " + outputPath);
    sLogger.info(" - number of mappers: " + mapTasks);
    sLogger.info(" - number of reducers: " + reduceTasks);

    JobConf conf = new JobConf(DemoWordCount.class);
    conf.setJobName("DemoWordCount");

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));
    FileOutputFormat.setOutputPath(conf, new Path(outputPath));
    FileOutputFormat.setCompressOutput(conf, false);

    /**
     *  Note that these must match the Class arguments given in the mapper 
     */
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(IntWritable.class);

    conf.setMapperClass(MyMapper.class);
    conf.setCombinerClass(MyReducer.class);
    conf.setReducerClass(MyReducer.class);

    // Delete the output directory if it exists already
    Path outputDir = new Path(outputPath);
    FileSystem.get(outputDir.toUri(), conf).delete(outputDir, true);

    long startTime = System.currentTimeMillis();
    JobClient.runJob(conf);
    sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.examples.JingBigramRelativeFrequency.java

License:Apache License

/**
  * Runs this tool./* ww  w .  j av  a  2s. c  om*/
  */
 public int run(String[] args) throws Exception {
     if (args.length != 4) {
         printUsage();
         return -1;
     }

     String inputPath = args[0];
     String outputPath = args[1];

     int mapTasks = Integer.parseInt(args[2]);
     int reduceTasks = Integer.parseInt(args[3]);

     sLogger.info("Tool: DemoWordCount");
     sLogger.info(" - input path: " + inputPath);
     sLogger.info(" - output path: " + outputPath);
     sLogger.info(" - number of mappers: " + mapTasks);
     sLogger.info(" - number of reducers: " + reduceTasks);

     JobConf conf = new JobConf(BigramRelativeFrequency.class);
     conf.setJobName("DemoWordCount");

     conf.setNumMapTasks(mapTasks);
     conf.setNumReduceTasks(reduceTasks);

     FileInputFormat.setInputPaths(conf, new Path(inputPath));
     FileOutputFormat.setOutputPath(conf, new Path(outputPath));
     FileOutputFormat.setCompressOutput(conf, false);

     /**
      *  Note that these must match the Class arguments given in the mapper 
      */
     conf.setOutputKeyClass(Text.class);
     conf.setOutputValueClass(IntWritable.class);

     conf.setMapperClass(MyMapper.class);
     conf.setCombinerClass(MyReducer.class);
     conf.setReducerClass(MyReducer.class);

     // Delete the output directory if it exists already
     Path outputDir = new Path(outputPath);
     FileSystem.get(outputDir.toUri(), conf).delete(outputDir, true);

     long startTime = System.currentTimeMillis();
     JobClient.runJob(conf);
     sLogger.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");
     return 0;
 }

---

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