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

Introduction

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

Prototype

@Deprecated
public static Job getInstance(Cluster ignored) throws IOException 

Source Link

Document

Creates a new Job with no particular Cluster .

Usage

From source file:edu.umd.cloud9.example.bigram.BigramRelativeFrequencyTuple.java

License:Apache License

/**
 * Runs this tool.//from   w  w w .j  av  a  2 s  .  c om
 */
@SuppressWarnings({ "static-access" })
public int run(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("output path").create(OUTPUT));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of reducers")
            .create(NUM_REDUCERS));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();

    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
        System.out.println("args: " + Arrays.toString(args));
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String inputPath = cmdline.getOptionValue(INPUT);
    String outputPath = cmdline.getOptionValue(OUTPUT);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;

    LOG.info("Tool name: " + BigramRelativeFrequencyTuple.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - num reducers: " + reduceTasks);

    Job job = Job.getInstance(getConf());
    job.setJobName(BigramRelativeFrequencyTuple.class.getSimpleName());
    job.setJarByClass(BigramRelativeFrequencyTuple.class);

    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

    job.setMapOutputKeyClass(BinSedesTuple.class);
    job.setMapOutputValueClass(FloatWritable.class);
    job.setOutputKeyClass(BinSedesTuple.class);
    job.setOutputValueClass(FloatWritable.class);
    job.setOutputFormatClass(SequenceFileOutputFormat.class);

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

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

    long startTime = System.currentTimeMillis();
    job.waitForCompletion(true);
    System.out.println("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.example.clustering.IterateGMM.java

License:Apache License

/**
 * Runs this tool.//from   ww  w . j  ava2 s .  co m
 */
@SuppressWarnings({ "static-access" })
public int run(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("output path").create(OUTPUT));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of reducers")
            .create(NUM_REDUCERS));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();

    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
        System.out.println("args: " + Arrays.toString(args));
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String inputPath0 = cmdline.getOptionValue(INPUT);
    String outputPath = cmdline.getOptionValue(OUTPUT);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;

    LOG.info("Tool: " + IterateGMM.class.getSimpleName());
    LOG.info(" - input path: " + inputPath0);
    String inputPath = inputPath0 + "/points";
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - number of reducers: " + reduceTasks);

    int iterations = 0;
    Configuration conf = getConf();

    while (iterations == 0 || !FinishIteration(inputPath0, iterations, conf)) {
        LOG.info("** iterations: " + iterations);
        try {

            Job job = Job.getInstance(conf);
            job.setJobName(IterateGMM.class.getSimpleName());
            job.setJarByClass(IterateGMM.class);
            // set the path of the information of k clusters in this iteration
            job.getConfiguration().set("clusterpath", inputPath0 + "/cluster" + iterations);
            job.setNumReduceTasks(reduceTasks);

            FileInputFormat.setInputPaths(job, new Path(inputPath));
            FileOutputFormat.setOutputPath(job, new Path(outputPath));

            job.setMapOutputKeyClass(Text.class);
            job.setMapOutputValueClass(PairOfStrings.class);
            job.setOutputKeyClass(Text.class);
            job.setOutputValueClass(Text.class);

            job.setMapperClass(MyMapper.class);
            job.setReducerClass(MyReducer.class);
            job.setPartitionerClass(MyPartitioner.class);

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

            long startTime = System.currentTimeMillis();
            job.waitForCompletion(true);
            LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

            reNameFile(inputPath0, outputPath, iterations + 1, conf, reduceTasks);
        } catch (Exception exp) {
            exp.printStackTrace();
        }
        iterations++;
    }

    return 0;
}

---

From source file:edu.umd.cloud9.example.cooccur.ComputeCooccurrenceMatrixStripes.java

License:Apache License

/**
 * Runs this tool./* w ww  .  j a  v  a  2 s. c o m*/
 */
@SuppressWarnings({ "static-access" })
public int run(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("output path").create(OUTPUT));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("window size").create(WINDOW));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of reducers")
            .create(NUM_REDUCERS));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();

    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
        System.out.println("args: " + Arrays.toString(args));
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String inputPath = cmdline.getOptionValue(INPUT);
    String outputPath = cmdline.getOptionValue(OUTPUT);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;
    int window = cmdline.hasOption(WINDOW) ? Integer.parseInt(cmdline.getOptionValue(WINDOW)) : 2;

    LOG.info("Tool: " + ComputeCooccurrenceMatrixStripes.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - window: " + window);
    LOG.info(" - number of reducers: " + reduceTasks);

    Job job = Job.getInstance(getConf());
    job.setJobName(ComputeCooccurrenceMatrixStripes.class.getSimpleName());
    job.setJarByClass(ComputeCooccurrenceMatrixStripes.class);

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

    job.getConfiguration().setInt("window", window);

    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

    job.setMapOutputKeyClass(Text.class);
    job.setOutputValueClass(HMapSIW.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(HMapSIW.class);

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

    long startTime = System.currentTimeMillis();
    job.waitForCompletion(true);
    System.out.println("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.example.hbase.HBaseWordCount.java

License:Apache License

/**
 * Runs this tool./*w  ww  .  j  a v  a2  s.c o  m*/
 */
@SuppressWarnings({ "static-access" })
public int run(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT));
    options.addOption(
            OptionBuilder.withArgName("table").hasArg().withDescription("HBase table name").create(OUTPUT));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of reducers")
            .create(NUM_REDUCERS));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();

    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
        System.out.println("args: " + Arrays.toString(args));
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String inputPath = cmdline.getOptionValue(INPUT);
    String outputTable = cmdline.getOptionValue(OUTPUT);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;

    // If the table doesn't already exist, create it.
    Configuration conf = getConf();
    conf.addResource(new Path("/etc/hbase/conf/hbase-site.xml"));

    Configuration hbaseConfig = HBaseConfiguration.create(conf);
    HBaseAdmin admin = new HBaseAdmin(hbaseConfig);

    if (admin.tableExists(outputTable)) {
        LOG.info(String.format("Table '%s' exists: dropping table and recreating.", outputTable));
        LOG.info(String.format("Disabling table '%s'", outputTable));
        admin.disableTable(outputTable);
        LOG.info(String.format("Droppping table '%s'", outputTable));
        admin.deleteTable(outputTable);
    }

    HTableDescriptor tableDesc = new HTableDescriptor(TableName.valueOf(outputTable));
    for (int i = 0; i < FAMILIES.length; i++) {
        HColumnDescriptor hColumnDesc = new HColumnDescriptor(FAMILIES[i]);
        tableDesc.addFamily(hColumnDesc);
    }
    admin.createTable(tableDesc);
    LOG.info(String.format("Successfully created table '%s'", outputTable));

    admin.close();

    // Now we're ready to start running MapReduce.
    LOG.info("Tool: " + HBaseWordCount.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output table: " + outputTable);
    LOG.info(" - number of reducers: " + reduceTasks);

    Job job = Job.getInstance(conf);
    job.setJobName(HBaseWordCount.class.getSimpleName());
    job.setJarByClass(HBaseWordCount.class);

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

    job.setMapperClass(MyMapper.class);
    job.setCombinerClass(MyReducer.class);
    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    TableMapReduceUtil.initTableReducerJob(outputTable, MyTableReducer.class, job);

    long startTime = System.currentTimeMillis();
    job.waitForCompletion(true);
    LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.example.ir.BuildInvertedIndex.java

License:Apache License

/**
 * Runs this tool./*from w w w .j ava  2  s  .  c o  m*/
 */
@SuppressWarnings({ "static-access" })
public int run(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("output path").create(OUTPUT));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of reducers")
            .create(NUM_REDUCERS));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();

    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
        System.out.println("args: " + Arrays.toString(args));
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String inputPath = cmdline.getOptionValue(INPUT);
    String outputPath = cmdline.getOptionValue(OUTPUT);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;

    LOG.info("Tool name: " + BuildInvertedIndex.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - num reducers: " + reduceTasks);

    Job job = Job.getInstance(getConf());
    job.setJobName(BuildInvertedIndex.class.getSimpleName());
    job.setJarByClass(BuildInvertedIndex.class);

    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(PairOfInts.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(PairOfWritables.class);
    job.setOutputFormatClass(MapFileOutputFormat.class);

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

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

    long startTime = System.currentTimeMillis();
    job.waitForCompletion(true);
    System.out.println("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

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

License:Apache License

/**
 * Runs the demo./*  ww w . j a va2 s  .  c o m*/
 */
public static void main(String[] args) throws IOException, InterruptedException, ClassNotFoundException {
    Job job = Job.getInstance(new Configuration());
    job.setJobName(DemoMapreduceNullInput.class.getSimpleName());
    job.setJarByClass(DemoMapreduceNullInput.class);

    job.setNumReduceTasks(0);
    job.setInputFormatClass(NullInputFormat.class);
    job.setOutputFormatClass(NullOutputFormat.class);
    job.setMapperClass(MyMapper.class);

    job.waitForCompletion(true);
}

---

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

License:Apache License

/**
 * Runs this tool.//from  w  w  w  .  j  ava  2s .  c o m
 */
public int run(String[] args) throws Exception {
    if (args.length != 3) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];
    int numReduceTasks = Integer.parseInt(args[2]);

    LOG.info("Tool: " + DemoWordCountJson.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - number of reducers: " + numReduceTasks);

    Configuration conf = getConf();
    Job job = Job.getInstance(conf);
    job.setJobName(DemoWordCountJson.class.getSimpleName());
    job.setJarByClass(DemoWordCountJson.class);
    job.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

    job.setInputFormatClass(SequenceFileInputFormat.class);
    job.setOutputFormatClass(SequenceFileOutputFormat.class);

    job.setOutputKeyClass(MyKey.class);
    job.setOutputValueClass(IntWritable.class);

    job.setMapperClass(MyMapper.class);
    job.setCombinerClass(MyReducer.class);
    job.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();
    job.waitForCompletion(true);
    LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.example.simple.DemoWordCountTuple1.java

License:Apache License

/**
 * Runs this tool./* w  w w.j a va 2s  . c  o m*/
 */
public int run(String[] args) throws Exception {
    if (args.length != 3) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];
    int numReduceTasks = Integer.parseInt(args[2]);

    LOG.info("Tool: " + DemoWordCountTuple1.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - number of reducers: " + numReduceTasks);

    Configuration conf = getConf();
    Job job = Job.getInstance(conf);
    job.setJobName(DemoWordCountTuple1.class.getSimpleName());
    job.setJarByClass(DemoWordCountTuple1.class);
    job.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

    job.setInputFormatClass(SequenceFileInputFormat.class);
    job.setOutputFormatClass(SequenceFileOutputFormat.class);
    job.setOutputKeyClass(PairOfStringInt.class);
    job.setOutputValueClass(IntWritable.class);

    job.setMapperClass(MyMapper.class);
    job.setCombinerClass(MyReducer.class);
    job.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();
    job.waitForCompletion(true);
    LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

From source file:edu.umd.cloud9.example.simple.DemoWordCountTuple2.java

License:Apache License

/**
 * Runs this tool.//from w  w  w. j  av  a2s  .c  o m
 */
public int run(String[] args) throws Exception {
    if (args.length != 3) {
        printUsage();
        return -1;
    }

    String inputPath = args[0];
    String outputPath = args[1];
    int numReduceTasks = Integer.parseInt(args[2]);

    LOG.info("Tool: " + DemoWordCountTuple2.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - number of reducers: " + numReduceTasks);

    Configuration conf = getConf();
    Job job = Job.getInstance(conf);
    job.setJobName(DemoWordCountTuple2.class.getSimpleName());
    job.setJarByClass(DemoWordCountTuple2.class);
    job.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

    job.setInputFormatClass(SequenceFileInputFormat.class);
    job.setOutputFormatClass(SequenceFileOutputFormat.class);
    job.setOutputKeyClass(PairOfStringInt.class);
    job.setOutputValueClass(IntWritable.class);

    job.setMapperClass(MyMapper.class);
    job.setCombinerClass(MyReducer.class);
    job.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();
    job.waitForCompletion(true);
    LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

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

License:Apache License

/**
 * Runs this tool.//from w  w w.ja  v  a 2s . c o m
 */
@SuppressWarnings({ "static-access" })
public int run(String[] args) throws Exception {
    Options options = new Options();

    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("input path").create(INPUT));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("output path").create(OUTPUT));
    options.addOption(OptionBuilder.withArgName("num").hasArg().withDescription("number of reducers")
            .create(NUM_REDUCERS));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();

    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    if (!cmdline.hasOption(INPUT) || !cmdline.hasOption(OUTPUT)) {
        System.out.println("args: " + Arrays.toString(args));
        HelpFormatter formatter = new HelpFormatter();
        formatter.setWidth(120);
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String inputPath = cmdline.getOptionValue(INPUT);
    String outputPath = cmdline.getOptionValue(OUTPUT);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;

    LOG.info("Tool: " + WordCountM.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - number of reducers: " + reduceTasks);

    Configuration conf = getConf();
    Job job = Job.getInstance(conf);
    job.setJobName(WordCountM.class.getSimpleName());
    job.setJarByClass(WordCountM.class);

    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, new Path(inputPath));
    FileOutputFormat.setOutputPath(job, new Path(outputPath));

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

    job.setMapperClass(MyMapper.class);
    job.setCombinerClass(MyReducer.class);
    job.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();
    job.waitForCompletion(true);
    LOG.info("Job Finished in " + (System.currentTimeMillis() - startTime) / 1000.0 + " seconds");

    return 0;
}

---

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