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

Introduction

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

Prototype

public void setReducerClass(Class<? extends Reducer> theClass) 

Source Link

Document

Set the Reducer class for the job.

Usage

From source file:net.team1.dev.HousingAnalysis.java

License:Apache License

/**
 * The main entry point for the map/reduce runner.
 *
 * @param args 2 args: \<input dir\> \<output dir\>
 * @throws Exception Throws IOException//www. j a va 2  s.c o  m
 */
public static void main(String[] args) throws Exception {
    Path inputDir = new Path(args[0]);
    Path outputDir = new Path(args[1]);
    FileSystem fs = FileSystem.get(new Configuration());

    if (!fs.exists(inputDir))
        throw new IOException("The input path does not exist.");
    if (fs.isFile(inputDir))
        throw new IOException("The input path is a file.");
    if (fs.exists(outputDir))
        fs.delete(outputDir, true);

    // set job configuration
    JobConf conf = new JobConf(HousingAnalysis.class);
    conf.setJobName("housinganalysis");
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(Text.class);
    conf.setOutputFormat(TextOutputFormat.class);
    conf.setCombinerClass(HousingReducer.class);
    conf.setReducerClass(HousingReducer.class);

    // set multiple input files
    HashMap<Path, Class<? extends Mapper>> inputMappers = getInputFilePaths(inputDir, fs);
    for (Path p : inputMappers.keySet()) {
        MultipleInputs.addInputPath(conf, p, TextInputFormat.class, inputMappers.get(p));
        LOG.info(p.getName() + ": " + inputMappers.get(p).getName());
    }

    // set output
    FileOutputFormat.setOutputPath(conf, outputDir);

    // start the job
    JobClient.runJob(conf);
}

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From source file:nl.tudelft.graphalytics.mapreducev2.MapReduceJob.java

License:Apache License

@Override
public int run(String[] args) throws Exception {
    FileSystem dfs = FileSystem.get(getConf());
    String inPath = inputPath;/* w w w .  j a  v  a 2s. c  o  m*/

    while (!isFinished()) {
        iteration++;

        // Prepare job configuration
        JobConf jobConfiguration = new JobConf(this.getConf());
        jobConfiguration.setJarByClass(this.getClass());

        jobConfiguration.setMapOutputKeyClass(getMapOutputKeyClass());
        jobConfiguration.setMapOutputValueClass(getMapOutputValueClass());

        jobConfiguration.setMapperClass(getMapperClass());
        if (getCombinerClass() != null)
            jobConfiguration.setCombinerClass(getCombinerClass());
        jobConfiguration.setReducerClass(getReducerClass());

        jobConfiguration.setOutputKeyClass(getOutputKeyClass());
        jobConfiguration.setOutputValueClass(getOutputValueClass());

        jobConfiguration.setInputFormat(getInputFormatClass());
        jobConfiguration.setOutputFormat(getOutputFormatClass());

        if (getNumMappers() != -1)
            jobConfiguration.setNumMapTasks(getNumMappers());
        if (getNumReducers() != -1)
            jobConfiguration.setNumReduceTasks(getNumReducers());

        setConfigurationParameters(jobConfiguration);

        // Set the input and output paths
        String outPath = intermediatePath + "/iteration-" + iteration;
        FileInputFormat.addInputPath(jobConfiguration, new Path(inPath));
        FileOutputFormat.setOutputPath(jobConfiguration, new Path(outPath));

        // Execute the current iteration
        RunningJob jobExecution = JobClient.runJob(jobConfiguration);
        jobExecution.waitForCompletion();

        // Remove the output of the previous job (unless it is the input graph)
        if (iteration != 1) {
            dfs.delete(new Path(inPath), true);
        }
        inPath = outPath;

        processJobOutput(jobExecution);
    }

    // Rename the last job output to the specified output path
    try {
        dfs.mkdirs(new Path(outputPath).getParent());
        dfs.rename(new Path(inPath), new Path(outputPath));
    } catch (Exception e) {
        LOG.warn("Failed to rename MapReduce job output.", e);
    }

    return 0;
}

---

From source file:nlp.com.knowledgebooks.mapreduce.NameFinder.java

License:Open Source License

/**
 * The main driver for name finder map/reduce program.
 * <p/>/*from  w  ww  .  ja v  a2 s.c o m*/
 * NOTE: copied with modifications from Hadoppjava example programs
 * <p/>
 * Invoke this method to submit the map/reduce job.
 *
 * @throws IOException When there is communication problems with the
 *                     job tracker.
 */
public int run(String[] args) throws Exception {
    JobConf conf = new JobConf(getConf(), NameFinder.class);
    conf.setJobName("namefinder");
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(Text.class);
    conf.setMapperClass(MapClass.class);
    //conf.setCombinerClass(Reduce.class);
    conf.setReducerClass(Reduce.class);
    List<String> other_args = new ArrayList<String>();
    for (int i = 0; i < args.length; ++i) {
        try {
            if ("-m".equals(args[i])) {
                conf.setNumMapTasks(Integer.parseInt(args[++i]));
            } else if ("-r".equals(args[i])) {
                conf.setNumReduceTasks(Integer.parseInt(args[++i]));
            } else {
                other_args.add(args[i]);
            }
        } catch (Exception ex) {
            System.err.println("ERROR: " + ex);
        }
    }
    FileInputFormat.setInputPaths(conf, other_args.get(0));
    FileOutputFormat.setOutputPath(conf, new Path(other_args.get(1)));
    JobClient.runJob(conf);
    return 0;
}

---

From source file:nthu.scopelab.tsqr.ssvd.BtJob.java

License:Apache License

public static void run(Configuration conf, Path[] inputPath, Path btPath, String qrfPath, int k, int p,
        int outerBlockHeight, int reduceTasks, boolean outputBBtProducts, String reduceSchedule, int mis)
        throws Exception {
    boolean outputQ = true;

    String stages[] = reduceSchedule.split(",");

    JobConf job = new JobConf(conf, BtJob.class);
    job.setInputFormat(SequenceFileInputFormat.class);
    job.setOutputFormat(SequenceFileOutputFormat.class);
    job.setInt(SCHEDULE_NUM, stages.length);
    job.setInt(PROP_OUTER_PROD_BLOCK_HEIGHT, outerBlockHeight);
    job.setInt(QJob.PROP_K, k);/*  w w w  . j a v  a2s  . c o m*/
    job.setInt(QJob.PROP_P, p);
    job.setBoolean(QmultiplyJob.OUTPUT_Q, outputQ);
    job.setBoolean(PROP_OUPTUT_BBT_PRODUCTS, outputBBtProducts);
    job.set(QmultiplyJob.QRF_DIR, qrfPath);
    FileSystem.get(job).delete(btPath, true);

    FileOutputFormat.setOutputPath(job, btPath);

    FileOutputFormat.setCompressOutput(job, true);
    FileOutputFormat.setOutputCompressorClass(job, DefaultCodec.class);
    SequenceFileOutputFormat.setOutputCompressionType(job, CompressionType.BLOCK);

    job.setJobName("BtJob");

    job.setMapOutputKeyClass(IntWritable.class);
    job.setMapOutputValueClass(SparseRowBlockWritable.class);
    job.setOutputKeyClass(IntWritable.class);
    //job.setOutputValueClass(SparseRowBlockWritable.class);
    job.setOutputValueClass(VectorWritable.class);

    job.setMapperClass(BtMapper.class);
    job.setCombinerClass(OuterProductCombiner.class);
    job.setReducerClass(OuterProductReducer.class);

    fileGather fgather = new fileGather(inputPath, "", FileSystem.get(job));
    mis = Checker.checkMis(mis, fgather.getInputSize(), FileSystem.get(job));
    job.setNumMapTasks(fgather.recNumMapTasks(mis));

    //job.setNumReduceTasks(0);
    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, inputPath);

    if (outputQ) {
        MultipleOutputs.addNamedOutput(job, QmultiplyJob.Q_MAT, SequenceFileOutputFormat.class,
                IntWritable.class, LMatrixWritable.class);
    }
    if (outputBBtProducts) {
        MultipleOutputs.addNamedOutput(job, OUTPUT_BBT, SequenceFileOutputFormat.class, IntWritable.class,
                VectorWritable.class);
    }
    RunningJob rj = JobClient.runJob(job);
    System.out.println("Btjob Job ID: " + rj.getJobID().toString());
}

---

From source file:nthu.scopelab.tsqr.ssvd.itBtJob.java

License:Apache License

public static void run(Configuration conf, Path[] inputPath, Path btPath, String qrfPath, int k, int p,
        int outerBlockHeight, int reduceTasks, boolean outputBBtProducts, String reduceSchedule, int mis)
        throws Exception {
    boolean outputQ = true;

    String stages[] = reduceSchedule.split(",");

    JobConf job = new JobConf(conf, itBtJob.class);
    job.setInputFormat(SequenceFileInputFormat.class);
    job.setOutputFormat(SequenceFileOutputFormat.class);
    job.setInt(SCHEDULE_NUM, stages.length);
    job.setInt(PROP_OUTER_PROD_BLOCK_HEIGHT, outerBlockHeight);
    job.setInt(QJob.PROP_K, k);/*from   ww w .j  av  a 2 s  .  co  m*/
    job.setInt(QJob.PROP_P, p);
    job.setBoolean(QmultiplyJob.OUTPUT_Q, outputQ);
    job.setBoolean(PROP_OUPTUT_BBT_PRODUCTS, outputBBtProducts);
    job.set(QmultiplyJob.QRF_DIR, qrfPath);
    FileSystem.get(job).delete(btPath, true);

    FileOutputFormat.setOutputPath(job, btPath);

    FileOutputFormat.setCompressOutput(job, true);
    FileOutputFormat.setOutputCompressorClass(job, DefaultCodec.class);
    SequenceFileOutputFormat.setOutputCompressionType(job, CompressionType.BLOCK);

    job.setJobName("itBtJob");

    job.setMapOutputKeyClass(IntWritable.class);
    job.setMapOutputValueClass(SparseRowBlockWritable.class);
    job.setOutputKeyClass(IntWritable.class);
    //job.setOutputValueClass(SparseRowBlockWritable.class);
    job.setOutputValueClass(VectorWritable.class);

    job.setMapperClass(BtMapper.class);
    job.setCombinerClass(OuterProductCombiner.class);
    job.setReducerClass(OuterProductReducer.class);

    fileGather fgather = new fileGather(inputPath, "", FileSystem.get(job));
    mis = Checker.checkMis(mis, fgather.getInputSize(), FileSystem.get(job));
    job.setNumMapTasks(fgather.recNumMapTasks(mis));

    //job.setNumReduceTasks(0);
    job.setNumReduceTasks(reduceTasks);

    FileInputFormat.setInputPaths(job, inputPath);

    if (outputQ) {
        MultipleOutputs.addNamedOutput(job, QmultiplyJob.Q_MAT, SequenceFileOutputFormat.class,
                IntWritable.class, LMatrixWritable.class);
    }
    if (outputBBtProducts) {
        MultipleOutputs.addNamedOutput(job, OUTPUT_BBT, SequenceFileOutputFormat.class, IntWritable.class,
                VectorWritable.class);
    }
    RunningJob rj = JobClient.runJob(job);
    System.out.println("itBtJob Job ID: " + rj.getJobID().toString());
}

---

From source file:nthu.scopelab.tsqr.ssvd.itQJob.java

License:Apache License

public static void run(Configuration conf, Path[] inputPaths, String outputPath, String reduceSchedule, int k,
        int p, long seed, int mis) throws ClassNotFoundException, InterruptedException, IOException {

    String stages[] = reduceSchedule.split(",");
    String rinput = "";
    String routput = outputPath + "/iter-r-";

    for (int i = 0; i < stages.length; i++) {
        String thenumber = Integer.toString(i + 1);
        JobConf job = new JobConf(conf, itQJob.class);
        job.setJobName("itQ-job-" + thenumber);
        job.setInputFormat(SequenceFileInputFormat.class);
        job.setOutputFormat(SequenceFileOutputFormat.class);

        if (i == 0)
            job.setMapperClass(QMapper.class);
        else/*from ww w.j a v  a 2 s.  c  om*/
            job.setMapperClass(IdentityMapper.class);

        job.setReducerClass(QReducer.class);
        job.setOutputKeyClass(IntWritable.class);
        job.setOutputValueClass(LMatrixWritable.class);

        FileSystem fs = FileSystem.get(job);
        Path Paths[];
        fileGather fgather = null;
        if (i == 0)
            fgather = new fileGather(inputPaths, "part", fs);
        else
            fgather = new fileGather(new Path(rinput), "part", fs);
        Paths = fgather.getPaths();
        mis = Checker.checkMis(mis, fgather.getInputSize(), fs);
        job.setNumMapTasks(fgather.recNumMapTasks(mis));

        job.setNumReduceTasks(Integer.parseInt(stages[i]));

        job.setInt(QRFirstJob.COLUMN_SIZE, k + p);
        job.setLong(PROP_OMEGA_SEED, seed);
        job.setInt(PROP_K, k);
        job.setInt(PROP_P, p);

        fs.delete(new Path(routput + thenumber), true);

        FileInputFormat.setInputPaths(job, Paths);

        FileOutputFormat.setOutputPath(job, new Path(routput + thenumber));

        //FileOutputFormat.setCompressOutput(job, true);
        //FileOutputFormat.setOutputCompressorClass(job, DefaultCodec.class);
        //SequenceFileOutputFormat.setOutputCompressionType(job,CompressionType.BLOCK);
        //output first level Q
        MultipleOutputs.addNamedOutput(job, QF_MAT, SequenceFileOutputFormat.class, IntWritable.class,
                LMatrixWritable.class);

        RunningJob rj = JobClient.runJob(job);
        System.out.println("itQJob Job ID: " + rj.getJobID().toString());
        rinput = routput + thenumber;
    }
}

---

From source file:nthu.scopelab.tsqr.ssvd.QJob.java

License:Apache License

public static void run(Configuration conf, Path[] inputPaths, String outputPath, String reduceSchedule, int k,
        int p, long seed, int mis) throws ClassNotFoundException, InterruptedException, IOException {

    String stages[] = reduceSchedule.split(",");
    String rinput = "";
    String routput = outputPath + "/iter-r-";

    for (int i = 0; i < stages.length; i++) {
        String thenumber = Integer.toString(i + 1);
        JobConf job = new JobConf(conf, QJob.class);
        job.setJobName("Q-job-" + thenumber);
        job.setInputFormat(SequenceFileInputFormat.class);
        job.setOutputFormat(SequenceFileOutputFormat.class);

        if (i == 0)
            job.setMapperClass(QMapper.class);
        else/*from  ww  w . ja  va  2 s.  co  m*/
            job.setMapperClass(IdentityMapper.class);

        job.setReducerClass(QReducer.class);
        job.setOutputKeyClass(IntWritable.class);
        job.setOutputValueClass(LMatrixWritable.class);

        FileSystem fs = FileSystem.get(job);
        Path Paths[];
        fileGather fgather = null;
        if (i == 0)
            fgather = new fileGather(inputPaths, "part", fs);
        else
            fgather = new fileGather(new Path(rinput), "part", fs);
        Paths = fgather.getPaths();
        mis = Checker.checkMis(mis, fgather.getInputSize(), fs);
        job.setNumMapTasks(fgather.recNumMapTasks(mis));

        job.setNumReduceTasks(Integer.parseInt(stages[i]));

        job.setInt(QRFirstJob.COLUMN_SIZE, k + p);
        job.setLong(PROP_OMEGA_SEED, seed);
        job.setInt(PROP_K, k);
        job.setInt(PROP_P, p);

        fs.delete(new Path(routput + thenumber), true);

        FileInputFormat.setInputPaths(job, Paths);

        FileOutputFormat.setOutputPath(job, new Path(routput + thenumber));

        //FileOutputFormat.setCompressOutput(job, true);
        //FileOutputFormat.setOutputCompressorClass(job, DefaultCodec.class);
        //SequenceFileOutputFormat.setOutputCompressionType(job,CompressionType.BLOCK);
        //output first level Q
        MultipleOutputs.addNamedOutput(job, QF_MAT, SequenceFileOutputFormat.class, IntWritable.class,
                LMatrixWritable.class);

        RunningJob rj = JobClient.runJob(job);
        System.out.println("QJob Job ID: " + rj.getJobID().toString());
        rinput = routput + thenumber;
    }
}

---

From source file:org.acacia.csr.java.CSRConverter.java

License:Apache License

public static void main(String[] args) throws Exception {
    if (!validArgs(args)) {
        printUsage();//from  w w w . java2  s .  c o m
        return;
    }
    //These are the temp paths that are created on HDFS
    String dir1 = "/user/miyuru/csrconverter-output";
    String dir2 = "/user/miyuru/csrconverter-output-sorted";

    //We first delete the temporary directories if they exist on the HDFS
    FileSystem fs1 = FileSystem.get(new JobConf());

    System.out.println("Deleting the dir : " + dir1);

    if (fs1.exists(new Path(dir1))) {
        fs1.delete(new Path(dir1), true);
    }

    System.out.println("Done deleting the dir : " + dir1);
    System.out.println("Deleting the dir : " + dir2);
    if (fs1.exists(new Path(dir2))) {
        fs1.delete(new Path(dir2), true);
    }

    Path notinPath = new Path("/user/miyuru/notinverts/notinverts");

    if (!fs1.exists(notinPath)) {
        fs1.create(notinPath);
    }

    System.out.println("Done deleting the dir : " + dir2);

    //Note on Aug 23 2014: Sometimes after this the mapReduce job hangs. need to see why.

    VertexCounterClient.setDefaultGraphID(args[3], args[2]);

    //First job creates the inverted index

    JobConf conf = new JobConf(CSRConverter.class);
    conf.set("org.acacia.partitioner.hbase.zookeeper.quorum", args[1]);
    conf.set("org.acacia.partitioner.hbase.table", args[2]);
    conf.set("org.acacia.partitioner.hbase.contacthost", args[3]);
    conf.setOutputKeyClass(LongWritable.class);
    conf.setOutputValueClass(Text.class);
    //conf.setMapperClass(InvertedMapper.class);
    conf.setReducerClass(InvertedReducer.class);
    //conf.setInputFormat(TextInputFormat.class);
    conf.setInputFormat(NLinesInputFormat.class);
    conf.setOutputFormat(TextOutputFormat.class);

    //FileInputFormat.setInputPaths(conf, new Path(args[0]));
    MultipleInputs.addInputPath(conf, new Path(args[0]), NLinesInputFormat.class, InvertedMapper.class);
    MultipleInputs.addInputPath(conf, new Path("/user/miyuru/notinverts/notinverts"), TextInputFormat.class,
            InvertedMapper.class);
    FileOutputFormat.setOutputPath(conf, new Path(dir1));

    //Also for the moment we turn-off the speculative execution
    conf.setBoolean("mapred.map.tasks.speculative.execution", false);
    conf.setBoolean("mapred.reduce.tasks.speculative.execution", false);
    conf.setNumMapTasks(96);
    conf.setNumReduceTasks(96);
    conf.setPartitionerClass(VertexPartitioner.class);
    conf.set("vertex-count", args[4]);
    conf.set("zero-flag", args[5]);
    Job job = new Job(conf, "csr_inverter");
    job.setSortComparatorClass(SortComparator.class);
    job.waitForCompletion(true);
}

---

From source file:org.acacia.csr.java.LineCount.java

License:Apache License

public static void main(String[] args) throws Exception {
    /*/*www.  j ava2 s . c  om*/
      String dir1 = "/user/miyuru/wcout";
      String dir2 = "/user/miyuru/lcout";
       //We first delete the temporary directories if they exist on the HDFS
        FileSystem fs1 = FileSystem.get(new JobConf());
                
       if(fs1.exists(new Path(dir2))){
          fs1.delete(new Path(dir2), true);
       }
            
        JobConf conf = new JobConf(LineCount.class);
        conf.setJobName("LineCount");
               
        conf.setOutputKeyClass(IntWritable.class);
        conf.setOutputValueClass(IntWritable.class);
               
        conf.setMapperClass(Map.class);
        conf.setCombinerClass(Reduce.class);
        conf.setReducerClass(Reduce.class);
               
        conf.setInputFormat(TextInputFormat.class);
        conf.setOutputFormat(TextOutputFormat.class);
               
        FileInputFormat.setInputPaths(conf, new Path(dir1));
        FileOutputFormat.setOutputPath(conf, new Path(dir2));
               
        Job job = new Job(conf, "line count");
        job.waitForCompletion(true); 
        org.apache.hadoop.mapreduce.Counters cntr = job.getCounters();
        System .out.println("Number of lines in the file" + cntr.findCounter("org.apache.hadoop.mapred.Task$Counter", "MAP_INPUT_RECORDS").getValue());
        */

    long edgeCount = 0;
    //String dir3 = "/user/miyuru/wcout";
    String dir4 = "/user/miyuru/lcout";
    String dir5 = "/user/miyuru/input";
    //We first delete the temporary directories if they exist on the HDFS
    FileSystem fs2 = FileSystem.get(new JobConf());

    if (fs2.exists(new Path(dir4))) {
        fs2.delete(new Path(dir4), true);
    }

    JobConf conf1 = new JobConf(LineCount.class);
    conf1.setJobName("LineCount");

    conf1.setOutputKeyClass(Text.class);
    conf1.setOutputValueClass(IntWritable.class);

    conf1.setMapperClass(Map.class);
    conf1.setCombinerClass(Reduce.class);
    conf1.setReducerClass(Reduce.class);

    conf1.setInputFormat(TextInputFormat.class);
    conf1.setOutputFormat(TextOutputFormat.class);

    FileInputFormat.setInputPaths(conf1, new Path(dir5));
    FileOutputFormat.setOutputPath(conf1, new Path(dir4));

    Job job1 = new Job(conf1, "line count");
    job1.setNumReduceTasks(0);
    job1.waitForCompletion(true);
    org.apache.hadoop.mapreduce.Counters cntr = job1.getCounters();
    edgeCount = cntr.findCounter("org.apache.hadoop.mapred.Task$Counter", "MAP_INPUT_RECORDS").getValue();

    File efile = new File("/tmp/efile");

    if (efile.exists()) {
        efile.delete();
    }

    PrintWriter writer = new PrintWriter("/tmp/efile", "UTF-8");
    writer.println(edgeCount);
    writer.flush();
    writer.close();

    //edgeCount = edgeCount -1;//This is to remove the line number additionlly added to each edgelist file by HDFS. This is strange, but it happens.
    System.out.println("======>Edge count is : " + edgeCount);
    System.out.println("------Done Line Count---------------");
}

---

From source file:org.acacia.csr.java.NotInFinder.java

License:Apache License

public static void main(String[] args) throws Exception {
    String dir1 = "/user/miyuru/wcout";
    String dir2 = "/user/miyuru/notinverts";
    //We first delete the temporary directories if they exist on the HDFS
    FileSystem fs1 = FileSystem.get(new JobConf());

    if (fs1.exists(new Path(dir2))) {
        fs1.delete(new Path(dir2), true);
    }/*from w  w  w.java2s .co m*/

    JobConf conf = new JobConf();
    conf.setNumMapTasks(96);
    conf.setOutputKeyClass(LongWritable.class);
    conf.setOutputValueClass(LongWritable.class);
    conf.setMapperClass(TokenizerMapper.class);
    conf.setReducerClass(IntSumReducer.class);
    conf.setCombinerClass(IntSumReducer.class);
    conf.setInputFormat(NLinesInputFormat.class);
    conf.setOutputFormat(TextOutputFormat.class);
    FileInputFormat.setInputPaths(conf, new Path(dir1));
    FileOutputFormat.setOutputPath(conf, new Path(dir2));
    Job job = new Job(conf, "NotInFinder");
    job.setJarByClass(WordCount.class);
    //   job.setMapperClass(TokenizerMapper.class);
    //   job.setCombinerClass(IntSumReducer.class);
    //   job.setReducerClass(IntSumReducer.class);
    //   job.setOutputKeyClass(LongWritable.class);
    //   job.setOutputValueClass(LongWritable.class);

    job.setSortComparatorClass(SortComparator.class);
    job.waitForCompletion(true);

}

---

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