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.ucsb.cs.sort.signature.SigSortMain.java

License:Apache License

/**
 * Sets the job configurations including the mapper and reducer classes to
 * do the sorting based signatures./*w w w  .j a va 2 s  . c om*/
 */
public static void main(String[] args) throws IOException {

    JobConf job = new JobConf();
    new GenericOptionsParser(job, args);
    job.setJobName(SigSortMain.class.getSimpleName());
    job.setJarByClass(SigSortMain.class);
    job.setMapperClass(SigSortMapper.class);
    job.setMapOutputKeyClass(BitSignature.class);
    job.setMapOutputValueClass(LongWritable.class);

    job.setPartitionerClass(SigRangePartitioner.class);

    job.setReducerClass(SigSortReducer.class);
    job.setNumReduceTasks(job.getInt(SortDriver.NUM_REDUCE_PROPERTY, SortDriver.NUM_REDUCE_VALUE));
    job.setOutputKeyClass(LongWritable.class);
    job.setOutputValueClass(BitSignature.class);
    //
    // set input & output
    //
    String inputDir = SortDriver.INPUT_DIR;
    if (inputDir == null) {
        throw new UnsupportedOperationException("ERROR: input path not set");
    }
    job.setInputFormat(SequenceFileInputFormat.class);
    SequenceFileInputFormat.addInputPath(job, new Path(inputDir));
    Path outputPath = new Path(OUTPUT_PATH);
    FileSystem.get(job).delete(outputPath, true);
    job.setOutputFormat(SequenceFileOutputFormat.class);
    FileOutputFormat.setOutputPath(job, outputPath);

    //
    // run
    //
    JobSubmitter.run(job, "Sort By Signature Bytes", -1);
}

---

From source file:edu.umd.cloud9.collection.aquaint2.DemoCountAquaint2Documents.java

License:Apache License

/**
 * Runs this tool./*w  w  w  .  ja  v  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];
    String mappingFile = args[2];
    int mapTasks = Integer.parseInt(args[3]);

    System.out.println("input dir: " + inputPath);
    System.out.println("output dir: " + outputPath);
    System.out.println("mapping file: " + mappingFile);
    System.out.println("number of mappers: " + mapTasks);

    JobConf conf = new JobConf(DemoCountAquaint2Documents.class);
    conf.setJobName("DemoCountAquaint2Documents");

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

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

    conf.setInputFormat(Aquaint2DocumentInputFormatOld.class);
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(IntWritable.class);

    conf.setMapperClass(MyMapper.class);

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

    JobClient.runJob(conf);

    // clean up
    FileSystem.get(conf).delete(new Path(outputPath), true);

    return 0;
}

---

From source file:edu.umd.cloud9.collection.aquaint2.NumberAquaint2Documents.java

License:Apache License

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

    String inputPath = args[0];
    String outputPath = args[1];
    String outputFile = args[2];
    int mapTasks = 10;

    LOG.info("Tool: " + NumberAquaint2Documents.class.getCanonicalName());
    LOG.info(" - Input path: " + inputPath);
    LOG.info(" - Output path: " + outputPath);
    LOG.info(" - Output file: " + outputFile);

    JobConf conf = new JobConf(NumberAquaint2Documents.class);
    conf.setJobName(NumberAquaint2Documents.class.getSimpleName());

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(1);

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

    conf.setInputFormat(Aquaint2DocumentInputFormat.class);
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(IntWritable.class);
    conf.setOutputFormat(TextOutputFormat.class);

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

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

    JobClient.runJob(conf);

    Aquaint2DocnoMapping.writeDocnoData(new Path(outputPath + "/part-00000"), new Path(outputFile),
            FileSystem.get(conf));

    return 0;
}

---

From source file:edu.umd.cloud9.collection.clue.ClueWarcForwardIndexBuilder.java

License:Apache License

/**
 * Runs this tool.//  w w w.j  a va2 s  .co m
 */
@SuppressWarnings("static-access")
public int run(String[] args) throws Exception {
    Options options = new Options();
    options.addOption(OptionBuilder.withArgName("path").hasArg()
            .withDescription("(required) collection path (must be block-compressed SequenceFiles)")
            .create(COLLECTION_OPTION));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("(required) output index path")
            .create(INDEX_OPTION));

    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(COLLECTION_OPTION) || !cmdline.hasOption(INDEX_OPTION)) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    JobConf conf = new JobConf(getConf(), ClueWarcForwardIndexBuilder.class);
    FileSystem fs = FileSystem.get(conf);

    String collectionPath = cmdline.getOptionValue(COLLECTION_OPTION);
    String indexFile = cmdline.getOptionValue(INDEX_OPTION);

    LOG.info("Tool name: " + ClueWarcForwardIndexBuilder.class.getSimpleName());
    LOG.info(" - collection path: " + collectionPath);
    LOG.info(" - index file: " + indexFile);
    LOG.info("Note: This tool only works on block-compressed SequenceFiles!");

    Random random = new Random();
    Path outputPath = new Path(
            "tmp-" + ClueWarcForwardIndexBuilder.class.getSimpleName() + "-" + random.nextInt(10000));

    conf.setJobName(ClueWarcForwardIndexBuilder.class.getSimpleName() + ":" + collectionPath);

    conf.setNumMapTasks(100);
    conf.setNumReduceTasks(1);

    // Note, we have to add the files one by one, otherwise, SequenceFileInputFormat
    // thinks its a MapFile.
    for (FileStatus status : fs.listStatus(new Path(collectionPath))) {
        FileInputFormat.addInputPath(conf, status.getPath());
    }
    FileOutputFormat.setOutputPath(conf, outputPath);
    FileOutputFormat.setCompressOutput(conf, false);

    conf.setInputFormat(NoSplitSequenceFileInputFormat.class);
    conf.setOutputKeyClass(IntWritable.class);
    conf.setOutputValueClass(Text.class);

    conf.setMapRunnerClass(MyMapRunner.class);
    conf.setReducerClass(IdentityReducer.class);

    // delete the output directory if it exists already
    fs.delete(outputPath, true);

    RunningJob job = JobClient.runJob(conf);

    Counters counters = job.getCounters();
    int blocks = (int) counters.findCounter(Blocks.Total).getCounter();

    LOG.info("number of blocks: " + blocks);

    LOG.info("Writing index file...");
    LineReader reader = new LineReader(fs.open(new Path(outputPath + "/part-00000")));
    FSDataOutputStream out = fs.create(new Path(indexFile), true);

    out.writeUTF(ClueWarcForwardIndex.class.getCanonicalName());
    out.writeUTF(collectionPath);
    out.writeInt(blocks);

    int cnt = 0;
    Text line = new Text();
    while (reader.readLine(line) > 0) {
        String[] arr = line.toString().split("\\s+");

        int docno = Integer.parseInt(arr[0]);
        int offset = Integer.parseInt(arr[1]);
        short fileno = Short.parseShort(arr[2]);

        out.writeInt(docno);
        out.writeInt(offset);
        out.writeShort(fileno);

        cnt++;

        if (cnt % 100000 == 0) {
            LOG.info(cnt + " blocks written");
        }
    }

    reader.close();
    out.close();

    if (cnt != blocks) {
        throw new RuntimeException("Error: mismatch in block count!");
    }

    fs.delete(outputPath, true);
    return 0;
}

---

From source file:edu.umd.cloud9.collection.clue.CountClueWarcRecords.java

License:Apache License

/**
 * Runs this tool.//from   www . j a  va 2 s .c  o  m
 */
@SuppressWarnings("static-access")
public int run(String[] args) throws Exception {
    Options options = new Options();
    options.addOption(new Option(ORIGINAL_OPTION, "use original ClueWeb09 distribution"));
    options.addOption(new Option(REPACKED_OPTION, "use repacked SequenceFiles"));

    options.addOption(OptionBuilder.withArgName("path").hasArg()
            .withDescription("path: base path for 'original', actual path for 'repacked'").create(PATH_OPTION));
    options.addOption(OptionBuilder.withArgName("path").hasArg().withDescription("DocnoMapping data path")
            .create(MAPPING_OPTION));
    options.addOption(OptionBuilder.withArgName("num").hasArg()
            .withDescription("segment number (required if 'original')").create(SEGMENT_OPTION));
    options.addOption(OptionBuilder.withArgName("path").hasArg()
            .withDescription("output file to write the number of records").create(COUNT_OPTION));

    CommandLine cmdline;
    CommandLineParser parser = new GnuParser();
    try {
        cmdline = parser.parse(options, args);
    } catch (ParseException exp) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        System.err.println("Error parsing command line: " + exp.getMessage());
        return -1;
    }

    boolean repacked;
    if (cmdline.hasOption(REPACKED_OPTION)) {
        repacked = true;
    } else if (cmdline.hasOption(ORIGINAL_OPTION)) {
        repacked = false;
    } else {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        System.err.println("Expecting either -original or -repacked");
        return -1;
    }

    if (!cmdline.hasOption(PATH_OPTION) || !cmdline.hasOption(MAPPING_OPTION)
            || (!repacked && !cmdline.hasOption(SEGMENT_OPTION))) {
        HelpFormatter formatter = new HelpFormatter();
        formatter.printHelp(this.getClass().getName(), options);
        ToolRunner.printGenericCommandUsage(System.out);
        return -1;
    }

    String path = cmdline.getOptionValue(PATH_OPTION);
    String mappingFile = cmdline.getOptionValue(MAPPING_OPTION);

    int segment = 1;
    if (!repacked) {
        segment = Integer.parseInt(cmdline.getOptionValue(SEGMENT_OPTION));
    }

    LOG.info("Tool name: " + CountClueWarcRecords.class.getSimpleName());
    LOG.info(" - repacked: " + repacked);
    LOG.info(" - path: " + path);
    LOG.info(" - mapping file: " + mappingFile);
    if (!repacked) {
        LOG.info(" - segment number: " + segment);
    }

    FileSystem fs = FileSystem.get(getConf());
    int mapTasks = 10;

    JobConf conf = new JobConf(getConf(), CountClueWarcRecords.class);
    conf.setJobName(
            CountClueWarcRecords.class.getSimpleName() + (repacked ? ":" + path : ":segment" + segment));

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

    if (repacked) {
        // Note, we have to add the files one by one, otherwise, SequenceFileInputFormat
        // thinks its a MapFile.
        for (FileStatus status : fs.listStatus(new Path(path))) {
            FileInputFormat.addInputPath(conf, status.getPath());
        }
    } else {
        ClueCollectionPathConstants.addEnglishCollectionPart(conf, path, segment);
    }

    DistributedCache.addCacheFile(new URI(mappingFile), conf);

    if (repacked) {
        conf.setInputFormat(SequenceFileInputFormat.class);
    } else {
        conf.setInputFormat(ClueWarcInputFormat.class);
    }

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

    RunningJob job = JobClient.runJob(conf);
    Counters counters = job.getCounters();
    int numDocs = (int) counters.findCounter(Records.PAGES).getCounter();

    LOG.info("Read " + numDocs + " docs.");

    if (cmdline.hasOption(COUNT_OPTION)) {
        String f = cmdline.getOptionValue(COUNT_OPTION);
        FSDataOutputStream out = fs.create(new Path(f));
        out.write(new Integer(numDocs).toString().getBytes());
        out.close();
    }

    return 0;
}

---

From source file:edu.umd.cloud9.collection.clue.RepackClueWarcRecords.java

License:Apache License

/**
 * Runs this tool./* ww w.ja v a 2s  .co  m*/
 */
public int run(String[] args) throws Exception {
    if (args.length != 5) {
        printUsage();
        return -1;
    }

    String basePath = args[0];
    String outputPath = args[1];
    int segment = Integer.parseInt(args[2]);
    String data = args[3];
    String compressionType = args[4];

    if (!compressionType.equals("block") && !compressionType.equals("record")
            && !compressionType.equals("none")) {
        System.err.println("Error: \"" + compressionType + "\" unknown compression type!");
        System.exit(-1);
    }

    // Default block size.
    int blocksize = 1000000;

    JobConf conf = new JobConf(RepackClueWarcRecords.class);
    conf.setJobName("RepackClueWarcRecords:segment" + segment);

    conf.set("DocnoMappingDataFile", data);

    LOG.info("Tool name: RepackClueWarcRecords");
    LOG.info(" - base path: " + basePath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - segment number: " + segment);
    LOG.info(" - docno mapping data file: " + data);
    LOG.info(" - compression type: " + compressionType);

    if (compressionType.equals("block")) {
        LOG.info(" - block size: " + blocksize);
    }

    int mapTasks = 10;

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

    ClueCollectionPathConstants.addEnglishCollectionPart(conf, basePath, segment);

    SequenceFileOutputFormat.setOutputPath(conf, new Path(outputPath));

    if (compressionType.equals("none")) {
        SequenceFileOutputFormat.setCompressOutput(conf, false);
    } else {
        SequenceFileOutputFormat.setCompressOutput(conf, true);

        if (compressionType.equals("record")) {
            SequenceFileOutputFormat.setOutputCompressionType(conf, SequenceFile.CompressionType.RECORD);
        } else {
            SequenceFileOutputFormat.setOutputCompressionType(conf, SequenceFile.CompressionType.BLOCK);
            conf.setInt("io.seqfile.compress.blocksize", blocksize);
        }
    }

    conf.setInputFormat(ClueWarcInputFormat.class);
    conf.setOutputFormat(SequenceFileOutputFormat.class);
    conf.setOutputKeyClass(IntWritable.class);
    conf.setOutputValueClass(ClueWarcRecord.class);

    conf.setMapperClass(MyMapper.class);

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

    JobClient.runJob(conf);

    return 0;
}

---

From source file:edu.umd.cloud9.collection.line.DemoCountTextDocuments.java

License:Apache License

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

    String inputPath = args[0];

    sLogger.info("input: " + inputPath);

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

    conf.setNumReduceTasks(0);

    FileInputFormat.setInputPaths(conf, new Path(inputPath));

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

    JobClient.runJob(conf);

    return 0;
}

---

From source file:edu.umd.cloud9.collection.line.NumberTextDocuments.java

License:Apache License

/**
 * Runs this tool./*from  w  w w .j  av 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];
    String outputFile = args[2];
    int mapTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool: NumberTextDocuments");
    sLogger.info(" - Input path: " + inputPath);
    sLogger.info(" - Output path: " + outputPath);
    sLogger.info(" - Output file: " + outputFile);
    sLogger.info("Launching with " + mapTasks + " mappers...");

    JobConf conf = new JobConf(getConf(), NumberTextDocuments.class);
    conf.setJobName("NumberTextDocuments");

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(1);

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

    conf.setInputFormat(TextDocumentInputFormat.class);
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(IntWritable.class);
    conf.setOutputFormat(TextOutputFormat.class);

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

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

    JobClient.runJob(conf);

    String input = outputPath + (outputPath.endsWith("/") ? "" : "/") + "/part-00000";
    TextDocnoMapping.writeDocnoData(input, outputFile, FileSystem.get(getConf()));

    return 0;
}

---

From source file:edu.umd.cloud9.collection.medline.DemoCountMedlineCitations.java

License:Apache License

/**
 * Runs this tool.//from  ww w.j  ava2  s.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];
    String mappingFile = args[2];

    sLogger.info("input: " + inputPath);
    sLogger.info("output dir: " + outputPath);
    sLogger.info("docno mapping file: " + mappingFile);

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

    conf.setNumReduceTasks(0);

    // pass in the class name as a String; this is makes the mapper general
    // in being able to load any collection of Indexable objects that has
    // docid/docno mapping specified by a DocnoMapping object
    conf.set("DocnoMappingClass", "edu.umd.cloud9.collection.medline.MedlineDocnoMapping");

    // put the mapping file in the distributed cache so each map worker will
    // have it
    DistributedCache.addCacheFile(new URI(mappingFile), conf);

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

    conf.setInputFormat(MedlineCitationInputFormat.class);
    conf.setOutputKeyClass(Text.class);
    conf.setOutputValueClass(IntWritable.class);

    conf.setMapperClass(MyMapper.class);

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

    JobClient.runJob(conf);

    return 0;
}

---

From source file:edu.umd.cloud9.collection.medline.NumberMedlineCitations.java

License:Apache License

/**
 * Runs this tool.//from ww w .j ava  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];
    String outputFile = args[2];
    int mapTasks = Integer.parseInt(args[3]);

    sLogger.info("Tool name: NumberMedlineCitations");
    sLogger.info(" - Input path: " + inputPath);
    sLogger.info(" - Output path: " + outputPath);
    sLogger.info(" - Output file: " + outputFile);
    sLogger.info("Launching with " + mapTasks + " mappers...");

    JobConf conf = new JobConf(getConf(), NumberMedlineCitations.class);
    conf.setJobName("NumberMedlineCitations");

    conf.setNumMapTasks(mapTasks);
    conf.setNumReduceTasks(1);

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

    conf.setInputFormat(MedlineCitationInputFormat.class);
    conf.setOutputKeyClass(IntWritable.class);
    conf.setOutputValueClass(IntWritable.class);
    conf.setOutputFormat(TextOutputFormat.class);

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

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

    RunningJob job = JobClient.runJob(conf);

    // write out various properties
    Counters counters = job.getCounters();
    Counter counter = counters.findCounter("edu.umd.cloud9.collection.medline.NumberMedlineCitations$Citations",
            0, "");

    int numdocs = (int) counter.getCounter();
    sLogger.info("total number of docs: " + numdocs);

    MedlineDocnoMapping.writeDocidData(outputPath + "/part-00000", outputFile);

    return 0;
}

---

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