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

Introduction

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

Prototype

public void setMapperClass(Class<? extends Mapper> cls) throws IllegalStateException 

Source Link

Document

Set the Mapper for the job.

Usage

From source file:WordCount.java

License:Apache License

public int run(String[] args) throws Exception {
    ///start//from w  ww . ja va2s  .  c  o m
    final long startTime = System.currentTimeMillis();
    String outputReducerType = "filesystem";
    if (args != null && args[0].startsWith(OUTPUT_REDUCER_VAR)) {
        String[] s = args[0].split("=");
        if (s != null && s.length == 2)
            outputReducerType = s[1];
    }
    logger.info("output reducer type: " + outputReducerType);

    // use a smaller page size that doesn't divide the row count evenly to exercise the paging logic better
    ConfigHelper.setRangeBatchSize(getConf(), 99);

    for (int i = 0; i < WordCountSetup.TEST_COUNT; i++) {
        String columnName = "userId";
        Job job = new Job(getConf(), "wordcount");
        job.setJarByClass(WordCount.class);
        job.setMapperClass(TokenizerMapper.class);
        if (outputReducerType.equalsIgnoreCase("filesystem")) {
            job.setReducerClass(ReducerToFilesystem.class);
            job.setOutputKeyClass(Text.class);
            job.setOutputValueClass(Text.class);
            FileOutputFormat.setOutputPath(job, new Path(OUTPUT_PATH_PREFIX + i));
        } else {
            job.setReducerClass(ReducerToCassandra.class);

            job.setMapOutputKeyClass(Text.class);
            job.setMapOutputValueClass(Text.class);
            job.setOutputKeyClass(ByteBuffer.class);
            job.setOutputValueClass(List.class);

            job.setOutputFormatClass(ColumnFamilyOutputFormat.class);

            ConfigHelper.setOutputColumnFamily(job.getConfiguration(), KEYSPACE, OUTPUT_COLUMN_FAMILY);
            job.getConfiguration().set(CONF_COLUMN_NAME, "sum");
        }
        job.setInputFormatClass(ColumnFamilyInputFormat.class);
        ConfigHelper.setInputRpcPort(job.getConfiguration(), "9160");
        ConfigHelper.setInputInitialAddress(job.getConfiguration(), "localhost");

        //Change partitioner here
        ConfigHelper.setInputPartitioner(job.getConfiguration(), "RandomPartitioner");
        ConfigHelper.setInputColumnFamily(job.getConfiguration(), KEYSPACE, COLUMN_FAMILY);

        SlicePredicate predicate = new SlicePredicate()
                .setColumn_names(Arrays.asList(ByteBufferUtil.bytes(columnName)));
        ConfigHelper.setInputSlicePredicate(job.getConfiguration(), predicate);

        // this will cause the predicate to be ignored in favor of scanning everything as a wide row
        //Son degisiklik Super Column Support ?
        // ConfigHelper.setInputColumnFamily(job.getConfiguration(), KEYSPACE, COLUMN_FAMILY, true);

        ConfigHelper.setOutputInitialAddress(job.getConfiguration(), "localhost");
        ConfigHelper.setOutputPartitioner(job.getConfiguration(), "RandomPartitioner");
        job.waitForCompletion(true);
    }

    final double duration = (System.currentTimeMillis() - startTime) / 1000.0;
    System.out.println();
    System.out.println("Job Finished in " + duration + " seconds");
    System.out.println();

    return 0;
}

---

From source file:removeDup.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: removeDup <in> [<in>...] <out>");
        System.exit(2);//  w  w w . j av a 2  s  .c om
    }
    Job job = new Job(conf, "removeDup");
    job.setJarByClass(removeDup.class);
    job.setMapperClass(Map.class);
    //job.setCombinerClass(Reduce.class);
    job.setReducerClass(Reduce.class);
    job.setOutputKeyClass(Text.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:HiddenMarkovModelBuilder.java

License:Apache License

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

    job.setJarByClass(HiddenMarkovModelBuilder.class);

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

    Utility.setConfiguration(job.getConfiguration(), "avenir");
    job.setMapperClass(HiddenMarkovModelBuilder.StateTransitionMapper.class);
    job.setReducerClass(HiddenMarkovModelBuilder.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:FindMaxPageRankNodes.java

License:Apache License

/**
 * Runs this tool./* ww  w  .j  av 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("top n").create(TOP));

    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) || !cmdline.hasOption(TOP)) {
        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 n = Integer.parseInt(cmdline.getOptionValue(TOP));

    LOG.info("Tool name: " + FindMaxPageRankNodes.class.getSimpleName());
    LOG.info(" - input: " + inputPath);
    LOG.info(" - output: " + outputPath);
    LOG.info(" - top: " + n);

    Configuration conf = getConf();
    conf.setInt("mapred.min.split.size", 1024 * 1024 * 1024);
    conf.setInt("n", n);

    Job job = Job.getInstance(conf);
    job.setJobName(FindMaxPageRankNodes.class.getName() + ":" + inputPath);
    job.setJarByClass(FindMaxPageRankNodes.class);

    job.setNumReduceTasks(1);

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

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

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

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

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

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

    job.waitForCompletion(true);

    return 0;
}

---

From source file:GetUserInfoGivenMovieId.java

public static void main(String[] args) throws Exception {
    Configuration conf = new Configuration();
    conf.set("movieId", args[2]);
    Job job = new Job(conf, "GetUserInfoGivenMovieId");

    job.setInputFormatClass(TextInputFormat.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(Text.class);

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

    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[3]));

    boolean flag1 = job.waitForCompletion(true);

    if (flag1) {/*from   w w  w .  j ava2 s . co  m*/
        Configuration conf2 = new Configuration();
        //FileSystem fs = FileSystem.get(conf2);
        //Path Intermediate = new Path(args[1]);
        //DistributedCache.addCacheFile(Intermediate.toUri(), conf2);
        //DistributedCache.addCacheFile(new URI(args[1]),conf2);

        Job job2 = new Job(conf2, "UserInfo");
        /*Job job2 = new Job(new Configuration());
        Configuration conf2 = job.getConfiguration();
        job2.setJobName("Join with Cache");
        DistributedCache.addCacheFile(new URI(args[1]), conf2);*/
        job2.addCacheFile(new URI(args[1]));
        job2.setOutputKeyClass(Text.class);
        job2.setOutputValueClass(Text.class);
        job2.setJarByClass(GetUserInfoGivenMovieId.class);
        job2.setMapperClass(MapWithJoin.class);
        //job2.setCombinerClass(Reduce.class);
        job2.setReducerClass(ReduceFinal.class);

        job2.setInputFormatClass(TextInputFormat.class);
        job2.setOutputFormatClass(TextOutputFormat.class);

        FileInputFormat.addInputPath(job2, new Path(args[3]));
        FileOutputFormat.setOutputPath(job2, new Path(args[4]));
        job2.waitForCompletion(true);
    }
}

---

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);/*  w  ww  .  j a va 2s. c  om*/
    }
    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);/*w  w  w .  j  ava 2 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);//from www  .j  a  va  2 s  .co  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);/*from  w ww.ja  v a 2s.  co m*/
    }
    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);
}

---

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