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

Introduction

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

Prototype

public void setMapOutputValueClass(Class<?> theClass) throws IllegalStateException 

Source Link

Document

Set the value class for the map output data.

Usage

From source file:BuildPersonalizedPageRankRecords.java

License:Apache License

/**
 * Runs this tool./* ww w.ja  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("path").hasArg().withDescription("output path").create(OUTPUT));
    options.addOption(
            OptionBuilder.withArgName("num").hasArg().withDescription("number of nodes").create(NUM_NODES));
    //parsing more than 1 integer later;
    options.addOption(
            OptionBuilder.withArgName("src").hasArg().withDescription("source of pagerank").create(SOURCES));

    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(NUM_NODES)
            || !cmdline.hasOption(SOURCES)) {
        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(NUM_NODES));
    //Change to array later
    String src = cmdline.getOptionValue(SOURCES);

    LOG.info("Tool name: " + BuildPersonalizedPageRankRecords.class.getSimpleName());
    LOG.info(" - inputDir: " + inputPath);
    LOG.info(" - outputDir: " + outputPath);
    LOG.info(" - numNodes: " + n);

    Configuration conf = getConf();
    conf.setInt(NODE_CNT_FIELD, n);
    //more to be set later;
    conf.set(NODE_SRC, src);
    conf.setInt("mapred.min.split.size", 1024 * 1024 * 1024);

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

    job.setNumReduceTasks(0);

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

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

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

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

    job.setMapperClass(MyMapper.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:RunPersonalizedPageRankBasic.java

License:Apache License

private void phase1(int i, int j, String basePath, int numNodes, boolean useCombiner,
        boolean useInMapperCombiner) throws Exception {
    Job job = Job.getInstance(getConf());
    job.setJobName("PageRank:Basic:iteration" + j + ":Phase1");
    job.setJarByClass(RunPersonalizedPageRankBasic.class);

    String in = basePath + "/iter" + formatter.format(i);
    String out = basePath + "/iter" + formatter.format(j);
    //String outm = out + "-mass";

    // We need to actually count the number of part files to get the number of partitions (because
    // the directory might contain _log).
    int numPartitions = 0;
    for (FileStatus s : FileSystem.get(getConf()).listStatus(new Path(in))) {
        if (s.getPath().getName().contains("part-"))
            numPartitions++;//from   www  . j a  v a  2s.c om
    }

    LOG.info("PageRank: iteration " + j + ": Phase1");
    LOG.info(" - input: " + in);
    LOG.info(" - output: " + out);
    LOG.info(" - nodeCnt: " + numNodes);
    LOG.info(" - useCombiner: " + useCombiner);
    LOG.info(" - useInmapCombiner: " + useInMapperCombiner);
    LOG.info("computed number of partitions: " + numPartitions);

    int numReduceTasks = numPartitions;

    job.getConfiguration().setInt("NodeCount", numNodes);
    job.getConfiguration().setBoolean("mapred.map.tasks.speculative.execution", false);
    job.getConfiguration().setBoolean("mapred.reduce.tasks.speculative.execution", false);
    //job.getConfiguration().set("mapred.child.java.opts", "-Xmx2048m");
    //job.getConfiguration().set("PageRankMassPath", outm);

    job.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(job, new Path(in));
    FileOutputFormat.setOutputPath(job, new Path(out));

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

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

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

    job.setMapperClass(/*useInMapperCombiner ? MapWithInMapperCombiningClass.class : */MapClass.class);

    if (useCombiner) {
        job.setCombinerClass(CombineClass.class);
    }

    job.setReducerClass(ReduceClass.class);

    FileSystem.get(getConf()).delete(new Path(out), true);
    //FileSystem.get(getConf()).delete(new Path(outm), true);

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

    //ArrayList<Float> mass;
    /*float[] masslist;
    FileSystem fs = FileSystem.get(getConf());
    int flag=0
    for (FileStatus f : fs.listStatus(new Path(outm))) {
      FSDataInputStream fin = fs.open(f.getPath());
      while(fin.available()>0)
      {      
        if (flag==0)
        {
           mass.add(fin.readFloat());
           flag++;
        }
               
      }
      fin.close();
    }
            
    return mass;*/
}

---

From source file:inMapperStripes.java

License:Apache License

/**
 * Runs this tool./*from   w  w w.  j ava 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("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: " + inMapperStripes.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(inMapperStripes.class.getSimpleName());
    job.setJarByClass(inMapperStripes.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.setMapOutputValueClass(HMapSIW.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(FloatWritable.class);

    job.setMapperClass(MyMapper.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:RecordExtracting.java

License:Apache License

/**
 * Runs this tool./*  w ww.j av 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("path").hasArg()
         .withDescription("output path").create(OUTPUT));
     options.addOption(OptionBuilder.withArgName("num").hasArg()
         .withDescription("number of nodes").create(NUM_NODES));
     //parsing more than 1 integer later;*/
    options.addOption(
            OptionBuilder.withArgName("src").hasArg().withDescription("spamming users").create(SOURCES));
    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) || !cmdline.hasOption(NUM_NODES)||!cmdline.hasOption(SOURCES)) {
       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 = "xzzqskfinal/reviewsNew.txt";//cmdline.getOptionValue(INPUT);
    String outputPath = "xzzqskfinal/SpammingRecord";//cmdline.getOptionValue(OUTPUT);
    //int n = Integer.parseInt(cmdline.getOptionValue(NUM_NODES));
    //Change to array later
    String src = cmdline.getOptionValue(SOURCES);
    int reduceTasks = cmdline.hasOption(NUM_REDUCERS) ? Integer.parseInt(cmdline.getOptionValue(NUM_REDUCERS))
            : 1;

    LOG.info("Tool name: " + RecordExtracting.class.getSimpleName());
    LOG.info(" - inputDir: " + inputPath);
    LOG.info(" - outputDir: " + outputPath);
    //LOG.info(" - numNodes: " + n);

    Configuration conf = getConf();

    conf.set("mapreduce.map.memory.mb", "2048");
    conf.set("mapreduce.map.java.opts", "-Xmx2048m");
    conf.set("mapreduce.reduce.memory.mb", "2048");
    conf.set("mapreduce.reduce.java.opts", "-Xmx2048m");
    //conf.setInt(NODE_CNT_FIELD, n);
    //more to be set later;
    conf.set(NODE_SRC, src);
    conf.setInt("mapred.min.split.size", 1024 * 1024 * 1024);

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

    job.setNumReduceTasks(reduceTasks);

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

    job.setInputFormatClass(TextInputFormat.class);
    //job.setOutputFormatClass(TextOutputFormat.class);
    //job.setOutputFormatClass(SequenceFileOutputFormat.class);

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

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

    return 0;
}

---

From source file:RunPageRankBasic.java

License:Apache License

private float phase1(int i, int j, String basePath, int numNodes, boolean useCombiner,
        boolean useInMapperCombiner) throws Exception {
    Job job = Job.getInstance(getConf());
    job.setJobName("PageRank:Basic:iteration" + j + ":Phase1");
    job.setJarByClass(RunPageRankBasic.class);

    String in = basePath + "/iter" + formatter.format(i);
    String out = basePath + "/iter" + formatter.format(j) + "t";
    String outm = out + "-mass";

    // We need to actually count the number of part files to get the number of partitions (because
    // the directory might contain _log).
    int numPartitions = 0;
    for (FileStatus s : FileSystem.get(getConf()).listStatus(new Path(in))) {
        if (s.getPath().getName().contains("part-"))
            numPartitions++;/*w  ww. j  a va2 s.c o m*/
    }

    LOG.info("PageRank: iteration " + j + ": Phase1");
    LOG.info(" - input: " + in);
    LOG.info(" - output: " + out);
    LOG.info(" - nodeCnt: " + numNodes);
    LOG.info(" - useCombiner: " + useCombiner);
    LOG.info(" - useInmapCombiner: " + useInMapperCombiner);
    LOG.info("computed number of partitions: " + numPartitions);

    int numReduceTasks = numPartitions;

    job.getConfiguration().setInt("NodeCount", numNodes);
    job.getConfiguration().setBoolean("mapred.map.tasks.speculative.execution", false);
    job.getConfiguration().setBoolean("mapred.reduce.tasks.speculative.execution", false);
    //job.getConfiguration().set("mapred.child.java.opts", "-Xmx2048m");
    job.getConfiguration().set("PageRankMassPath", outm);

    job.setNumReduceTasks(numReduceTasks);

    FileInputFormat.setInputPaths(job, new Path(in));
    FileOutputFormat.setOutputPath(job, new Path(out));

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

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

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

    job.setMapperClass(useInMapperCombiner ? MapWithInMapperCombiningClass.class : MapClass.class);

    if (useCombiner) {
        job.setCombinerClass(CombineClass.class);
    }

    job.setReducerClass(ReduceClass.class);

    FileSystem.get(getConf()).delete(new Path(out), true);
    FileSystem.get(getConf()).delete(new Path(outm), true);

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

    float mass = Float.NEGATIVE_INFINITY;
    FileSystem fs = FileSystem.get(getConf());
    for (FileStatus f : fs.listStatus(new Path(outm))) {
        FSDataInputStream fin = fs.open(f.getPath());
        mass = sumLogProbs(mass, fin.readFloat());
        fin.close();
    }

    return mass;
}

---

From source file:RunPageRankBasic.java

License:Apache License

private void phase2(int i, int j, float missing, String basePath, int numNodes) throws Exception {
    Job job = Job.getInstance(getConf());
    job.setJobName("PageRank:Basic:iteration" + j + ":Phase2");
    job.setJarByClass(RunPageRankBasic.class);

    LOG.info("missing PageRank mass: " + missing);
    LOG.info("number of nodes: " + numNodes);

    String in = basePath + "/iter" + formatter.format(j) + "t";
    String out = basePath + "/iter" + formatter.format(j);

    LOG.info("PageRank: iteration " + j + ": Phase2");
    LOG.info(" - input: " + in);
    LOG.info(" - output: " + out);

    job.getConfiguration().setBoolean("mapred.map.tasks.speculative.execution", false);
    job.getConfiguration().setBoolean("mapred.reduce.tasks.speculative.execution", false);
    job.getConfiguration().setFloat("MissingMass", (float) missing);
    job.getConfiguration().setInt("NodeCount", numNodes);

    job.setNumReduceTasks(0);/*from  w ww.  jav  a2 s .  co m*/

    FileInputFormat.setInputPaths(job, new Path(in));
    FileOutputFormat.setOutputPath(job, new Path(out));

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

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

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

    job.setMapperClass(MapPageRankMassDistributionClass.class);

    FileSystem.get(getConf()).delete(new Path(out), true);

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

---

From source file:BigramRelativeFrequency.java

License:Apache License

/**
 * Runs this tool.//  w  w w .ja v  a  2s  .com
 */
@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: " + BigramRelativeFrequency.class.getSimpleName());
    LOG.info(" - input path: " + inputPath);
    LOG.info(" - output path: " + outputPath);
    LOG.info(" - num reducers: " + reduceTasks);

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

    job.setNumReduceTasks(reduceTasks);

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

    job.setMapOutputKeyClass(PairOfStrings.class);
    job.setMapOutputValueClass(FloatWritable.class);
    job.setOutputKeyClass(PairOfStrings.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:First.java

License:Apache License

public int run(String[] args) throws Exception {
    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];//from ww  w . j a va  2  s  . com
    }
    logger.info("output reducer type: " + outputReducerType);

    for (int i = 2000; i < 2012; i++) {
        String columnName = Integer.toString(i);
        getConf().set(CONF_COLUMN_NAME, columnName);

        Job job = new Job(getConf(), "app");
        job.setJarByClass(First.class);
        job.setMapperClass(TokenizerMapper.class);

        if (outputReducerType.equalsIgnoreCase("filesystem")) {
            job.setCombinerClass(ReducerToFilesystem.class);
            job.setReducerClass(ReducerToFilesystem.class);
            job.setOutputKeyClass(Text.class);
            job.setOutputValueClass(IntWritable.class);
            FileOutputFormat.setOutputPath(job, new Path(OUTPUT_PATH_PREFIX + i));
        } else {
            job.setReducerClass(ReducerToCassandra.class);

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

            job.setOutputFormatClass(ColumnFamilyOutputFormat.class);

            ConfigHelper.setOutputColumnFamily(job.getConfiguration(), KEYSPACE, OUTPUT_COLUMN_FAMILY);
        }

        job.setInputFormatClass(ColumnFamilyInputFormat.class);

        ConfigHelper.setRpcPort(job.getConfiguration(), "9160");
        ConfigHelper.setInitialAddress(job.getConfiguration(), "localhost");
        ConfigHelper.setPartitioner(job.getConfiguration(), "org.apache.cassandra.dht.RandomPartitioner");
        ConfigHelper.setInputColumnFamily(job.getConfiguration(), KEYSPACE, COLUMN_FAMILY);
        SlicePredicate predicate = new SlicePredicate()
                .setColumn_names(Arrays.asList(ByteBuffer.wrap(columnName.getBytes())));
        ConfigHelper.setInputSlicePredicate(job.getConfiguration(), predicate);

        job.waitForCompletion(true);
    }
    return 0;
}

---

From source file:MapReduce3.java

public static void main(String[] args) throws Exception {

    ////from   w ww  .j a v  a  2  s  . com
    String dst = "hdfs://localhost:9000/data/2006a.csv";

    //??
    //  String dstOut = "hdfs://localhost:9000/mapreduce/result3/1";
    String dstOut = "/Users/wendyzhuo/NetBeansProjects/final_Hadoop/src/output3/1";
    String outFiles = "/Users/wendyzhuo/NetBeansProjects/final_Hadoop/src/output3/2";
    Configuration hadoopConfig = new Configuration();

    hadoopConfig.set("fs.hdfs.impl", org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());

    hadoopConfig.set("fs.file.impl", org.apache.hadoop.fs.LocalFileSystem.class.getName());

    Job job = new Job(hadoopConfig);
    Job job2 = new Job(hadoopConfig);

    FileInputFormat.addInputPath(job, new Path(dst));
    FileOutputFormat.setOutputPath(job, new Path(dstOut));
    FileInputFormat.addInputPath(job2, new Path(dstOut));
    FileOutputFormat.setOutputPath(job2, new Path(outFiles));

    JobConf map1Conf = new JobConf(false);
    ChainMapper.addMapper(job, TempMapper.class, LongWritable.class, Text.class, CompositeKey_wd.class,
            IntWritable.class, map1Conf);
    JobConf reduceConf = new JobConf(false);
    ChainReducer.setReducer(job, TempReducer.class, CompositeKey_wd.class, IntWritable.class,
            CompositeKey_wd.class, IntWritable.class, reduceConf);

    JobConf map2Conf = new JobConf(false);
    ChainMapper.addMapper(job2, TempMapper2.class, LongWritable.class, Text.class, IntWritable.class,
            CompositeKey_wd.class, map2Conf);
    JobConf map3Conf = new JobConf(false);
    ChainReducer.setReducer(job2, TempReduce2.class, IntWritable.class, CompositeKey_wd.class, Text.class,
            IntWritable.class, map3Conf);
    //       
    //  JobClient.runJob(job);

    //MapperReducer?
    //        job.setMapperClass(TempMapper.class);
    //
    //        job.setReducerClass(TempReducer.class);

    //?KeyValue
    job.setOutputKeyClass(CompositeKey_wd.class);

    job.setOutputValueClass(IntWritable.class);

    job2.setMapOutputKeyClass(IntWritable.class);
    job2.setMapOutputValueClass(CompositeKey_wd.class);

    //  job2.setSortComparatorClass(LongWritable.DecreasingComparator.class);

    //job?
    job.waitForCompletion(true);
    System.out.println("Finished1");
    job2.waitForCompletion(true);
    System.out.println("Finished2");

}

---

From source file:WordCount.java

License:Apache License

public int run(String[] args) throws Exception {
    ///start//www.  j a  v  a  2 s. co  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;
}

---

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