Java Code Examples for org.apache.hadoop.mapreduce.Job#setSortComparatorClass()

public static boolean runWithJob(Job job, String out_path) throws IOException, InterruptedException, ClassNotFoundException {
  job.setJarByClass(merge_results_driver.class);

  job.setJobName("Final Step: Merging results and creating separate LU decomposed components of input matrix");

  FileOutputFormat.setOutputPath(job, new Path(out_path));

  job.setMapperClass(lud.naiveGaussian.mergeResults.merge_results_mapper.class);
  job.setReducerClass(lud.naiveGaussian.mergeResults.merge_results_reducer.class);
  job.setMapOutputKeyClass(TextPair.class);
  job.setMapOutputValueClass(Text.class);
  job.setOutputKeyClass(TextPair.class);
  job.setOutputValueClass(Text.class);
  job.setPartitionerClass(TextPairPartitioner.class);
     job.setGroupingComparatorClass(NaturalKeyGroupingComparator.class);
     job.setSortComparatorClass(TextPairComparator.class);
     
     boolean success = job.waitForCompletion(true);
  return success;
}
 

public static boolean runWithJob(Job job, String out_path) throws IOException, InterruptedException, ClassNotFoundException {
  job.setJarByClass(merge_results_driver.class);

  job.setJobName("Final Step: Merging results and creating separate LU decomposed components of input matrix");

  FileOutputFormat.setOutputPath(job, new Path(out_path));

  job.setMapperClass(lu_decomposition.naive_gausssian.MergeResults.merge_results_mapper.class);
  job.setReducerClass(lu_decomposition.naive_gausssian.MergeResults.merge_results_reducer.class);
  job.setMapOutputKeyClass(TextPair.class);
  job.setMapOutputValueClass(Text.class);
  job.setOutputKeyClass(TextPair.class);
  job.setOutputValueClass(Text.class);
  job.setPartitionerClass(TextPairPartitioner.class);
     job.setGroupingComparatorClass(NaturalKeyGroupingComparator.class);
     job.setSortComparatorClass(TextPairComparator.class);
     
     boolean success = job.waitForCompletion(true);
  return success;
}
 

public static void runSortJob(Configuration conf, Path input, Path outputPath)
    throws Exception {

  Job job = new Job(conf);
  job.setJarByClass(Main.class);
  job.setMapperClass(SortMapReduce.Map.class);
  job.setReducerClass(SortMapReduce.Reduce.class);

  job.setInputFormatClass(KeyValueTextInputFormat.class);

  job.setMapOutputKeyClass(Person.class);
  job.setMapOutputValueClass(Person.class);

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

  job.setPartitionerClass(PersonNamePartitioner.class);
  job.setSortComparatorClass(PersonComparator.class);
  job.setGroupingComparatorClass(PersonNameComparator.class);

  FileInputFormat.setInputPaths(job, input);
  FileOutputFormat.setOutputPath(job, outputPath);

  job.waitForCompletion(true);
}
 

/**
 * The MapReduce driver - setup and launch the job.
 *
 * @param args the command-line arguments
 * @return the process exit code
 * @throws Exception if something goes wrong
 */
public int run(final String[] args) throws Exception {

  Cli cli = Cli.builder().setArgs(args).addOptions(CliCommonOpts.MrIoOpts.values()).build();
  int result = cli.runCmd();

  if (result != 0) {
    return result;
  }

  Path inputPath = new Path(cli.getArgValueAsString(CliCommonOpts.MrIoOpts.INPUT));
  Path outputPath = new Path(cli.getArgValueAsString(CliCommonOpts.MrIoOpts.OUTPUT));

  Configuration conf = super.getConf();
  Job job = new Job(conf);
  job.setJarByClass(SortMapReduce.class);

  job.setMapperClass(Map.class);
  job.setReducerClass(Reduce.class);

  job.setInputFormatClass(KeyValueTextInputFormat.class);

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

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

  job.setPartitionerClass(PersonNamePartitioner.class);
  job.setSortComparatorClass(PersonComparator.class);
  job.setGroupingComparatorClass(PersonNameComparator.class);

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

  if (job.waitForCompletion(true)) {
    return 0;
  }
  return 1;
}
 

@Override
public int run(String[] args) throws Exception {

    Configuration conf = getConf();
    String outpath = conf.get(OUTPUTPATH);
    
    Job job = new Job(conf, this.getClass().getSimpleName() + "_" + System.currentTimeMillis());
    job.setJarByClass(this.getClass());
    conf.setBoolean(MRJobConfig.MAPREDUCE_JOB_USER_CLASSPATH_FIRST, true);
    
    MultipleInputs.addInputPath(job, new Path(PROSPECTSOUT.getAbsolutePath()), 
            SequenceFileInputFormat.class, JoinSelectAggregateMapper.class);
    MultipleInputs.addInputPath(job,new Path(SPOOUT.getAbsolutePath()) , 
            SequenceFileInputFormat.class, JoinSelectAggregateMapper.class);
    job.setMapOutputKeyClass(CompositeType.class);
    job.setMapOutputValueClass(TripleCard.class);

    tempDir = new File(File.createTempFile(outpath, "txt").getParentFile(), System.currentTimeMillis() + "");
    SequenceFileOutputFormat.setOutputPath(job, new Path(tempDir.getAbsolutePath()));
    job.setOutputFormatClass(SequenceFileOutputFormat.class);
    job.setOutputKeyClass(TripleEntry.class);
    job.setOutputValueClass(CardList.class);


    job.setSortComparatorClass(JoinSelectSortComparator.class);
    job.setGroupingComparatorClass(JoinSelectGroupComparator.class);
    job.setPartitionerClass(JoinSelectPartitioner.class);
    job.setReducerClass(JoinReducer.class);
    job.setNumReduceTasks(32);
    job.waitForCompletion(true);
    
    return job.isSuccessful() ? 0 : 1;          
}
 

protected void configureMapper(Job job) {
  job.setInputFormatClass(OrcValueCombineFileInputFormat.class);
  job.setMapperClass(OrcValueMapper.class);
  job.setMapOutputKeyClass(OrcKey.class);
  job.setMapOutputValueClass(OrcValue.class);
  job.setGroupingComparatorClass(OrcKeyComparator.class);
  job.setSortComparatorClass(OrcKeyComparator.class);
}
 

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: MRSessionize <in> <out>");
        System.exit(2);
    }
    Job job = new Job(conf, "MapReduce Sessionization");
    job.setJarByClass(MRSessionize.class);
    job.setMapperClass(SessionizeMapper.class);
    job.setReducerClass(SessionizeReducer.class);

    // WARNING: do NOT set the Combiner class
    // from the same IP in one place before we can do sessionization
    // Also, our reducer doesn't return the same key,value types it takes
    // It can't be used on the result of a previous reducer

    job.setMapOutputKeyClass(IpTimestampKey.class);
    job.setMapOutputValueClass(Text.class);
    job.setOutputKeyClass(NullWritable.class);
    job.setOutputValueClass(Text.class);

    // We need these for secondary sorting.
    // We need to shuffle the records (between Map and Reduce phases) by using IP address as key, since that is
    // the field we are using for determining uniqueness of users. However, when the records arrive to the reducers,
    // we would like them to be sorted in ascending order of their timestamps. This concept is known as secondary
    // sorting since we are "secondarily" sorting the records by another key (timestamp, in our case) in addition
    // to the shuffle key (also called the "partition" key).

    // So, to get some terminology straight.
    // Natural key (aka Shuffle key or Partition key) is the key we use to shuffle. IP address in our case
    // Secondary Sorting Key is the key we use to sort within each partition that gets sent to the user. Timestamp
    // in our case.
    // Together, the natural key and secondary sorting key form what we call the composite key. This key is called
    // IpTimestampKey in our example.

    // For secondary sorting, even though we are partitioning and shuffling by only the natural key, the map output
    // key and the reduce input key is the composite key. We, however, use a custom partitioner and custom grouping
    // comparator that only uses the natural key part of the composite key to partition and group respectively (both
    // happen during the shuffle phase).

    // However, we have a different sort comparator which also gets used in the shuffle phase but determines how
    // the records are sorted when they enter the reduce phase. This custom sort comparator in our case will make use
    // of the entire composite key.

    // We found http://vangjee.wordpress.com/2012/03/20/secondary-sorting-aka-sorting-values-in-hadoops-mapreduce-programming-paradigm/
    // to be very helpful, if you'd like to read more on the subject.
    job.setPartitionerClass(NaturalKeyPartitioner.class);
    job.setGroupingComparatorClass(NaturalKeyComparator.class);
    job.setSortComparatorClass(CompositeKeyComparator.class);

    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}
 

protected int runHalvadeJob(Configuration halvadeConf, String tmpOutDir, int jobType) throws IOException, URISyntaxException, InterruptedException, ClassNotFoundException {
    String pipeline = "";
    if(jobType == HalvadeResourceManager.RNA_SHMEM_PASS2) {
        HalvadeConf.setIsPass2(halvadeConf, true);
        HalvadeResourceManager.setJobResources(halvadeOpts, halvadeConf, jobType, false, halvadeOpts.useBamInput);
        pipeline = RNA_PASS2;
    } else if(jobType == HalvadeResourceManager.DNA) {
        HalvadeResourceManager.setJobResources(halvadeOpts, halvadeConf, jobType, false, halvadeOpts.useBamInput);
        pipeline = DNA; 
    }
    halvadeOpts.splitChromosomes(halvadeConf, 0);
    HalvadeConf.setOutDir(halvadeConf, tmpOutDir);
    FileSystem outFs = FileSystem.get(new URI(tmpOutDir), halvadeConf);
    if (outFs.exists(new Path(tmpOutDir))) {
        Logger.INFO("The output directory \'" + tmpOutDir + "\' already exists.");
        Logger.INFO("ERROR: Please remove this directory before trying again.");
        System.exit(-2);
    }
    if(halvadeOpts.useBamInput)
        setHeaderFile(halvadeOpts.in, halvadeConf);     
    if(halvadeOpts.rnaPipeline)
        HalvadeConf.setPass2Suffix(halvadeConf, pass2suffix);
    
    Job halvadeJob = Job.getInstance(halvadeConf, "Halvade" + pipeline);
    halvadeJob.addCacheArchive(new URI(halvadeOpts.halvadeBinaries));
    halvadeJob.setJarByClass(be.ugent.intec.halvade.hadoop.mapreduce.HalvadeMapper.class);
    addInputFiles(halvadeOpts.in, halvadeConf, halvadeJob);
    FileOutputFormat.setOutputPath(halvadeJob, new Path(tmpOutDir));

    if(jobType == HalvadeResourceManager.RNA_SHMEM_PASS2) {
        halvadeJob.setMapperClass(be.ugent.intec.halvade.hadoop.mapreduce.StarAlignPassXMapper.class);
        halvadeJob.setReducerClass(be.ugent.intec.halvade.hadoop.mapreduce.RnaGATKReducer.class);
    } else if(jobType == HalvadeResourceManager.DNA){ 
        halvadeJob.setMapperClass(halvadeOpts.alignmentTools[halvadeOpts.aln]);
        halvadeJob.setReducerClass(be.ugent.intec.halvade.hadoop.mapreduce.DnaGATKReducer.class);
    }
    
    
    halvadeJob.setMapOutputKeyClass(ChromosomeRegion.class);
    halvadeJob.setMapOutputValueClass(SAMRecordWritable.class);
    halvadeJob.setInputFormatClass(HalvadeTextInputFormat.class);
    halvadeJob.setOutputKeyClass(Text.class);
    if(halvadeOpts.mergeBam) {
        halvadeJob.setSortComparatorClass(SimpleChrRegionComparator.class);
        halvadeJob.setOutputValueClass(SAMRecordWritable.class);
    }else {
        halvadeJob.setPartitionerClass(ChrRgPartitioner.class);
        halvadeJob.setSortComparatorClass(ChrRgSortComparator.class);
        halvadeJob.setGroupingComparatorClass(ChrRgGroupingComparator.class);
        halvadeJob.setOutputValueClass(VariantContextWritable.class);
    }

    if(halvadeOpts.justAlign && !halvadeOpts.mergeBam)
        halvadeJob.setNumReduceTasks(0);
    else if (halvadeOpts.mergeBam) {
        halvadeJob.setReducerClass(be.ugent.intec.halvade.hadoop.mapreduce.BamMergeReducer.class);
        halvadeJob.setNumReduceTasks(1);
    } else {
        halvadeJob.setNumReduceTasks(halvadeOpts.reduces); 
        if(halvadeOpts.countOnly) {
            halvadeJob.setReducerClass(be.ugent.intec.halvade.hadoop.mapreduce.CountReadsReducer.class);
            halvadeJob.setOutputValueClass(LongWritable.class);
        }
    }
    
    if(halvadeOpts.useBamInput) {
        halvadeJob.setMapperClass(be.ugent.intec.halvade.hadoop.mapreduce.AlignedBamMapper.class);
        halvadeJob.setInputFormatClass(BAMInputFormat.class);
    }
    
    return runTimedJob(halvadeJob, "Halvade Job");
}
 

@Override
public int run(String[] args) throws Exception {
    Job job = Job.getInstance(getConf());
    Configuration configuration = job.getConfiguration();

    job.setJarByClass(Aegisthus.class);
    CommandLine cl = getOptions(args);
    if (cl == null) {
        return 1;
    }

    // Check all of the paths and load the sstable version from the input filenames
    List<Path> paths = Lists.newArrayList();
    if (cl.hasOption(Feature.CMD_ARG_INPUT_FILE)) {
        for (String input : cl.getOptionValues(Feature.CMD_ARG_INPUT_FILE)) {
            paths.add(new Path(input));
        }
    }
    if (cl.hasOption(Feature.CMD_ARG_INPUT_DIR)) {
        paths.addAll(getDataFiles(configuration, cl.getOptionValue(Feature.CMD_ARG_INPUT_DIR)));
    }
    LOG.info("Processing paths: {}", paths);

    // At this point we have the version of sstable that we can use for this run
    Descriptor.Version version = Descriptor.Version.CURRENT;
    if (cl.hasOption(Feature.CMD_ARG_SSTABLE_OUTPUT_VERSION)) {
        version = new Descriptor.Version(cl.getOptionValue(Feature.CMD_ARG_SSTABLE_OUTPUT_VERSION));
    }
    configuration.set(Feature.CONF_SSTABLE_VERSION, version.toString());

    if (configuration.get(Feature.CONF_CQL_SCHEMA) != null) {
        setConfigurationFromCql(configuration);
    }

    if(cl.hasOption(Feature.CMD_ARG_COMBINE_SPLITS)) {
        job.setInputFormatClass(AegisthusCombinedInputFormat.class);
    } else {
        job.setInputFormatClass(AegisthusInputFormat.class);
    }
    job.setMapOutputKeyClass(AegisthusKey.class);
    job.setMapOutputValueClass(AtomWritable.class);
    job.setOutputKeyClass(AegisthusKey.class);
    job.setOutputValueClass(RowWritable.class);
    job.setMapperClass(AegisthusKeyMapper.class);
    job.setReducerClass(CassSSTableReducer.class);
    job.setGroupingComparatorClass(AegisthusKeyGroupingComparator.class);
    job.setPartitionerClass(AegisthusKeyPartitioner.class);
    job.setSortComparatorClass(AegisthusKeySortingComparator.class);

    TextInputFormat.setInputPaths(job, paths.toArray(new Path[paths.size()]));

    if (cl.hasOption(Feature.CMD_ARG_PRODUCE_SSTABLE)) {
        job.setOutputFormatClass(SSTableOutputFormat.class);
    } else {
        job.setOutputFormatClass(JsonOutputFormat.class);
    }
    CustomFileNameFileOutputFormat.setOutputPath(job, new Path(cl.getOptionValue(Feature.CMD_ARG_OUTPUT_DIR)));

    job.submit();
    if (configuration.getBoolean(Feature.CONF_SHUTDOWN_HOOK, true)) {
        Runtime.getRuntime().addShutdownHook(new JobKiller(job));
    }

    System.out.println(job.getJobID());
    System.out.println(job.getTrackingURL());
    boolean success = job.waitForCompletion(true);

    if (success) {
        Counter errorCounter = job.getCounters().findCounter("aegisthus", "error_skipped_input");
        long errorCount = errorCounter != null ? errorCounter.getValue() : 0L;
        int maxAllowed = configuration.getInt(Feature.CONF_MAX_CORRUPT_FILES_TO_SKIP, 0);
        if (errorCounter != null && errorCounter.getValue() > maxAllowed) {
            LOG.error("Found {} corrupt files which is greater than the max allowed {}", errorCount, maxAllowed);
            success = false;
        } else if (errorCount > 0) {
            LOG.warn("Found {} corrupt files but not failing the job because the max allowed is {}",
                    errorCount, maxAllowed);
        }
    }

    return success ? 0 : 1;
}
 

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: MRSessionize <in> <out>");
        System.exit(2);
    }
    Job job = new Job(conf, "MapReduce Sessionization");
    job.setJarByClass(MRSessionize.class);
    job.setMapperClass(SessionizeMapper.class);
    job.setReducerClass(SessionizeReducer.class);

    // WARNING: do NOT set the Combiner class
    // from the same IP in one place before we can do sessionization
    // Also, our reducer doesn't return the same key,value types it takes
    // It can't be used on the result of a previous reducer

    job.setMapOutputKeyClass(IpTimestampKey.class);
    job.setMapOutputValueClass(Text.class);
    job.setOutputKeyClass(NullWritable.class);
    job.setOutputValueClass(Text.class);

    // We need these for secondary sorting.
    // We need to shuffle the records (between Map and Reduce phases) by using IP address as key, since that is
    // the field we are using for determining uniqueness of users. However, when the records arrive to the reducers,
    // we would like them to be sorted in ascending order of their timestamps. This concept is known as secondary
    // sorting since we are "secondarily" sorting the records by another key (timestamp, in our case) in addition
    // to the shuffle key (also called the "partition" key).

    // So, to get some terminology straight.
    // Natural key (aka Shuffle key or Partition key) is the key we use to shuffle. IP address in our case
    // Secondary Sorting Key is the key we use to sort within each partition that gets sent to the user. Timestamp
    // in our case.
    // Together, the natural key and secondary sorting key form what we call the composite key. This key is called
    // IpTimestampKey in our example.

    // For secondary sorting, even though we are partitioning and shuffling by only the natural key, the map output
    // key and the reduce input key is the composite key. We, however, use a custom partitioner and custom grouping
    // comparator that only uses the natural key part of the composite key to partition and group respectively (both
    // happen during the shuffle phase).

    // However, we have a different sort comparator which also gets used in the shuffle phase but determines how
    // the records are sorted when they enter the reduce phase. This custom sort comparator in our case will make use
    // of the entire composite key.

    // We found http://vangjee.wordpress.com/2012/03/20/secondary-sorting-aka-sorting-values-in-hadoops-mapreduce-programming-paradigm/
    // to be very helpful, if you'd like to read more on the subject.
    job.setPartitionerClass(NaturalKeyPartitioner.class);
    job.setGroupingComparatorClass(NaturalKeyComparator.class);
    job.setSortComparatorClass(CompositeKeyComparator.class);

    FileInputFormat.addInputPath(job, new Path(otherArgs[0]));
    FileOutputFormat.setOutputPath(job, new Path(otherArgs[1]));
    System.exit(job.waitForCompletion(true) ? 0 : 1);
}
 

/**
 * After adding data to the table start a mr job to
 * @throws IOException
 * @throws ClassNotFoundException
 * @throws InterruptedException
 */
private void runCheck() throws IOException, ClassNotFoundException, InterruptedException {
  LOG.info("Running check");
  Configuration conf = getConf();
  String jobName = getTablename() + "_check" + EnvironmentEdgeManager.currentTime();
  Path p = util.getDataTestDirOnTestFS(jobName);

  Job job = new Job(conf);
  job.setJarByClass(getClass());
  job.setJobName(jobName);

  job.setPartitionerClass(NaturalKeyPartitioner.class);
  job.setGroupingComparatorClass(NaturalKeyGroupingComparator.class);
  job.setSortComparatorClass(CompositeKeyComparator.class);

  Scan scan = new Scan();
  scan.addFamily(CHAIN_FAM);
  scan.addFamily(SORT_FAM);
  scan.readVersions(1);
  scan.setCacheBlocks(false);
  scan.setBatch(1000);

  int replicaCount = conf.getInt(NUM_REPLICA_COUNT_KEY, NUM_REPLICA_COUNT_DEFAULT);
  if (replicaCount != NUM_REPLICA_COUNT_DEFAULT) {
    scan.setConsistency(Consistency.TIMELINE);
  }

  TableMapReduceUtil.initTableMapperJob(
      getTablename().getName(),
      scan,
      LinkedListCheckingMapper.class,
      LinkKey.class,
      LinkChain.class,
      job
  );

  job.setReducerClass(LinkedListCheckingReducer.class);
  job.setOutputKeyClass(NullWritable.class);
  job.setOutputValueClass(NullWritable.class);

  FileOutputFormat.setOutputPath(job, p);

  assertEquals(true, job.waitForCompletion(true));

  // Delete the files.
  util.getTestFileSystem().delete(p, true);
}
 

private void testComparator(String keySpec, int expect) 
    throws Exception {
  String root = System.getProperty("test.build.data", "/tmp");
  Path inDir = new Path(root, "test_cmp/in");
  Path outDir = new Path(root, "test_cmp/out");
  
  conf.set("mapreduce.partition.keycomparator.options", keySpec);
  conf.set("mapreduce.partition.keypartitioner.options", "-k1.1,1.1");
  conf.set(MRJobConfig.MAP_OUTPUT_KEY_FIELD_SEPERATOR, " ");

  Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 1,
              line1 +"\n" + line2 + "\n"); 
  job.setMapperClass(InverseMapper.class);
  job.setReducerClass(Reducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(LongWritable.class);
  job.setSortComparatorClass(KeyFieldBasedComparator.class);
  job.setPartitionerClass(KeyFieldBasedPartitioner.class);

  job.waitForCompletion(true);
  assertTrue(job.isSuccessful());

  // validate output
  Path[] outputFiles = FileUtil.stat2Paths(getFileSystem().listStatus(outDir,
      new Utils.OutputFileUtils.OutputFilesFilter()));
  if (outputFiles.length > 0) {
    InputStream is = getFileSystem().open(outputFiles[0]);
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    String line = reader.readLine();
    //make sure we get what we expect as the first line, and also
    //that we have two lines (both the lines must end up in the same
    //reducer since the partitioner takes the same key spec for all
    //lines
    if (expect == 1) {
      assertTrue(line.startsWith(line1));
    } else if (expect == 2) {
      assertTrue(line.startsWith(line2));
    }
    line = reader.readLine();
    if (expect == 1) {
      assertTrue(line.startsWith(line2));
    } else if (expect == 2) {
      assertTrue(line.startsWith(line1));
    }
    reader.close();
  }
}
 

private void testComparator(String keySpec, int expect) 
    throws Exception {
  String root = System.getProperty("test.build.data", "/tmp");
  Path inDir = new Path(root, "test_cmp/in");
  Path outDir = new Path(root, "test_cmp/out");
  
  conf.set("mapreduce.partition.keycomparator.options", keySpec);
  conf.set("mapreduce.partition.keypartitioner.options", "-k1.1,1.1");
  conf.set(MRJobConfig.MAP_OUTPUT_KEY_FIELD_SEPERATOR, " ");

  Job job = MapReduceTestUtil.createJob(conf, inDir, outDir, 1, 1,
              line1 +"\n" + line2 + "\n"); 
  job.setMapperClass(InverseMapper.class);
  job.setReducerClass(Reducer.class);
  job.setOutputKeyClass(Text.class);
  job.setOutputValueClass(LongWritable.class);
  job.setSortComparatorClass(KeyFieldBasedComparator.class);
  job.setPartitionerClass(KeyFieldBasedPartitioner.class);

  job.waitForCompletion(true);
  assertTrue(job.isSuccessful());

  // validate output
  Path[] outputFiles = FileUtil.stat2Paths(getFileSystem().listStatus(outDir,
      new Utils.OutputFileUtils.OutputFilesFilter()));
  if (outputFiles.length > 0) {
    InputStream is = getFileSystem().open(outputFiles[0]);
    BufferedReader reader = new BufferedReader(new InputStreamReader(is));
    String line = reader.readLine();
    //make sure we get what we expect as the first line, and also
    //that we have two lines (both the lines must end up in the same
    //reducer since the partitioner takes the same key spec for all
    //lines
    if (expect == 1) {
      assertTrue(line.startsWith(line1));
    } else if (expect == 2) {
      assertTrue(line.startsWith(line2));
    }
    line = reader.readLine();
    if (expect == 1) {
      assertTrue(line.startsWith(line2));
    } else if (expect == 2) {
      assertTrue(line.startsWith(line1));
    }
    reader.close();
  }
}
 

public static void main(String[] args) throws Exception {		
		//1.设置HDFS配置信息
		String namenode_ip = "192.168.17.10";
		String hdfs = "hdfs://" + namenode_ip + ":9000";			
		Configuration conf = new Configuration();
		conf.set("fs.defaultFS", hdfs);
		conf.set("mapreduce.app-submission.cross-platform", "true");

		//2.设置MapReduce作业配置信息
		String jobName = "DateSort2";					//定义作业名称
		Job job = Job.getInstance(conf, jobName);
		job.setJarByClass(DateSort2.class);				//指定作业类
		job.setJar("export\\DateSort2.jar");			//指定本地jar包
//		Map
		job.setMapperClass(DateSort2Mapper.class);		//指定Mapper类
		job.setMapOutputKeyClass(IntWritable.class);	//设置Mapper输出Key类型
		job.setMapOutputValueClass(Text.class);			//设置Mapper输出Value类型
//		Reduce
		job.setReducerClass(DateSort2Reducer.class);	//指定Reducer类
		job.setOutputKeyClass(Text.class);				//设置Reduce输出Key类型
		job.setOutputValueClass(IntWritable.class);		//设置Reduce输出Value类型
//		自定义Sort
		job.setSortComparatorClass(MySort.class);		//设置自定义排序类
		
		//3.设置作业输入和输出路径
		String dataDir = "/expr/datecount/output/part-r-00000";	//实验数据目录	
		String outputDir = "/expr/datecount/output_sort2";				//实验输出目录
		Path inPath = new Path(hdfs + dataDir);
		Path outPath = new Path(hdfs + outputDir);
		FileInputFormat.addInputPath(job, inPath);
		FileOutputFormat.setOutputPath(job, outPath);
		FileSystem fs = FileSystem.get(conf);
		if(fs.exists(outPath)) {
			fs.delete(outPath, true);
		}
		
		//4.运行作业
		System.out.println("Job: " + jobName + " is running...");
		if(job.waitForCompletion(true)) {
			System.out.println("success!");
			System.exit(0);
		} else {
			System.out.println("failed!");
			System.exit(1);
		}
	}
 

public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {
	// 1.设置HDFS配置信息
	String namenode_ip = "192.168.17.10";
	String hdfs = "hdfs://" + namenode_ip + ":9000";
	Configuration conf = new Configuration();
	conf.set("fs.defaultFS", hdfs);
	conf.set("mapreduce.app-submission.cross-platform", "true");

	// 2.设置MapReduce作业配置信息
	String jobName = "DateSortDesc"; // 定义作业名称
	Job job = Job.getInstance(conf, jobName);
	job.setJarByClass(DateSortAsc.class); // 指定作业类
	job.setJar("export\\DateSortDesc.jar"); // 指定本地jar包

	job.setMapperClass(SortMapper.class);
	job.setMapOutputKeyClass(IntWritable.class);
	job.setMapOutputValueClass(Text.class);
	job.setReducerClass(SortReducer.class);
	job.setOutputKeyClass(Text.class);
	job.setOutputValueClass(IntWritable.class);
	// 指定排序所使用的比较器
	job.setSortComparatorClass(MyComparator.class);

	// 3.设置作业输入和输出路径
	String dataDir = "/workspace/dateSort/data"; // 实验数据目录
	String outputDir = "/workspace/dateSort/output"; // 实验输出目录
	Path inPath = new Path(hdfs + dataDir);
	Path outPath = new Path(hdfs + outputDir);
	FileInputFormat.addInputPath(job, inPath);
	FileOutputFormat.setOutputPath(job, outPath);
	FileSystem fs = FileSystem.get(conf);
	if (fs.exists(outPath)) {
		fs.delete(outPath, true);
	}

	// 4.运行作业
	System.out.println("Job: " + jobName + " is running...");
	if (job.waitForCompletion(true)) {
		System.out.println("success!");
		System.exit(0);
	} else {
		System.out.println("failed!");
		System.exit(1);
	}

}
 

public static void runSortJob(String input, String output)
    throws Exception {
  Configuration conf = new Configuration();

  Job job = new Job(conf);
  job.setJarByClass(PersonSortMapReduce.class);

  job.setMapperClass(Map.class);
  job.setReducerClass(Reduce.class);

  job.setInputFormatClass(KeyValueTextInputFormat.class);

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

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

  job.setSortComparatorClass(PersonBinaryComparator.class);

  Path outputPath = new Path(output);

  FileInputFormat.setInputPaths(job, input);
  FileOutputFormat.setOutputPath(job, outputPath);

  outputPath.getFileSystem(conf).delete(outputPath, true);

  job.waitForCompletion(true);
}
 

public static void runSortJob(String input, String output)
    throws Exception {
  Configuration conf = new Configuration();

  Job job = new Job(conf);
  job.setJarByClass(CloneReduce.class);

  job.setReducerClass(Reduce.class);

  job.setInputFormatClass(KeyValueTextInputFormat.class);

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

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

  job.setSortComparatorClass(PersonBinaryComparator.class);

  Path outputPath = new Path(output);

  FileInputFormat.setInputPaths(job, input);
  FileOutputFormat.setOutputPath(job, outputPath);

  outputPath.getFileSystem(conf).delete(outputPath, true);

  job.waitForCompletion(true);
}
 

public static void runSortJob(String input, String output)
    throws Exception {
  Configuration conf = new Configuration();

  Job job = new Job(conf);
  job.setJarByClass(SampleMapReduce.class);

  job.setMapperClass(Map.class);
  job.setReducerClass(Reduce.class);

  job.setInputFormatClass(KeyValueTextInputFormat.class);

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

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

  job.setPartitionerClass(PersonNamePartitioner.class);
  job.setSortComparatorClass(PersonComparator.class);
  job.setGroupingComparatorClass(PersonNameComparator.class);

  Path outputPath = new Path(output);

  FileInputFormat.setInputPaths(job, input);
  FileOutputFormat.setOutputPath(job, outputPath);

  outputPath.getFileSystem(conf).delete(outputPath, true);

  job.waitForCompletion(true);
}
 

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

        Configuration conf = new Configuration(true);

        conf.set("mapreduce.framework.name","local");
        conf.set("mapreduce.app-submission.cross-platform","true");


        String[] other = new GenericOptionsParser(conf, args).getRemainingArgs();

        Job  job = Job.getInstance(conf);
        job.setJarByClass(MyTopN.class);

        job.setJobName("TopN");

        job.setJar("C:\\Users\\Administrator\\IdeaProjects\\msbhadoop\\target\\hadoop-hdfs-1.0-0.1.jar");
        //客户端规划的时候讲join的右表cache到mapTask出现的节点上
        job.addCacheFile(new Path("/data/topn/dict/dict.txt").toUri());





        //初学者，关注的是client端的代码梳理：因为把这块写明白了，其实你也就真的知道这个作业的开发原理；

        //maptask
        //input

        TextInputFormat.addInputPath(job,new Path(other[0]));

        Path outPath = new Path(other[1]);

        if(outPath.getFileSystem(conf).exists(outPath))  outPath.getFileSystem(conf).delete(outPath,true);
        TextOutputFormat.setOutputPath(job,outPath);


        //key
        //map
        job.setMapperClass(TMapper.class);
        job.setMapOutputKeyClass(TKey.class);
        job.setMapOutputValueClass(IntWritable.class);

        //partitioner  按  年，月  分区  -》  分区 > 分组  按 年分区！！！！！！
            //分区器潜台词：满足  相同的key获得相同的分区号就可以~！
        job.setPartitionerClass(TPartitioner.class);
        //sortComparator  年，月，温度  且  温度倒序
        job.setSortComparatorClass(TSortComparator.class);
        //combine
//        job.setCombinerClass();




        //reducetask
        //groupingComparator
        job.setGroupingComparatorClass(TGroupingComparator.class);
        //reduce
        job.setReducerClass(TReducer.class);

        job.waitForCompletion(true);



    }
 

/**
     * @throws Exception If failed.
     */
    @Test
    public void testSortSimple() throws Exception {
        // Generate test data.
        Job job = Job.getInstance();

        job.setInputFormatClass(InFormat.class);

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

        job.setMapperClass(Mapper.class);
        job.setNumReduceTasks(0);

        setupFileSystems(job.getConfiguration());

        FileOutputFormat.setOutputPath(job, new Path(igfsScheme() + PATH_INPUT));

        X.printerrln("Data generation started.");

        grid(0).hadoop().submit(new HadoopJobId(UUID.randomUUID(), 1),
            createJobInfo(job.getConfiguration(), null)).get(180000);

        X.printerrln("Data generation complete.");

        // Run main map-reduce job.
        job = Job.getInstance();

        setupFileSystems(job.getConfiguration());

        job.getConfiguration().set(CommonConfigurationKeys.IO_SERIALIZATIONS_KEY, JavaSerialization.class.getName() +
            "," + WritableSerialization.class.getName());

        FileInputFormat.setInputPaths(job, new Path(igfsScheme() + PATH_INPUT));
        FileOutputFormat.setOutputPath(job, new Path(igfsScheme() + PATH_OUTPUT));

        job.setSortComparatorClass(JavaSerializationComparator.class);

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

        job.setNumReduceTasks(2);

        job.setMapOutputKeyClass(UUID.class);
        job.setMapOutputValueClass(NullWritable.class);

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

        X.printerrln("Job started.");

        grid(0).hadoop().submit(new HadoopJobId(UUID.randomUUID(), 2),
            createJobInfo(job.getConfiguration(), null)).get(180000);

        X.printerrln("Job complete.");

        // Check result.
        Path outDir = new Path(igfsScheme() + PATH_OUTPUT);

        AbstractFileSystem fs = AbstractFileSystem.get(new URI(igfsScheme()), job.getConfiguration());

        for (FileStatus file : fs.listStatus(outDir)) {
            X.printerrln("__ file: " + file);

            if (file.getLen() == 0)
                continue;

            FSDataInputStream in = fs.open(file.getPath());

            Scanner sc = new Scanner(in);

            UUID prev = null;

            while (sc.hasNextLine()) {
                UUID next = UUID.fromString(sc.nextLine());

//                X.printerrln("___ check: " + next);

                if (prev != null)
                    assertTrue(prev.compareTo(next) < 0);

                prev = next;
            }
        }
    }