示例#1
0
  public static void main(String[] args) throws Exception {

    final String NAME_NODE = "hdfs://sandbox.hortonworks.com:8020";
    Configuration conf = new Configuration();
    Job job = Job.getInstance(conf);
    job.setJarByClass(WordCount.class);
    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(IntWritable.class);
    job.setOutputKeyClass(IntWritable.class);
    job.setOutputValueClass(NullWritable.class);
    if (args.length > 2) {
      job.setNumReduceTasks(Integer.parseInt(args[2]));
    }

    job.setMapperClass(CountMapper.class);
    job.setReducerClass(CountReducer.class);
    job.setJarByClass(WordCount.class);
    job.setNumReduceTasks(1);

    FileInputFormat.addInputPath(job, new Path(args[0] + "data/plot_summaries.txt"));
    FileSystem fs = FileSystem.get(conf);
    // handle (e.g. delete) existing output path
    Path outputDestination = new Path(args[0] + args[1]);
    if (fs.exists(outputDestination)) {
      fs.delete(outputDestination, true);
    }

    // set output path & start job1
    FileOutputFormat.setOutputPath(job, outputDestination);
    int jobCompletionStatus = job.waitForCompletion(true) ? 0 : 1;
  }
 private void generateSaltIfNeeded(Path saltFilePath, Path secretsPath) throws Exception {
   FileSystem fileSystem = FileSystem.get(saltFilePath.toUri(), getConf());
   if (!fileSystem.exists(saltFilePath)) {
     FSDataOutputStream outputStream = fileSystem.create(saltFilePath);
     BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(outputStream));
     int numSaltsToGenerate = getNumSecrets(secretsPath);
     System.out.printf("Generating %d salts\n", numSaltsToGenerate);
     for (int i = 0; i < numSaltsToGenerate; i++) {
       writer.write(BCrypt.gensalt());
       writer.newLine();
     }
     writer.close();
     outputStream.close();
   }
 }