HadoopWordCount.java 文件源码

public static void main(String[] args) throws Exception {
    BasicConfigurator.configure();
    Configuration conf = new Configuration();
    conf.setQuietMode(true);

    Job job = Job.getInstance(conf, "WordCount");
    job.setJarByClass(HadoopWordCount.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.setInputPaths(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1] + "_" + System.currentTimeMillis()));

    long t = System.currentTimeMillis();
    job.waitForCompletion(true);

    System.out.println("TotalTime=" + (System.currentTimeMillis() - t));
}