Example usage for org.apache.hadoop.mapreduce CounterGroup getUnderlyingGroup

Introduction

In this page you can find the example usage for org.apache.hadoop.mapreduce CounterGroup getUnderlyingGroup.

Prototype

@Private
    
    CounterGroupBase<T> getUnderlyingGroup();

Source Link

Usage

From source file:dz.lab.mapred.counter.StartsWithCountJob_PrintCounters.java

@Override
public int run(String[] args) throws Exception {
    Configuration conf = getConf();
    // the following property will enable mapreduce to use its packaged local job runner
    //conf.set("mapreduce.framework.name", "local");

    Job job = Job.getInstance(conf, "StartsWithCountJob");
    job.setJarByClass(getClass());//from   www.  j a v  a  2  s  .c o m

    // configure output and input source
    TextInputFormat.addInputPath(job, new Path(args[0]));
    job.setInputFormatClass(TextInputFormat.class);

    // configure mapper and reducer
    job.setMapperClass(StartsWithCountMapper.class);
    job.setCombinerClass(StartsWithCountReducer.class);
    job.setReducerClass(StartsWithCountReducer.class);

    // configure output
    TextOutputFormat.setOutputPath(job, new Path(args[1]));
    job.setOutputFormatClass(TextOutputFormat.class);
    job.setOutputKeyClass(Text.class);
    job.setOutputValueClass(IntWritable.class);

    int resultCode = job.waitForCompletion(true) ? 0 : 1;
    System.out.println("Job is complete! Printing Counters:");
    Counters counters = job.getCounters();

    for (String groupName : counters.getGroupNames()) {
        CounterGroup group = counters.getGroup(groupName);
        System.out.println(group.getDisplayName());

        for (Counter counter : group.getUnderlyingGroup()) {
            System.out.println(" " + counter.getDisplayName() + "=" + counter.getValue());
        }
    }
    return resultCode;
}

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