当我指定IntWritable时，为什么我的map reduce程序在文本中给我输出

Question

我的测试集是：

Onida|Lucid|18|Uttar Pradesh|232401|16200
Akai|Decent|16|Kerala|922401|12200
Lava|Attention|20|Assam|454601|24200
Zen|Super|14|Maharashtra|619082|9200
Samsung|Optima|14|Madhya Pradesh|132401|14200

我的映射器类：

public class UnitsSoldPerCompanyMapper extends Mapper<LongWritable,Text,Text,Text>{

    public void map(LongWritable inputKey, Text inputValue,Context context) throws IOException, InterruptedException{
        String[] lineArray= inputValue.toString().split("\\|");
        Text companyName = new Text(lineArray[0]);
        Text productName = new Text(lineArray[1]);
        context.write(companyName,productName);
    }
}

减速器类：

public class UnitsSoldPerCompanyReducer extends Reducer<Text,Iterable<Text>,Text,IntWritable>{

    public void reduce(Text companyKey,Iterable<Text> productName,Context context) throws IOException, InterruptedException{

        IntWritable counter1= new IntWritable();
        int counter =0;

        for(Text values : productName ){
            System.out.println(values);
            counter++;
        }
        counter1.set(counter);
        //IntWritable sum= new IntWritable(counter);
        context.write(companyKey, new IntWritable(1));
    }
}

驱动类别：

public class UnitsSoldPerCompanyDriver {

public static void main(String[] args) throws IOException, ClassNotFoundException, InterruptedException {

    Configuration conf = new Configuration();// To set job related
                                                // configuration

    // @SuppressWarnings("deprecation")
    @SuppressWarnings("deprecation")
    Job job = new Job(conf, "TaskofJob");
    job.setJarByClass(UnitsSoldPerCompanyDriver.class);

    // Job job = new Job(conf,"TvSalesAcrossLocations");

    FileInputFormat.addInputPath(job, new Path(args[0]));
    FileOutputFormat.setOutputPath(job, new Path(args[1]));

    job.setMapperClass(UnitsSoldPerCompanyMapper.class);
    job.setReducerClass(UnitsSoldPerCompanyReducer.class);

    BasicConfigurator.configure();
    job.setMapOutputKeyClass(Text.class);
    job.setMapOutputValueClass(Text.class);

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

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

    job.waitForCompletion(true);

}

我被放为：

Akai    Decent
Lava    Attention
Lava    Attention
Lava    Attention
NA  Lucid
Onida   NA
Onida   Decent
Onida   Lucid
Onida   Lucid
Samsung Super
Samsung Super
Samsung Super
Samsung Decent
Samsung Optima
Samsung Optima
Samsung Optima

而我正在尝试查找每个公司出售的单位。

Answer 1

我相信输出是由身份（默认值）reduce（仅输出带有制表符的映射器键和值）而不是您的生成。 不知道为什么会这样，但是我怀疑BasicConfigurator.configure（）;

在ResourceManager UI中，您可以验证mapred.reducer.class，转到作业，然后在左侧菜单上查看所使用的实际作业属性。

Answer 2

我错误地扩展了原本应该是Reducer的Reducer，Text，IntWritable>

由于我没有将@Override注释用于reduce方法，因此这并非针对编译时。