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要求

对上一个输出的结果，按照upPackNo顺序排列

代码实现

实体类

public class TelphoneName implements  Writable{    private String phoneNo;    private int upPackNo;    private int downPackNo;    private int upPayLoad;    private int downPayLoad;    public String getPhoneNo() {        return phoneNo;    }    public void setPhoneNo(String phoneNo) {        this.phoneNo = phoneNo;    }    public int getUpPackNo() {        return upPackNo;    }    public void setUpPackNo(int upPackNo) {        this.upPackNo = upPackNo;    }    public int getDownPackNo() {        return downPackNo;    }    public void setDownPackNo(int downPackNo) {        this.downPackNo = downPackNo;    }    public int getUpPayLoad() {        return upPayLoad;    }    public void setUpPayLoad(int upPayLoad) {        this.upPayLoad = upPayLoad;    }    public int getDownPayLoad() {        return downPayLoad;    }    public void setDownPayLoad(int downPayLoad) {        this.downPayLoad = downPayLoad;    }    public TelphoneName(){    }    public TelphoneName(String phoneNo,int upPackNo,int downPackNo,int upPayLoad,int downPayLoad){        this.phoneNo = phoneNo;        this.upPackNo = upPackNo;        this.downPackNo = downPackNo;        this.upPayLoad = upPayLoad;        this.downPayLoad = downPayLoad;    }    public TelphoneName(String[] split){        this(split[1], Integer.parseInt(split[6]), Integer.parseInt(split[7]),Integer.parseInt(split[8]),Integer.parseInt(split[9]));    }    @Override    public void write(DataOutput out) throws IOException {        out.writeUTF(phoneNo);        out.writeInt(upPackNo);        out.writeInt(downPackNo);        out.writeInt(upPayLoad);        out.writeInt(downPayLoad);    }    @Override    public void readFields(DataInput in) throws IOException {        phoneNo=in.readUTF();        upPackNo=in.readInt();        downPackNo=in.readInt();        upPayLoad=in.readInt();        downPayLoad=in.readInt();    }    @Override    public String toString() {        return upPackNo+"\t"+downPackNo+"\t"+upPayLoad+"\t"+downPayLoad;    }}

TrafficCountMapper 

public class TrafficCountMapper extends Mapper
   
     {    @Override    protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {        String[] split = value.toString().split("\\s");        context.write(new Text(split[1]),new TelphoneName(split));    }}
   

TrafficCountReducer 

public class TrafficCountReducer extends Reducer
   
     {    List
    
      list = new ArrayList<>();    @Override    protected void reduce(Text key, Iterable
     
       values, Context context) throws IOException, InterruptedException {        int upPackNo =0;        int downPackNo =0;        int upPayLoad =0;        int downPayLoad =0;        for(TelphoneName telphoneName:values){            upPackNo += telphoneName.getUpPackNo();            downPackNo += telphoneName.getDownPackNo();            upPayLoad += telphoneName.getUpPayLoad();            downPayLoad += telphoneName.getDownPayLoad();        }        TelphoneName telphoneName = new TelphoneName(key.toString(),upPackNo,downPackNo,upPayLoad,downPayLoad);        list.add(telphoneName);        //context.write(key,telphoneName);    }
     
    
   

驱动

//分区class MyPartitioner extends Partitioner
   
    {    @Override    public int getPartition(Text key, TelphoneName telphoneName, int i) {        String keyString = key.toString();        return (keyString.length()==11)?0:1;    }}public class Reducer {    public static void main(String[] args) throws Exception {        //实现一个job的实例        Configuration configuration = new Configuration();        Job job = Job.getInstance(configuration);        //设置jar加载路径        job.setJarByClass(Reducer.class);        //设置mapper 和reducer类路径        job.setMapperClass(TrafficCountMapper.class);        job.setReducerClass(TrafficCountReducer.class);        //设置mapper 输出        job.setMapOutputKeyClass(Text.class);        job.setMapOutputValueClass(TelphoneName.class);        //设置reducer输出        job.setOutputKeyClass(Text.class);        job.setOutputValueClass(TelphoneName.class);        //map阶段执行分区        job.setPartitionerClass(MyPartitioner.class);        job.setNumReduceTasks(2);        //设置输入输出        FileInputFormat.setInputPaths(job,new Path(args[0]));        FileOutputFormat.setOutputPath(job,new Path(args[1]));        //提交        job.waitForCompletion(true);    }}
   

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