public class AreaPartitioner<KEY, VALUE> extends Partitioner<KEY, VALUE>{

	private static HashMap<String,Integer> areaMap = new HashMap<String,Integer>();
	
	static{
		areaMap.put("135", 0);
		areaMap.put("136", 1);
		areaMap.put("137", 2);
		areaMap.put("138", 3);
		areaMap.put("139", 4);
	}
	
	@Override
	public int getPartition(KEY key, VALUE value, int arg2) {
		// TODO Auto-generated method stub
		//從key中拿到手機號，查詢手機歸屬地字典，不同的省份返回不同的組號
		String num = key.toString().substring(0, 3);
		int code = areaMap.get(num)==null?5:areaMap.get(num);
		return code;
	}

}




/*********************************FlowSumArea.java*********************************************************/





package com.hadoop.hdfs.mr.areapartition;

import java.io.IOException;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;

import com.hadoop.hdfs.mr.flowsum.FlowBean;

public class FlowSumArea {

	public static class FlowSumAreaMapper extends Mapper<LongWritable, Text, Text, FlowBean>{

		@Override
		protected void map(LongWritable key, Text value, Context context)
				throws IOException, InterruptedException {
			// TODO Auto-generated method stub
			//第一行資料
			String line = value.toString();
			
			//切分
			String[] fields = line.split("\t");
			
			//拿到需要的資料
			String phoneNB = fields[1];
			long u_flow = Long.parseLong(fields[7]);
			long d_flow = Long.parseLong(fields[8]);
			
			//封裝資料為kv形式
			context.write(new Text(phoneNB), new FlowBean(phoneNB, u_flow, d_flow));
		}
		
	}
	
	
	public static class FlowSumAreaReduce extends Reducer<Text, FlowBean, Text, FlowBean>{

		protected void reduce(Text text, Iterable<FlowBean> values,Context context)
				throws IOException, InterruptedException {
			// TODO Auto-generated method stub
			long u_count = 0;
			long d_count = 0 ;
			
			for (FlowBean bean : values){
				u_count+=bean.getUp_flow();
				d_count+=bean.getD_flow();
			}

			context.write(new Text(text), new FlowBean(text.toString(), u_count, d_count));
		}
		
	}
	
	public static void main(String[] args) throws Exception {
		
		Job job = Job.getInstance(new Configuration());
		
		job.setJarByClass(FlowSumArea.class);
		
		job.setMapperClass(FlowSumAreaMapper.class);
		job.setReducerClass(FlowSumAreaReduce.class);
		
		//設定自定義的分組邏輯定義
		job.setPartitionerClass(AreaPartitioner.class);
		
		
		job.setOutputKeyClass(Text.class);
		job.setOutputValueClass(FlowBean.class);
		
		//設定reduce 的任務併發數，跟分組的數量保持一致
		job.setNumReduceTasks(6);
		
		FileInputFormat.setInputPaths(job, new Path(args[0]));
		FileOutputFormat.setOutputPath(job, new Path(args[1]));
		
		int status = job.waitForCompletion(true)?0:1;
		System.exit(status);
	}
}