每日日报2021 10/4

今日份偷懒结束，我学了一点点东西。

这是hadoop用来实例化的。

package com.atguigu.mapreduce.partitioner;

import org.apache.hadoop.io.Text;

import org.apache.hadoop.mapreduce.Partitioner;

public class ProvincePartitioner extends Partitioner<Text, FlowBean> {

@Override

public int getPartition(Text text, FlowBean flowBean, int numPartitions)

{

//获取手机号前三位 prePhone

String phone = text.toString();

String prePhone = phone.substring(0, 3);

//定义一个分区号变量 partition,根据 prePhone 设置分区号

int partition;

if("136".equals(prePhone)){

partition = 0;

}else if("137".equals(prePhone)){

partition = 1;

}else if("138".equals(prePhone)){

partition = 2;

}else if("139".equals(prePhone)){

partition = 3;

}else {

partition = 4;

}

//最后返回分区号 partition

return partition;

}

}