mapreduce序列化操作
作者:互联网
1. 需求
统计每一个手机号耗费的总上行流量、下行流量、总流量
(1)输入数据
(2)输入数据格式:
7 13560436666 120.196.100.99 1116 954 200 id 手机号码 网络ip 上行流量 下行流量 网络状态码 |
(3)期望输出数据格式
13560436666 1116 954 2070 手机号码 上行流量 下行流量 总流量 |
2.编写MapReduce程序
package com.atguigu.mapreduce.flowsum; import java.io.DataInput; import java.io.DataOutput; import java.io.IOException; import org.apache.hadoop.io.Writable; // 1 实现writable接口 public class FlowBean implements Writable{ private long upFlow; private long downFlow; private long sumFlow; //2 反序列化时,需要反射调用空参构造函数,所以必须有 public FlowBean() { super(); } public FlowBean(long upFlow, long downFlow) { super(); this.upFlow = upFlow; this.downFlow = downFlow; this.sumFlow = upFlow + downFlow; } //3 写序列化方法 @Override public void write(DataOutput out) throws IOException { out.writeLong(upFlow); out.writeLong(downFlow); out.writeLong(sumFlow); } //4 反序列化方法 //5 反序列化方法读顺序必须和写序列化方法的写顺序必须一致 @Override public void readFields(DataInput in) throws IOException { this.upFlow = in.readLong(); this.downFlow = in.readLong(); this.sumFlow = in.readLong(); } // 6 编写toString方法,方便后续打印到文本 @Override public String toString() { return upFlow + "\t" + downFlow + "\t" + sumFlow; } public long getUpFlow() { return upFlow; } public void setUpFlow(long upFlow) { this.upFlow = upFlow; } public long getDownFlow() { return downFlow; } public void setDownFlow(long downFlow) { this.downFlow = downFlow; } public long getSumFlow() { return sumFlow; } public void setSumFlow(long sumFlow) { this.sumFlow = sumFlow; } }
(2)编写Mapper类
package com.atguigu.mapreduce.flowsum; import java.io.IOException; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper; public class FlowCountMapper extends Mapper<LongWritable, Text, Text, FlowBean>{ FlowBean v = new FlowBean(); Text k = new Text(); @Override protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { // 1 获取一行 String line = value.toString(); // 2 切割字段 String[] fields = line.split("\t"); // 3 封装对象 // 取出手机号码 String phoneNum = fields[1]; // 取出上行流量和下行流量 long upFlow = Long.parseLong(fields[fields.length - 3]); long downFlow = Long.parseLong(fields[fields.length - 2]); k.set(phoneNum); v.set(downFlow, upFlow); // 4 写出 context.write(k, v); } }
(3)编写Reducer类
package com.atguigu.mapreduce.flowsum; import java.io.IOException; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Reducer; public class FlowCountReducer extends Reducer<Text, FlowBean, Text, FlowBean> { @Override protected void reduce(Text key, Iterable<FlowBean> values, Context context)throws IOException, InterruptedException { long sum_upFlow = 0; long sum_downFlow = 0; // 1 遍历所用bean,将其中的上行流量,下行流量分别累加 for (FlowBean flowBean : values) { sum_upFlow += flowBean.getUpFlow(); sum_downFlow += flowBean.getDownFlow(); } // 2 封装对象 FlowBean resultBean = new FlowBean(sum_upFlow, sum_downFlow); // 3 写出 context.write(key, resultBean); } }
(4)编写Driver驱动类
package com.atguigu.mapreduce.flowsum; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.lib.input.FileInputFormat; import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat; public class FlowsumDriver { public static void main(String[] args) throws IllegalArgumentException, IOException, ClassNotFoundException, InterruptedException { // 输入输出路径需要根据自己电脑上实际的输入输出路径设置 args = new String[] { "e:/input/inputflow", "e:/output1" }; // 1 获取配置信息,或者job对象实例 Configuration configuration = new Configuration(); Job job = Job.getInstance(configuration); // 6 指定本程序的jar包所在的本地路径 job.setJarByClass(FlowsumDriver.class); // 2 指定本业务job要使用的mapper/Reducer业务类 job.setMapperClass(FlowCountMapper.class); job.setReducerClass(FlowCountReducer.class); // 3 指定mapper输出数据的kv类型 job.setMapOutputKeyClass(Text.class); job.setMapOutputValueClass(FlowBean.class); // 4 指定最终输出的数据的kv类型 job.setOutputKeyClass(Text.class); job.setOutputValueClass(FlowBean.class); // 5 指定job的输入原始文件所在目录 FileInputFormat.setInputPaths(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); // 7 将job中配置的相关参数,以及job所用的java类所在的jar包, 提交给yarn去运行 boolean result = job.waitForCompletion(true); System.exit(result ? 0 : 1); } }
标签:downFlow,upFlow,mapreduce,long,job,import,操作,序列化,public 来源: https://www.cnblogs.com/837634902why/p/11455590.html