Hadoop MapReduce编程 API入门系列之网页流量版本1（二十一）
不多说，直接上代码。对流量原始日志进行流量统计，将不同省份的用户统计结果输出到不同文件。
代码
package zhouls.bigdata.myMapReduce.areapartition;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;
public> private String phoneNB;
private long up_flow;
private long d_flow;
private long s_flow;
//在反序列化时，反射机制需要调用空参构造函数，所以显示定义了一个空参构造函数
public FlowBean(){}
//为了对象数据的初始化方便，加入一个带参的构造函数
public FlowBean(String phoneNB, long up_flow, long d_flow) {
this.phoneNB = phoneNB;
this.up_flow = up_flow;
this.d_flow = d_flow;
this.s_flow = up_flow + d_flow;
}
public String getPhoneNB() {
return phoneNB;
}
public void setPhoneNB(String phoneNB) {
this.phoneNB = phoneNB;
}
public long getUp_flow() {
return up_flow;
}
public void setUp_flow(long up_flow) {
this.up_flow = up_flow;
}
public long getD_flow() {
return d_flow;
}
public void setD_flow(long d_flow) {
this.d_flow = d_flow;
}
public long getS_flow() {
return s_flow;
}
public void setS_flow(long s_flow) {
this.s_flow = s_flow;
}
//将对象数据序列化到流中
public void write(DataOutput out) throws IOException {
out.writeUTF(phoneNB);
out.writeLong(up_flow);
out.writeLong(d_flow);
out.writeLong(s_flow);
}
//从数据流中反序列出对象的数据
//从数据流中读出对象字段时，必须跟序列化时的顺序保持一致
public void readFields(DataInput in) throws IOException {
phoneNB = in.readUTF();
up_flow = in.readLong();
d_flow = in.readLong();
s_flow = in.readLong();
}
@Override
public String toString() {
return "" + up_flow + "\t" +d_flow + "\t" + s_flow;
}
public int compareTo(FlowBean o) {
return s_flow>o.getS_flow()?-1:1;
}
}
package zhouls.bigdata.myMapReduce.areapartition;
import java.util.HashMap;
import org.apache.hadoop.mapreduce.Partitioner;
public> private static HashMap<String,Integer> areaMap = new HashMap<>();
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 numPartitions) {
//从key中拿到手机号，查询手机归属地字典，不同的省份返回不同的组号
int areaCoder= areaMap.get(key.toString().substring(0, 3))==null?5:areaMap.get(key.toString().substring(0, 3));
return areaCoder;
}
}
package zhouls.bigdata.myMapReduce.areapartition;
import java.io.IOException;
import org.apache.commons.lang.StringUtils;
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 org.apache.hadoop.util.Tool;
import org.apache.hadoop.util.ToolRunner;
import zhouls.bigdata.myMapReduce.areapartition.FlowBean;
/**
* 对流量原始日志进行流量统计，将不同省份的用户统计结果输出到不同文件
* 需要自定义改造两个机制：
* 1、改造分区的逻辑，自定义一个partitioner
* 2、自定义reduer task的并发任务数
*
*
*
*/
public>
public static> @Override
protected void map(LongWritable key, Text value,Context context)
throws IOException, InterruptedException {
//拿一行数据
String line = value.toString();
//切分成各个字段
String[] fields = StringUtils.split(line, "\t");
//拿到我们需要的字段
String phoneNB = fields;
long u_flow = Long.parseLong(fields);
long d_flow = Long.parseLong(fields);
//封装数据为kv并输出
context.write(new Text(phoneNB), new FlowBean(phoneNB,u_flow,d_flow));
}
}
public static> @Override
protected void reduce(Text key, Iterable<FlowBean> values,Context context)
throws IOException, InterruptedException {
long up_flow_counter = 0;
long d_flow_counter = 0;
for(FlowBean bean: values){
up_flow_counter += bean.getUp_flow();
d_flow_counter += bean.getD_flow();
}
context.write(key, new FlowBean(key.toString(), up_flow_counter, d_flow_counter));
}
}
public int run(String[] arg0) throws Exception{
Configuration conf = new Configuration();
Job job = Job.getInstance(conf);
job.setJarByClass(FlowSumArea.class);
job.setMapperClass(FlowSumAreaMapper.class);
job.setReducerClass(FlowSumAreaReducer.class);
//设置我们自定义的分组逻辑定义
job.setPartitionerClass(AreaPartitioner.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(FlowBean.class);
//设置reduce的任务并发数，应该跟分组的数量保持一致
job.setNumReduceTasks(1);
FileInputFormat.addInputPath(job, new Path(arg0));// 文件输入路径
FileOutputFormat.setOutputPath(job, new Path(arg0));// 文件输出路径
job.waitForCompletion(true);
return 0;
}
public static void main(String[] args) throws Exception {
//集群路径
// String[] args0 = { "hdfs://HadoopMaster:9000/flowSumArea/HTTP_20130313143750.dat",
// "hdfs://HadoopMaster:9000/out/flowSumArea"};
//集群路径
String[] args0 = { "./data/flowSumArea/HTTP_20130313143750.dat",
"./out/flowSumArea/"};
int ec = ToolRunner.run( new Configuration(), new FlowSumArea(), args0);
System. exit(ec);
}
@Override
public Configuration getConf() {
// TODO Auto-generated method stub
return null;
}
@Override
public void setConf(Configuration arg0) {
// TODO Auto-generated method stub
}
}
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