使用MapReduce对日志数据进行简单的清理和总结

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使用MapReduce对日志数据进行简单的清理和总结

首先使用MapReduce对日志进行分割，将time，ip，url提取出来，在用reduce进行一个整合，根据ip地址的出现次数，打印到hdfs中。在整合中我使用了bean结构来存储数据，bean继承了WritableComparable接口。

使用时先将BaiduLog和LogBean两个类导入项目，并配置相应的Maven依赖，然后导出项目的jar到虚拟机中，将日志文件上传到HDFS中，使用命令运行

hadoop jar rain-hadoop-1.0-SNAPSHOT.jar com.rain.mapreduce.BaiduLog /data/baidu.log /data/log/clean5

BaiduLog.java

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
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 java.io.IOException;

public class BaiduLog {
    public static class BaiduLogMapper extends Mapper<LongWritable,Text, Text, LogBean> {
        @Override
        protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
//            super.map(key, value, context);
            String log = value.toString();
            String str = "(cn.baidu.core.inteceptor.LogInteceptor:55)";
            if (log.indexOf(str)!=-1){
                String[] log_arr = log.split(str);
                String time = log_arr[0].substring(1, 10);
                String[] log_arr2 = log_arr[1].split("\t");
                String ip = log_arr2[1];
                String url = log_arr2[2];
                if (url.equals("null")){
                    url = log_arr2[3];
                }
                LogBean logbean = new LogBean(time,ip,url);
                context.write(new Text(ip),logbean);
            }
        }
    }
    public static class BaiduLogReducer extends Reducer<Text,LogBean,IntWritable,Text>{

        @Override
        protected void reduce(Text key, Iterable<LogBean> values, Context context) throws IOException, InterruptedException {
//            super.reduce(key, values, context);
            int sum = 0;

            StringBuffer str = new StringBuffer();
            int flag = 0;
            for (LogBean logbean:values){
                sum++;
                if (flag==0){
                    str.append(logbean.toString());
                    flag = 1;
                }
            }
            context.write(new IntWritable(sum),new Text(str.toString()));

        }
    }
    public static void main(String[] args) throws Exception {
        Configuration conf = new Configuration();
        Job job = Job.getInstance(conf, "avg");

        job.setJarByClass(BaiduLog.class);
        job.setMapperClass(BaiduLog.BaiduLogMapper.class);
        job.setReducerClass(BaiduLog.BaiduLogReducer.class);

//        job.setCombinerClass(BaiduLog.BaiduLogReducer.class);

        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(LogBean.class);

        FileInputFormat.addInputPath(job,new Path(args[0]));
        FileOutputFormat.setOutputPath(job,new Path(args[1]));
        System.exit(job.waitForCompletion(true)?0:1);
    }

}

LogBean.java

import org.apache.hadoop.io.Writable;
import org.apache.hadoop.io.WritableComparable;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;

public class LogBean implements WritableComparable<LogBean> {
    private String time;
    private String ip;
    private String url;

    public LogBean() {
        super();
    }

    public LogBean(String time, String ip, String url) {
        this.time = time;
        this.ip = ip;
        this.url = url;
    }

    @Override
    public String toString() {
        return "LogBean{" +
                "time='" + time + ' ' +
                ", ip='" + ip + ' ' +
                ", url='" + url + ' ' +
                '}';
    }

    public String getTime() {
        return time;
    }

    public void setTime(String time) {
        this.time = time;
    }

    public String getIp() {
        return ip;
    }

    public void setIp(String ip) {
        this.ip = ip;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }


    @Override
    public int compareTo(LogBean o) {
        return 0;
    }

    @Override
    public void write(DataOutput out) throws IOException {
        out.writeUTF(time);
        out.writeUTF(ip);
        out.writeUTF(url);

    }

    @Override
    public void readFields(DataInput in) throws IOException {
        time = in.readUTF();
        ip = in.readUTF();
        url = in.readUTF();
    }
}