Hadoop基礎(二十九):資料清洗(ETL)(二)複雜解析版
阿新 • • 發佈:2020-07-19
資料清洗案例實操-複雜解析版
1.需求
對Web訪問日誌中的各欄位識別切分,去除日誌中不合法的記錄。根據清洗規則,輸出過濾後的資料。
(1)輸入資料
(2)期望輸出資料
都是合法的資料
2.實現程式碼
(1)定義一個bean,用來記錄日誌資料中的各資料欄位
package com.atguigu.mapreduce.log; public class LogBean { private String remote_addr;// 記錄客戶端的ip地址 private String remote_user;// 記錄客戶端使用者名稱稱,忽略屬性"-" privateView CodeString time_local;// 記錄訪問時間與時區 private String request;// 記錄請求的url與http協議 private String status;// 記錄請求狀態;成功是200 private String body_bytes_sent;// 記錄傳送給客戶端檔案主體內容大小 private String http_referer;// 用來記錄從那個頁面連結訪問過來的 private String http_user_agent;// 記錄客戶瀏覽器的相關資訊 private boolean valid = true;// 判斷資料是否合法public String getRemote_addr() { return remote_addr; } public void setRemote_addr(String remote_addr) { this.remote_addr = remote_addr; } public String getRemote_user() { return remote_user; } public void setRemote_user(String remote_user) {this.remote_user = remote_user; } public String getTime_local() { return time_local; } public void setTime_local(String time_local) { this.time_local = time_local; } public String getRequest() { return request; } public void setRequest(String request) { this.request = request; } public String getStatus() { return status; } public void setStatus(String status) { this.status = status; } public String getBody_bytes_sent() { return body_bytes_sent; } public void setBody_bytes_sent(String body_bytes_sent) { this.body_bytes_sent = body_bytes_sent; } public String getHttp_referer() { return http_referer; } public void setHttp_referer(String http_referer) { this.http_referer = http_referer; } public String getHttp_user_agent() { return http_user_agent; } public void setHttp_user_agent(String http_user_agent) { this.http_user_agent = http_user_agent; } public boolean isValid() { return valid; } public void setValid(boolean valid) { this.valid = valid; } @Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(this.valid); sb.append("\001").append(this.remote_addr); sb.append("\001").append(this.remote_user); sb.append("\001").append(this.time_local); sb.append("\001").append(this.request); sb.append("\001").append(this.status); sb.append("\001").append(this.body_bytes_sent); sb.append("\001").append(this.http_referer); sb.append("\001").append(this.http_user_agent); return sb.toString(); } }
(2)編寫LogMapper類
package com.atguigu.mapreduce.log; import java.io.IOException; import org.apache.hadoop.io.LongWritable; import org.apache.hadoop.io.NullWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.mapreduce.Mapper; public class LogMapper extends Mapper<LongWritable, Text, Text, NullWritable>{ Text k = new Text(); @Override protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException { // 1 獲取1行 String line = value.toString(); // 2 解析日誌是否合法 LogBean bean = parseLog(line); if (!bean.isValid()) { return; } k.set(bean.toString()); // 3 輸出 context.write(k, NullWritable.get()); } // 解析日誌 private LogBean parseLog(String line) { LogBean logBean = new LogBean(); // 1 擷取 String[] fields = line.split(" "); if (fields.length > 11) { // 2封裝資料 logBean.setRemote_addr(fields[0]); logBean.setRemote_user(fields[1]); logBean.setTime_local(fields[3].substring(1)); logBean.setRequest(fields[6]); logBean.setStatus(fields[8]); logBean.setBody_bytes_sent(fields[9]); logBean.setHttp_referer(fields[10]); if (fields.length > 12) { logBean.setHttp_user_agent(fields[11] + " "+ fields[12]); }else { logBean.setHttp_user_agent(fields[11]); } // 大於400,HTTP錯誤 if (Integer.parseInt(logBean.getStatus()) >= 400) { logBean.setValid(false); } }else { logBean.setValid(false); } return logBean; } }View Code
(3)編寫LogDriver類
package com.atguigu.mapreduce.log; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.NullWritable; 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 LogDriver { public static void main(String[] args) throws Exception { // 1 獲取job資訊 Configuration conf = new Configuration(); Job job = Job.getInstance(conf); // 2 載入jar包 job.setJarByClass(LogDriver.class); // 3 關聯map job.setMapperClass(LogMapper.class); // 4 設定最終輸出型別 job.setOutputKeyClass(Text.class); job.setOutputValueClass(NullWritable.class); // 5 設定輸入和輸出路徑 FileInputFormat.setInputPaths(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); // 6 提交 job.waitForCompletion(true); } }View Code