使用mapreduce来分析网站的log日志

近日，有人和我说分析log日志。

之前，就写过，但是忘了总结了，找了半天也没有找到，看了以后要将东西整理了。

无奈，在网上收拾，看到这个人写的，索性，就搬过来，待我找到我写的，在一块补充一下！

所有网站的服务器上都会保留访问的log日志。这些log日志记录的其他机器访问服务器的ip，时间，http协议，状态码等信息。

比如这样：


 
image.png

大型网站的服务器往往会产生海量的log日志，用hadoop来分析log日志，也是一个很好的练手的机会。

下面写一个例子，通过分析服务器的log日志，统计访问服务器的ip地址和访问的次数。

map函数
public class worldcount extends Mapper<LongWritable,Text,Text,IntWritable>{
    //重载Mapper类的map方法
    // 这里的key是读取文件的行号，value是对应行号的文本
    protected void map(LongWritable key,Text value,Context context) throws IOException, InterruptedException{
        //将这一行转化为string
        String line=value.toString();
        //以空格切分
        String [] linewords = line.split(" ");
        //获得ip
        String ip=linewords[0];
        
        // 所以在context里面写的内容就是 key：ip ，value 是1
        context.write(new Text(ip), new IntWritable(1));
    }
}

<br />

reduce 函数
public class worldcountreduce extends  Reducer <Text,IntWritable,Text,IntWritable> {
    // 一组相同的key，调用一次reduce
    //相当于调用一次 ，计算一个key对应的个数
    protected void reduce (Text key,Iterable<IntWritable> values,Context context) throws IOException, InterruptedException{
        //统计单词数
        int count=0;
        for(IntWritable value :values){
            count=count+value.get();
        }   
        //将输出的结果放到context 里面
        context.write(key,new IntWritable(count));
    }
}

<br />

Main 函数
public class jobclient {
    public static void main(String []args) throws IOException, ReflectiveOperationException, InterruptedException{
        Configuration conf=new Configuration();
        //conf.set("yarn.resoucemanager.hostname", value);  
        Job job=Job.getInstance(conf);
        //job.setJar("~/code/WordCount.jar");
        //告知客户端的提交器 mr程序所在的jar包
        //这样就不必使用setjar 这样的方法了
        job.setJarByClass(jobclient.class);
        // 告知mrapp master ，map 和reduce 对应的实现类
        job.setMapperClass(worldcount.class);
        job.setReducerClass(worldcountreduce.class);
        //告知输入，和输出的数据结构的类型
        job.setMapOutputKeyClass(Text.class);
        job.setMapOutputValueClass(IntWritable.class);
        
        job.setOutputKeyClass(Text.class);
        job.setOutputValueClass(IntWritable.class);
        
        //告知mrappmaster 我们启动的reduce tash的数量
        //启动maptask 的数量 是yarn 会自动的计算
        job.setNumReduceTasks(3);
        
        //指定一个目录而不是文件
        FileInputFormat.setInputPaths(job, new Path("hdfs://localhost:9000/kpi/"));
        FileOutputFormat.setOutputPath(job,new Path("hdfs://localhost:9000/kpi/output/"));
        // job.submit()
        //这个要比job.submit 要好，因为这个client并不会在提交任务之后，就退出，而是创建一个线程去监控 map和reduce的运行
        boolean res=job.waitForCompletion(true);
        // 执行成功 状态吗 是0，执行失败 状态码是100
        // 通过echo $? 显示状态码
        System.out.println("wakakka ");
        System.exit(res?0:100);
    }
}

这里的输入是一个目录，可以把输入的文件放到这个目录里面就好。比如这里，我把access.log.10文件放在kpi目录下面。


 
2017-03-24 22-56-13屏幕截图.png

然后将代码打包为一个jar包，使用hadoo命令执行这个jar包。（执行这条命令必须在jar包所在的目录下面执行）


 
2017-03-24 22-57-33屏幕截图.png

程序运行的结果是在输出的目录里面：

 
2017-03-25 09-38-29屏幕截图.png

查看一个文件，就是程序的运行结果：

 
2017-03-25 09-41-36屏幕截图.png

关于代码的一些小结：

  1. hadoop经常启动失败，或者出现访问失败的情况。
  2. 在写代码之前，一定要把所有的关于hadoop，mapreduce的包导入。
  3. 将代码打包为一个jar包。

github地址：
https://github.com/zhaozhengcoder/hadoop/tree/master/mapreduce_kpi



作者：sexycoder
链接：https://www.jianshu.com/p/f0b7e273539d

 
 
 
 
 
放一段事例，待用:
  
194.237.142.21 - - [18/Sep/2013:06:49:18 +0000] "GET /wp-content/uploads/2013/07/rstudio-git3.png HTTP/1.1" 304 0 "-" "Mozilla/4.0 (compatible;)"
183.49.46.228 - - [18/Sep/2013:06:49:23 +0000] "-" 400 0 "-" "-"
163.177.71.12 - - [18/Sep/2013:06:49:33 +0000] "HEAD / HTTP/1.1" 200 20 "-" "DNSPod-Monitor/1.0"
163.177.71.12 - - [18/Sep/2013:06:49:36 +0000] "HEAD / HTTP/1.1" 200 20 "-" "DNSPod-Monitor/1.0"
101.226.68.137 - - [18/Sep/2013:06:49:42 +0000] "HEAD / HTTP/1.1" 200 20 "-" "DNSPod-Monitor/1.0"
101.226.68.137 - - [18/Sep/2013:06:49:45 +0000] "HEAD / HTTP/1.1" 200 20 "-" "DNSPod-Monitor/1.0"
60.208.6.156 - - [18/Sep/2013:06:49:48 +0000] "GET /wp-content/uploads/2013/07/rcassandra.png HTTP/1.0" 200 185524 "http://cos.name/category/software/packages/" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36"
222.68.172.190 - - [18/Sep/2013:06:49:57 +0000] "GET /images/my.jpg HTTP/1.1" 200 19939 "http://www.angularjs.cn/A00n" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36"
222.68.172.190 - - [18/Sep/2013:06:50:08 +0000] "-" 400 0 "-" "-"
183.195.232.138 - - [18/Sep/2013:06:50:16 +0000] "HEAD / HTTP/1.1" 200 20 "-" "DNSPod-Monitor/1.0"
183.195.232.138 - - [18/Sep/2013:06:50:16 +0000] "HEAD / HTTP/1.1" 200 20 "-" "DNSPod-Monitor/1.0"
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221.130.41.168 - - [18/Sep/2013:06:50:37 +0000] "GET /feed/ HTTP/1.1" 304 0 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/29.0.1547.66 Safari/537.36"
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50.116.27.194 - - [18/Sep/2013:06:51:35 +0000] "POST /wp-cron.php?doing_wp_cron=1379487095.2510800361633300781250 HTTP/1.0" 200 0 "-" "WordPress/3.6; http://blog.fens.me"
58.215.204.118 - - [18/Sep/2013:06:51:35 +0000] "GET /nodejs-socketio-chat/ HTTP/1.1" 200 10818 "http://www.google.com/url?sa=t&rct=j&q=nodejs%20%E5%BC%82%E6%AD%A5%E5%B9%BF%E6%92%AD&source=web&cd=1&cad=rja&ved=0CCgQFjAA&url=%68%74%74%70%3a%2f%2f%62%6c%6f%67%2e%66%65%6e%73%2e%6d%65%2f%6e%6f%64%65%6a%73%2d%73%6f%63%6b%65%74%69%6f%2d%63%68%61%74%2f&ei=rko5UrylAefOiAe7_IGQBw&usg=AFQjCNG6YWoZsJ_bSj8kTnMHcH51hYQkAA&bvm=bv.52288139,d.aGc" "Mozilla/5.0 (Windows NT 5.1; rv:23.0) Gecko/20100101 Firefox/23.0"
58.215.204.118 - - [18/Sep/2013:06:51:36 +0000] "GET /wp-includes/js/jquery/jquery-migrate.min.js?ver=1.2.1 HTTP/1.1" 304 0 "http://blog.fens.me/nodejs-socketio-chat/" "Mozilla/5.0 (Windows NT 5.1; rv:23.0) Gecko/20100101 Firefox/23.0"
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58.215.204.118 - - [18/Sep/2013:06:51:36 +0000] "GET /wp-includes/js/comment-reply.min.js?ver=3.6 HTTP/1.1" 304 0 "http://blog.fens.me/nodejs-socketio-chat/" "Mozilla/5.0 (Windows NT 5.1; rv:23.0) Gecko/20100101 Firefox/23.0"
58.215.204.118 - - [18/Sep/2013:06:51:36 +0000] "GET /wp-content/uploads/2013/08/chat.png HTTP/1.1" 200 48968 "http://blog.fens.me/nodejs-socketio-chat/" "Mozilla/5.0 (Windows NT 5.1; rv:23.0) Gecko/20100101 Firefox/23.0"
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58.215.204.118 - - [18/Sep/2013:06:51:37 +0000] "GET /wp-content/uploads/2013/08/socketio.png HTTP/1.1" 200 80493 "http://blog.fens.me/nodejs-socketio-chat/" "Mozilla/5.0 (Windows NT 5.1; rv:23.0) Gecko/20100101 Firefox/23.0"
58.248.178.212 - - [18/Sep/2013:06:51:37 +0000] "GET /nodejs-grunt-intro/ HTTP/1.1" 200 51770 "http://blog.fens.me/series-nodejs/" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MDDR; InfoPath.2; .NET4.0C)"
58.248.178.212 - - [18/Sep/2013:06:51:40 +0000] "GET /wp-includes/js/jquery/jquery-migrate.min.js?ver=1.2.1 HTTP/1.1" 200 7200 "http://blog.fens.me/nodejs-grunt-intro/" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MDDR; InfoPath.2; .NET4.0C)"
58.248.178.212 - - [18/Sep/2013:06:51:40 +0000] "GET /wp-includes/js/comment-reply.min.js?ver=3.6 HTTP/1.1" 200 786 "http://blog.fens.me/nodejs-grunt-intro/" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MDDR; InfoPath.2; .NET4.0C)"
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58.248.178.212 - - [18/Sep/2013:06:51:40 +0000] "GET /wp-includes/js/jquery/jquery.js?ver=1.10.2 HTTP/1.1" 200 93128 "http://blog.fens.me/nodejs-grunt-intro/" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MDDR; InfoPath.2; .NET4.0C)"
58.248.178.212 - - [18/Sep/2013:06:51:40 +0000] "GET /wp-includes/js/comment-reply.min.js?ver=3.6 HTTP/1.1" 200 786 "http://blog.fens.me/nodejs-grunt-intro/" "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.1; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; MDDR; InfoPath.2; .NET4.0C)"
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原文地址：https://www.cnblogs.com/nucdy/p/8677650.html