MapReduce 收集日志 分析访问量，点击流

61.235.163.33 - - [12/Jul/2017:00:00:59 +0800] "GET /good?shopId=4&goodId=10 HTTP/1.1" 200 450 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36" "-"
36.56.133.27 - - [12/Jul/2017:00:03:02 +0800] "GET /good?shopId=1&goodId=2 HTTP/1.1" 200 450 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36" "-"
106.83.184.240 - - [12/Jul/2017:00:03:50 +0800] "GET /good?shopId=5&goodId=10 HTTP/1.1" 200 450 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36" "-"
36.63.247.51 - - [12/Jul/2017:00:04:16 +0800] "GET /search?value=小茴香 HTTP/1.1" 200 450 "-" "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36" "-"

日志格式如上：

获取日志内容，分割获取Key - value：

protected void map(LongWritable key, Text value, Context context) throws IOException, InterruptedException {
    String[] lines = value.toString().split(" ");
    String ip = lines[0];
    String time = lines[3] + " " + lines[4];
    String url = lines[6];
    outputKey.setIp(ip);
    outputKey.setTime(time);
    outputValue.set(url);
    context.write(outputKey, outputValue);

}

自定义排序规则：

首先以Ip为Key 进行排序，Ip相同时以Time 进行排序，时间格式转化使用SimpleDateFormat （在Hadoop中，如果用FastDateFormat 会有冲突）

public static class IpTimeKey implements WritableComparable {
    private String ip;
    private String time;

    public String getIp() {
        return ip;
    }

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

    public String getTime() {
        return time;
    }

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

    @Override
    public int compareTo(IpTimeKey o) {
        int ipCompareResult = ip.compareTo(o.getIp());
        if (ipCompareResult == 0) {
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("[dd/MMM/yyyy:HH:mm:ss Z]", Locale.ENGLISH);
            try {
                if (simpleDateFormat.parse(o.getTime()).getTime() - simpleDateFormat.parse(time).getTime() > 0) {
                    return -1;
                } else {
                    return 1;
                }
            } catch (ParseException e) {
                e.printStackTrace();
            }

        } else {
            return ipCompareResult;
        }
        return 0;
    }

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

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

    }
}

自定义聚合规则：

以Ip为Key 进行聚合

public static class ClickingGropingComparator extends WritableComparator {
    public ClickingGropingComparator() {
        super(IpTimeKey.class, true);
    }

    @Override
    public int compare(WritableComparable a, WritableComparable b) {
        IpTimeKey k1 = (IpTimeKey) a;
        IpTimeKey k2 = (IpTimeKey) b;
        return k1.getIp().compareTo(k2.getIp());
    }
}

最后 Reduce 同一Ip等待时间超过30m，或者Ip不同看作不同的人登录，用不同的session代表，输出Ip session time Url  单页面访问时长  步长（每个session进行了多少步操作）

public static class ClickingReduce extends Reducer {
    private Text outputKey = new Text();
    String time = null;
    String lastIp = "0";
    String session = UUID.randomUUID().toString();
    SimpleDateFormat inputTime = new SimpleDateFormat("[dd/MMM/yyyy:HH:mm:ss Z]", Locale.ENGLISH);
    SimpleDateFormat outputTime = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    @Override
    protected void reduce(IpTimeKey key, Iterable values, Context context) throws IOException, InterruptedException {
        Integer by = 0;
        Long stayTime = 0L;
        String lastValue = null;
        String last = null;
        for (Text value : values) {
            if (last != null) {
                try {
                    time = outputTime.format(inputTime.parse(last));
                } catch (ParseException e) {
                    e.printStackTrace();
                }
                try {
                    stayTime = inputTime.parse(key.getTime()).getTime() - inputTime.parse(last).getTime();
                } catch (ParseException e) {
                    e.printStackTrace();
                }
                if (stayTime < 1800000) {
                    outputKey.set(key.getIp() + " " + session + " " + time + " " + lastValue + " "
                            + stayTime + " " + by);
                    by = by + 1;
                } else {
                    outputKey.set(key.getIp() + " " + session + " " + time + " " + lastValue + " " + 0 + " " + by);
                    session = UUID.randomUUID().toString();
                    by = 0;
                }
                context.write(outputKey, NullWritable.get());
            }
            last = key.getTime();
            lastValue = value.toString();
        }
        try {
            outputKey.set(key.getIp() + " " + session + " " + outputTime.format(inputTime.parse(last)) + " " + lastValue + " "
                    + 0 + " " + by);
        } catch (ParseException e) {
            e.printStackTrace();
        }
        context.write(outputKey, NullWritable.get());
    }
}

最后在Main函数输出，就OK啦！~

在定义LastValue时，我开始定义成Text类型了，输出结果时发现 value == LastValue ，坑死了，虽然Hadoop中Text 与 String 看似相同，但是在存储格式和访问方式上是有区别的，如果是Text型，当 LastValue = value 是，循环中是得不到想要的上一个value的，因为Text的访问方式决定的。