使用Hive转换点击路径分析日志



我的点击日志是这样的:

        userID     time                    URL  
           1       2011-03-1 12:30:01      abc.com
           2       2011-03-1 12:30:04      xyz.com
           1       2011-03-1 12:30:46      abc.com/new
           2       2011-03-1 12:31:02      xyz.com/fun
           2       2011-03-1 12:36:08      xyz.com/funner
           1       2011-03-1 12:45:46      abc.com/newer

我想将其转换为按会话组织的点击路径数据(定义为自用户上次点击后10分钟间隔开始的任何一系列点击),因为我想运行点击路径分析。下面是预期的结果:

        userID     sessionStart           clicktime               Seconds       fromPage          toPage
          1        2011-03-1 12:30:01     2011-03-1 12:30:01      NULL          NULL              abc.com
          1        2011-03-1 12:30:01     2011-03-1 12:30:46      45            abc.com           abc.com/new
          1        2011-03-1 12:30:01     NULL                    NULL          abc.com/new       NULL
          1        2011-03-1 12:45:46     2011-03-1 12:45:46      NULL          NULL              abc.com/newer
          1        2011-03-1 12:45:46     NULL                    NULL          abc.com/newer     NULL
          2        2011-03-1 12:30:04     2011-03-1 12:30:04      NULL          NULL              xyz.com
          2        2011-03-1 12:30:04     2011-03-1 12:31:02      58            xyz.com           xyz.com/fun
          2        2011-03-1 12:30:04     2011-03-1 12:36:08      306           xyz.com/fun       xyz.com/funner
          2        2011-03-1 12:30:04     NULL                    NULL          xyz.com/funner    NULL

注意,用户1有两个不同的会话,因为第二次和第三次点击之间有10多分钟的间隔。

我以为我找到了一个解决方案,使用Hive的窗口功能从版本0.11,但我正在使用版本0.10,所以现在我卡住了。

我认为您可以使用Hive变换函数,使用自定义减速机脚本。您必须确保具有相同user_id的所有行都由相同的reducer处理,使用distribute by函数,并且使用sort by函数按升序发送行。

ADD FILE hdfs:///path/to/your/scripts/reducer_script.py ;
create table clickStream as 
select 
transform (a.user_id, a.time , a.url) 
USING 'reducer_sessionizer.py' as (user_id, time, url, fromPage, toPage)
from (select user_id, time, url from rawData distribute by user_id sort by time ) a ;

你的脚本,以python为例,将逐行读取你的数据集,你将根据键的变化处理数据:

sessionDuration = 10 minutes
for line_out in sys.stdin:
    str = []
    line_split = line_out.strip().split('t')
# line_split = [userId, Time, Url]

# check the duration since last action, if above the sessionDuration, we create a new session Id
# check the user (the key) is still the same too, else, we create a new session Id
# we store the userId to compare on next iteration
    if (line_split[1] - prev_time > sessionDuration OR prev_user != line_split[0]) :
        sid = uuid.uuid4().hex
        prev_url = "Null"
        sess_start = line_split[1]
    else :
        pass
    str.append(line_split[0]) # userId
    str.append('t')
    str.append(line_split[2]) # toPage
    str.append('t')
    str.append(sess_start) # session start time
    str.append('t')
    str.append(prev_url) # fromPage
    print "".join(str)
# for next iteration, we keep the previous userId, url and time
    prev_user = line_split[0]
    prev_time = line_split[1]
    prev_url = line_split[2]

(我不是真正的开发人员,所以将其视为伪代码,我让您添加日期处理)

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