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how to feed sample of data to each mapper - Hive - [mail # user]
...Assume there is one large data set with size 100G on hdfs, how can Icontrol that every data sent into each mapper is around 10G and the 10G israndom sampled from the 100G data set? Do we hav...
   Author: qiaoresearcher, 2014-02-27, 06:03
how to write hive query to solve this problem? - Hive - [mail # user]
...I have three tables:  Table 1: record when and who visited gas station or not, this contains all the users of interest, name all the users as a set A date         &n...
   Author: qiaoresearcher, 2013-08-30, 23:34
question about machine learning on Hive - Hive - [mail # user]
...How to run machine learning algorithms (whatever ML algorithms) directly in Hive? assume the input and output already stored as Hive tables.  ps: I know mahout is available there, but w...
   Author: qiaoresearcher, 2013-01-17, 21:23
hive regular expression - Hive - [mail # user]
...Assume there are strings like  'afewexcvgregre&MovieTitle=321grgrdg&olfll3onsl'  or  '?MovieTitle=949303sjkskld&sososodn'   how to extract 'MovieTitle=321grgrdg' or 'Movi...
   Author: qiaoresearcher, 2012-12-26, 18:46
how to transform the date format in hive? - Hive - [mail # user]
...Hi All,  Assume we have two time stamp like:    9/15/2002  8:05   and    9/15/2002 9:05  if we need to evaluate the difference of these two time stamp...
   Author: qiaoresearcher, 2012-11-21, 23:15
Re: how to obtain the latest record for each user in a hive table? - Hive - [mail # user]
...Hi Edward,  thanks for you reply.  right now my solution is: 1) 1st step, run:   select concat(user_id,max(visiting_time)) from table , then we have something like: user1-time...
   Author: qiaoresearcher, 2012-11-19, 23:30
need help on writing hive query - Hive - [mail # user]
...The table format is something like:  user_id    visiting_time      visiting_web_page user1          time11         ...
   Author: qiaoresearcher, 2012-11-03, 03:35
how to select a specific row from the table using hive, say, row 10, - Hive - [mail # user]
   Author: qiaoresearcher, 2012-10-04, 15:05
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