hi Claudio,
thanks for the hint

the point is, that we need a fast request to the user data, that is why we need 
the row key to be the user_id



----- Original Message -----
From: Claudio Martella <claudio.marte...@tis.bz.it>
Sent: Fri Jul 15 2011 14:40:38 GMT+0200 (CET)
To:
CC:
Subject: Re: data structure

supposed you want a per-hour granularity, you could have a key like this

<userID>_<YYMMDDHH>

where

HH: hour of the day (0-23)
DD: day of the month
MM: month of the year
YY: year


this could be one way.



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