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From Dmitrii Dimandt <>
Subject Re: Questions about data modeling
Date Thu, 24 Jun 2010 15:19:33 GMT
Indeed. So simple it didn't even cross my mind :) Thank you!

On Thu, Jun 24, 2010 at 5:00 PM,  <> wrote:
> About the most popular item, you could probably store the k most popular
> items in a ColumnFamily with appropriate columns, and every time someone
> casts a vote, check whether they need updating/replacement.
> Alexander
>> I'm currently trying to wrap my head around Cassandra which is definitely
>> not easy for a mind deeply entrenched in SQL :)
>> I see how blogs/tweets etc. can be modeled in Cassandra. However, I have a
>> sightly different problem.
>> Let's say we let the user see a random
>> item(article/picture/recipe/you-name-it) and vote for it. We should show
>> the most popular items, the last articles/pictures the user has voted for
>> etc.
>> 1. How can I show the most popular items?
>> 2. How can I present the user with a random item he hasn't seen yet?
>> For the first question I figured I could have a <ColumnFamily
>> CompareWith="LongType"  Name="Rating"/> and store lists of items per each
>> rating, updating them as necessary. Can't figure out a way to correctly
>> implement question number 2.

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