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From "cbertu81@libero.it" <cbert...@libero.it>
Subject Refactoring old project
Date Fri, 27 Sep 2013 13:24:19 GMT
Hi all, in my very old Cassandra schema (started with 0.6 -- so without 
secondary indexes -- and now on 1.0.6) I have a rating&review platform with 
about 1 million review. The core of the application is the review that a user 
can leave about a company. At the time I created many CF: Comments, 
UserComments, CompanyComments , CityComments -- and I used timeuuid to keep 
data sorted in the way i needed (UserComments/CompanyComments/CityComments did 
not keep real comments but just a "referece" [id] to the comment table)

Since I need comments to be sorted by date, what would be the best way to 
write it again using cassandra 2.0?
Obviously all these CF will merge into one. What I would need is to perform 
query likes ...

Get latest X comments in a specific city
Get latest X comments of a company
Get latest X comments of a user

I can't sort client side because, even if for user/company I can have up to 
200 reviews, for a city I can have 50.000 and more comments.
I know that murmur3 is the suggested one but I wonder if this is not the case 
to use the Order Preserving.

A row entry would be something like

CommentID (RowKey) -- companyId -- userId -- text - vote - city

Another idea is to use a composite key made by (city, commentid) so I would 
have all comments sorted by city for free and could perform client-side sorting 
for user/company comments. Am I missing something? 

TIA,
Carlo



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