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From Jonathan Ellis <>
Subject Re: How to answer queries of form "Give me the top 10 messages"
Date Fri, 10 Jul 2009 21:45:27 GMT
Have you read this?

On Fri, Jul 10, 2009 at 4:43 PM, <> wrote:
> Hey guys
> how do we answer queries of type - give me the top 10 messages
> or top 10 users and so on
> thanks
> Example: SuperColumns for Search Apps
> You can think of each supercolumn name as a term and the columns within as
> the docids with rank info and other attributes being a part of it. If you
> have keys as the userids then you can have a per-user index stored in this
> form. This is how the per user index for term search is laid out for Inbox
> search at Facebook. Furthermore since one has the option of storing data on
> disk sorted by "Time" it is very easy for the system to answer queries of
> the form "Give me the top 10 messages". For a pictorial explanation please
> refer to the Cassandra powerpoint slides presented at SIGMOD 2008.

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