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From Ryan King <>
Subject Re: Visual representation of Cassandra data model
Date Thu, 13 Aug 2009 00:35:56 GMT
A few quick comments:

* its not clear what column family the super column you're using is in.
* it might be useful to include the timestamps in the columns (since
they're user-supplied)
* given that the colon-delimited api has been removed, it might be
easier to explain the data model without such strings
* why would you mix different kinds of data in the same column family,
rather than having separate column families for each? (users,
bookmarks, tags)


On Wed, Aug 12, 2009 at 4:57 PM, Mark McBride<> wrote:
> While working on an updated data model wiki page I'm trying to put
> together a graphical representation of the data model.  I threw this
> together based on Curt's goal of modeling delicious.  The basic gist
> is descriptive data for tags, users, and bookmarks goes in the
> Description column family.  The relationships between bookmarks, tags
> and users goes in the map supercolumn.  I'm not sure this is how you
> would do it in production (I'm guessing at the very least you'd want
> separate supercolumns for bookmarks, tags and users), but it seems to
> be simple enough for a new user to digest, and covers all the bases of
> the data model (aside from ordering I guess).  So two questions
> 1) did I get it right (I'm new to this as well)?
> 2) is this a useful representation?
>  ---Mark

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