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From S Ahmed <>
Subject CF that is like a non-clustered index, are key lookups that fast?
Date Tue, 15 Jun 2010 09:29:00 GMT
If you store only the key mappings in a column family, for custom ordering
of rows etc. for things like:

friends = {

   user_id : { friendid1, friendid2, ....}



topForumPosts = {

    forum_id1 : { post2343, post32343, post32223, ...}


Now on friends page or on the top_forum_posts page you will get back a list
of post_ids, you will then have to perform lookups on the main 'posts' CF to
get the actual data.  So if a page is displaying 10, 25, or 50 posts you
will have 10, 25 or 50 key based lookups for each page view.

Is this the suggested way?  i.e. a look based on a slice to get a list of
post_id's, then a seperate call to actually fetch the data for the given

Or is cassandra so fast that 50 key based calls is no reason to worry?

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