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, ....}
}
or
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
entity.
Or is cassandra so fast that 50 key based calls is no reason to worry?
