Does anyone have a simple app schema they can share? I can't share the one for our main app. But we do need an example here. A real one would be nice if we can find one.
I checked App Engine. They don't have a whole lot of examples either. They do have a really simple one: http://code.google.com/appengine/docs/python/gettingstarted/usingdatastore.html The most important thing in Cassandra modeling is choosing a good key, since that is what most of your lookups will be by. Keys are also how Cassandra scales -- Cassandra can handle effectively infinite keys (given enough nodes obviously) but only thousands to millions of columns per key/CF (depending on what API calls you use -- Jun is adding one now that does not deseriailze everything in the whole CF into memory. The rest will need to follow this model eventually too). For this guestbook I think the choice is obvious: use the name as the key, and have a single simple CF for the messages. Each column will be a message (you can even use the mandatory timestamp field as part of your user-visible data. win!). You get the list (or page) of users with get_key_range and then their messages with get_slice. <ColumnFamily ColumnSort="Name" Name="Message"/> Anyone got another one for pedagogical purposes? -Jonathan
