On Wed, Feb 2, 2011 at 3:27 PM, Aditya Narayan <adynnn@gmail.com> wrote:
Can I have some more feedback about my schema perhaps somewhat more
criticisive/harsh ?

It sounds reasonable to me.

Since you're writing/reading all of the subcolumns at the same time, I would opt for a standard column with the tags serialized into a column value.

I don't think you need to worry about row lengths here.

Depending on the reminder size and how many times it's likely to be repeated in the timeline, you could explore denormalizing a bit more by storing the reminders in the timelines themselves, perhaps with a separate row per (user, tag) combination.  This would cut down on your seeks quite a bit, but it may not be necessary at this point (or at all).

Tyler Hobbs
Software Engineer, DataStax
Maintainer of the pycassa Cassandra Python client library