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From Ed Anuff ...@anuff.com>
Subject data model for unique users in a time period
Date Mon, 31 Oct 2011 17:22:31 GMT
I'm looking at the scenario of how to keep track of the number of
unique visitors within a given time period.  Inserting user ids into a
wide row would allow me to have a list of every user within the time
period that the row represented.  My experience in the past was that
using get_count on a row to get the column count got slow pretty quick
but that might still be the easiest way to get the count of unique
users with some sort of caching of the count so that it's not
expensive subsequently.  Using Hadoop is overkill for this scenario.
Any other approaches?

Ed

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