Large scale Apache log file analysis

Does anyone know of any good commercial products to analyze about 500 million to 1 billion rows (1 week) of apache access logs?

Looking for fairly simple analysis. Something similar to what weblog expert does, but on a larger scale.

Are there any commercial tools out to do this or are we stuck writing something for this?

I know we could use hive/hadoop/cassandra etc and build something. We are about to roll out another product that uses cassandra as a backend, but this is simply to get an idea of some of our basic web stats in a simple report. This is not part of our core product, so I am just looking to see if there is an easy way to do something here without a bunch of development.