Hadoop import

[Mark]

This is more of a general design question but what is the preferred way 
of importing logs from Kafka to HDFS when you want your data segmented 
by hour or day? Is there anyway to say "Import only this {hour|day} of 
logs" or does one need to create their topics around the way they would 
like to import them.. ie Topic: "search_logs/2011/11/06". If its the 
latter, is there any documentation/best practices on topic/key design?

Thanks