Thanks very much Aaron! 4. Not sure how Hector handles it, try https://github.com/zznate/cassandra-tutorial or https://github.com/zznate/hector-examples Let me ask question 4 again. :) 1. RandomPartitioner and OrderPreservingPartitioner response same result for get_range_slices API. Is the only difference is efficiency?2. Don't RF & CL influence get_range_slices API, do they? Best Reguards.Colin.