On Mon, 2012-07-30 at 14:40 +0300, Tamar Fraenkel wrote: > Hi! > To clarify it a bit more, > Let's assume the setup is changed to > RF=3 > W_CL=QUORUM (or two for that matter) > R_CL=ONE
> The setup will now work for both read and write in case of one node > failure. > What are the disadvantages, other than the disk space needed to > replicate everything trice instead of twice? Will it affect also > performance? (I'm also running RF2, W_CL1, R_CL1 atm - so this is theoretical) As I understand it, the most significant performance hit will be to the variation in response time. For example with R_CL1, (roughly) 1% of requests will be take more than the worst 10% of server response times. With R_CL=QUORUM 2.8% of requests will have the same latency. (assuming I've just calculated that right) Tim > >
