How do you make this calculation? Thanks, *Tamar Fraenkel * Senior Software Engineer, TOK Media
[image: Inline image 1] ta...@tok-media.com Tel: +972 2 6409736 Mob: +972 54 8356490 Fax: +972 2 5612956 On Mon, Jul 30, 2012 at 3:14 PM, Tim Wintle <timwin...@gmail.com> wrote: > 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 > > > > > > > > >
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