On Sat, Jun 29, 2019 at 5:49 AM Jeff Jirsa <[email protected]> wrote: > If you’re at RF= 3 and read/write at quorum, you’ll have full visibility > of all data if you switch to RF=4 and continue reading at quorum because > quorum if 4 is 3, so you’re guaranteed to overlap with at least one of the > two nodes that got all earlier writes > > Going from 3 to 4 to 5 requires a repair after 4. >
Understood, thanks for detailing it. At the same time, is it ever practical to use RF > 3? Is it practical to switch to 5 if you already have 3? I imagine this question is popping up more often in a context of switching from RF < 3 to =3. As well as switching from non-NTS to NTS, in which case it is indeed quite troublesome, as you have pointed out. -- Alex
