Hi, On 2018-08-01 12:45:27 -0400, Bruce Momjian wrote: > On Wed, Aug 1, 2018 at 09:39:43AM -0700, Andres Freund wrote: > > On 2018-08-01 12:36:13 -0400, Bruce Momjian wrote: > > > This patchset is weird because it is perhaps our first case of trying to > > > change the state of the server while it is running. We just don't have > > > an established protocol for how to orchestrate that, so we are limping > > > along toward a solution. > > > > There's a number of GUCs that do this? Even in related areas, > > cf. full_page_writes. > > How is that taking the server from one state to the next in a > non-instantaneous way?
Because it requires coordination around checkpoints, it can only really fully take effect after the start of a checkpoint. And it even both has primary and replica differences... Greetings, Andres Freund
