Re: Quorum commit for multiple synchronous replication.

On Thu, Apr 20, 2017 at 11:34:34PM -0700, Noah Misch wrote:
> On Fri, Apr 21, 2017 at 01:20:05PM +0900, Masahiko Sawada wrote:
> > On Fri, Apr 21, 2017 at 12:02 PM, Noah Misch <noah@leadboat.com> wrote:
> > > On Wed, Apr 19, 2017 at 01:52:53PM +0900, Masahiko Sawada wrote:
> > >> On Wed, Apr 19, 2017 at 12:34 PM, Noah Misch <noah@leadboat.com> wrote:
> > >> > On Sun, Apr 16, 2017 at 07:25:28PM +0900, Fujii Masao wrote:
> > >> >> As I told firstly this is not a bug. There are some proposals for better design
> > >> >> of priority column in pg_stat_replication, but we've not reached the consensus
> > >> >> yet. So I think that it's better to move this open item to "Design Decisions to
> > >> >> Recheck Mid-Beta" section so that we can hear more opinions.
> > >> >
> > >> > I'm reading that some people want to report NULL priority, some people want to
> > >> > report a constant 1 priority, and nobody wants the current behavior.  Is that
> > >> > an accurate summary?
> > >>
> > >> Yes, I think that's correct.
> > >
> > > Okay, but ...
> > >
> > >> FWIW the reason of current behavior is that it would be useful for the
> > >> user who is willing to switch from ANY to FIRST. They can know which
> > >> standbys will become sync or potential.
> > >
> > > ... does this mean you personally want to keep the current behavior?  If not,
> > > has some other person stated a wish to keep the current behavior?
> > 
> > No, I want to change the current behavior. IMO it's better to set
> > priority 1 to all standbys in quorum set. I guess there is no longer
> > person who supports the current behavior.
> 
> In that case, this open item is not eligible for section "Design Decisions to
> Recheck Mid-Beta".  That section is for items where we'll probably change
> nothing, but we plan to recheck later just in case.  Here, we expect to change
> the behavior; the open question is which replacement behavior to prefer.
> 
> Fujii, as the owner of this open item, you are responsible for moderating the
> debate until there's adequate consensus to make a particular change or to keep
> the current behavior after all.  Please proceed to do that.  Beta testers
> deserve a UI they may like, not a UI you already plan to change later.

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[1] https://www.postgresql.org/message-id/20170404140717.GA2675809%40tornado.leadboat.com