Re: [HACKERS] Quorum commit for multiple synchronous replication. - Mailing list pgsql-hackers

From Noah Misch
Subject Re: [HACKERS] Quorum commit for multiple synchronous replication.
Date
Msg-id 20170421030240.GB184144@rfd.leadboat.com
Whole thread Raw
In response to Re: [HACKERS] Quorum commit for multiple synchronous replication.  (Masahiko Sawada <sawada.mshk@gmail.com>)
Responses Re: [HACKERS] Quorum commit for multiple synchronous replication.  (Masahiko Sawada <sawada.mshk@gmail.com>)
List pgsql-hackers
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:
> >> On Sun, Apr 16, 2017 at 1:19 PM, Noah Misch <noah@leadboat.com> wrote:
> >> > On Fri, Apr 14, 2017 at 11:58:23PM -0400, Noah Misch wrote:
> >> >> On Wed, Apr 05, 2017 at 09:51:02PM -0400, Noah Misch wrote:
> >> >> > On Thu, Apr 06, 2017 at 12:48:56AM +0900, Fujii Masao wrote:
> >> >>
> >> >> > > > On Mon, Dec 19, 2016 at 09:49:58PM +0900, Fujii Masao wrote:
> >> >> > > >> (3)
> >> >> > > >> The priority value is assigned to each standby listed in s_s_names
> >> >> > > >> even in quorum commit though those priority values are not used at all.
> >> >> > > >> Users can see those priority values in pg_stat_replication.
> >> >> > > >> Isn't this confusing? If yes, it might be better to always assign 1 as
> >> >> > > >> the priority, for example.
> >
> >> >> This PostgreSQL 10 open item is past due for your status update.  Kindly send
> >> >> a status update within 24 hours, and include a date for your subsequent status
> >> >> update.  Refer to the policy on open item ownership:
> >> >> https://www.postgresql.org/message-id/20170404140717.GA2675809%40tornado.leadboat.com
> >
> >> >> > Since you do want (3) to change, please own it like any other open item,
> >> >> > including the mandatory status updates.
> >> >>
> >> >> Likewise.
> >>
> >> 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?



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