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Re: Error code for "terminating connection due to conflict with recovery"

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Bruce Momjian <bruce(at)momjian(dot)us>, fgp(at)phlo(dot)org, Tatsuo Ishii <ishii(at)postgresql(dot)org>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Error code for "terminating connection due to conflict with recovery"
Date: 2011-02-01 08:17:55
Message-ID: 1296548275.1779.8060.camel@ebony (view raw or flat)
Thread:
Lists: pgsql-hackers
On Mon, 2011-01-31 at 20:52 -0500, Tom Lane wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> > On Mon, Jan 31, 2011 at 7:25 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> >> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> >>> Seems a little weird to me, since the administrator hasn't done
> >>> anything.
> 
> >> Sure he has: he issued the DROP DATABASE command that's causing the
> >> system to disconnect standby sessions.
> 
> > Well, I'm not sure how much this matters - as long as it's a dedicated
> > error code, the user can write code to DTRT somehow.  But I don't buy
> > your argument.  Ultimately, user activity causes any kind of recovery
> > conflict.
> 
> Well, yeah, but the predictability of the failure is pretty variable.
> In this case we can say that the error definitely would not have
> occurred if somebody hadn't done a DROP DATABASE on the master while
> there were live sessions in that DB on the slave.  I think that's a
> sufficiently close coupling to say that the error is the result of an
> operator action.  OTOH, the occurrence of deadlocks is (usually) a lot
> more dependent on random-chance timing of different transactions, and
> you usually can't point to any action that intentionally caused a
> deadlock.

ERRCODE_DATABASE_DROPPED    57P04   looks best

The previous code was 57P01 so this is least change, if nothing else.

-- 
 Simon Riggs           http://www.2ndQuadrant.com/books/
 PostgreSQL Development, 24x7 Support, Training and Services
 


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