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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-hackers@lists.postgresql.org, Noah Misch <noah@leadboat.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: David Rowley <dgrowleyml@gmail.com>
Subject: Re: Intermittent buildfarm failures on wrasse
Date: Fri, 15 Apr 2022 17:51:26 -0400
Message-ID: <1802041.1650059486@sss.pgh.pa.us> (raw)
In-Reply-To: <B8178489-4414-4E0E-A74D-02267D4E9842@anarazel.de>
References: <CAH2-WznXXkkfE_y9ieaHkEQj31HeMAqJBtJPmDY+EpyVg1QywQ@mail.gmail.com>
	<1570894.1649986347@sss.pgh.pa.us>
	<20220415015249.kfsqxujrf2bn2wz6@alap3.anarazel.de>
	<20220415024515.GA862547@rfd.leadboat.com>
	<20220415051205.6abhlilh6fnjgohr@alap3.anarazel.de>
	<20220415052125.GD862547@rfd.leadboat.com>
	<1637671.1650032132@sss.pgh.pa.us>
	<1643686.1650036220@sss.pgh.pa.us>
	<A11045E8-18D2-4BBB-8CF1-80DC6920ED73@anarazel.de>
	<1650516.1650040612@sss.pgh.pa.us>
	<20220415165850.rh7byj7ep5jmzuzb@alap3.anarazel.de>
	<1737834.1650046487@sss.pgh.pa.us>
	<B8178489-4414-4E0E-A74D-02267D4E9842@anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> On April 15, 2022 2:14:47 PM EDT, Tom Lane <tgl@sss.pgh.pa.us> wrote:
>> I could use some help filling in the XXX comments, because it's far
>> from clear to me *why* walsenders need this to happen.

> If you want to  commit before: The reason is that walsenders use their xmin to represent the xmin of standbys when using hot_standby_feedback. Since we're only transmitting global horizons up from standbys, it has to influence globally (and it would be hard to represent per db horizons anyway).

Got it.  I rewrote the comments and pushed.  Noah, it should be safe
to turn wrasse back on.

			regards, tom lane





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