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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Noah Misch <noah@leadboat.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: David Rowley <dgrowleyml@gmail.com>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: Intermittent buildfarm failures on wrasse
Date: Fri, 15 Apr 2022 11:23:40 -0400
Message-ID: <1643686.1650036220@sss.pgh.pa.us> (raw)
In-Reply-To: <1637671.1650032132@sss.pgh.pa.us>
References: <1521388.1649953580@sss.pgh.pa.us>
	<1547912.1649971995@sss.pgh.pa.us>
	<CAH2-Wz=DHY2LV7=2aVd=qz6AbQhFK7KJRNL5ZwgB7dyno_gzdg@mail.gmail.com>
	<1553951.1649975018@sss.pgh.pa.us>
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	<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>

I wrote:
> So there's no longer any doubt that something is holding back OldestXmin.
> I will go put some instrumentation into the code that's computing that.

The something is the logical replication launcher.  In the failing runs,
it is advertising xmin = 724 (the post-initdb NextXID) and continues to
do so well past the point where tenk1 gets vacuumed.

Discuss.

			regards, tom lane





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