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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: Peter Geoghegan <pg@bowt.ie>
Cc: PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Subject: Re: buildfarm: could not read block 3 in file "base/16384/2662": read only 0 of 8192 bytes
Date: Wed, 29 Aug 2018 16:41:42 -0400
Message-ID: <32197.1535575302@sss.pgh.pa.us> (raw)
In-Reply-To: <20180829201648.cqxw6ft547csnhrc@alap3.anarazel.de>
References: <2e674bd6-3bc2-9d70-7d03-db48f7ea5877@2ndquadrant.com>
	<fcab55ec-660a-bc43-7fe1-09af3665e89a@2ndquadrant.com>
	<20180811140823.gyxqbtjbr5uitgsf@alap3.anarazel.de>
	<20180828075213.yqyl3w2gpd5heopd@alap3.anarazel.de>
	<20180829025658.brk3hfdczo3f73al@alap3.anarazel.de>
	<6970.1535512705@sss.pgh.pa.us>
	<20180829032714.6yu3bxdywcvyj2li@alap3.anarazel.de>
	<20180829032908.o46wdjmti6c6dfep@alap3.anarazel.de>
	<20180829083730.n645apqhb2gyih3g@alap3.anarazel.de>
	<24986.1535565612@sss.pgh.pa.us>
	<20180829201648.cqxw6ft547csnhrc@alap3.anarazel.de>

Andres Freund <andres@anarazel.de> writes:
> On 2018-08-29 14:00:12 -0400, Tom Lane wrote:
>> 2. I think we may need to address the same order-of-operations hazards
>> as RelationCacheInvalidate() worries about.  Alternatively, maybe we
>> could simplify that function by making it use the same
>> delayed-revalidation logic as we're going to develop for this.

> Hm, just to make sure I understand correctly: You're thinking about
> having to rebuild various nailed entries in a specific order [2]?

> [2] Hm, I'm right now a bit confused as to why "Other nailed relations
> go to the front of rebuildList" is a good idea.

I'm not recalling the reason right now either, but I'm pretty sure that
logic was added out of necessity ... it hasn't always been like that.

			regards, tom lane




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