Re: storing an explicit nonce

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Stephen Frost <sfrost(at)snowman(dot)net>
Cc: Antonin Houska <ah(at)cybertec(dot)at>, Andres Freund <andres(at)anarazel(dot)de>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Tom Kincaid <tomjohnkincaid(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>
Subject: Re: storing an explicit nonce
Date: 2021-05-26 20:42:22
Message-ID: 20210526204222.GX3048@momjian.us
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On Wed, May 26, 2021 at 03:49:43PM -0400, Stephen Frost wrote:
> Greetings,
>
> * Bruce Momjian (bruce(at)momjian(dot)us) wrote:
> > OK, that's what I thought. We already expose the clog and fsm, so
> > exposing the hint bits seems acceptable. If everyone agrees, I will
> > adjust my patch to not WAL log hint bit changes.
>
> Robert pointed out that it's not just hint bits where this is happening
> though, but it can also happen with btree line pointer arrays. Even if
> we were entirely comfortable accepting that the hint bits are leaked
> because of this, leaking the btree line pointer array doesn't seem like
> it could possibly be acceptable..
>
> I've not run down that code myself, but I don't have any reason to doubt
> Robert's assessment.

OK, I guess we could split out log_hints to maybe just FPW-log btree
changes or something, but my recent email questions why wal_log_hints is
an issue anyway.

--
Bruce Momjian <bruce(at)momjian(dot)us> https://momjian.us
EDB https://enterprisedb.com

If only the physical world exists, free will is an illusion.

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