From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Andres Freund <andres(at)anarazel(dot)de>, Michael Paquier <michael(dot)paquier(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: forcing a rebuild of the visibility map |
Date: | 2016-06-20 21:23:33 |
Message-ID: | CA+TgmoY4EgOwCqTKoShirXSA8T5osDOkkvPYtKWzp1z_1xqeLw@mail.gmail.com |
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On Mon, Jun 20, 2016 at 4:57 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Andres Freund <andres(at)anarazel(dot)de> writes:
>> I also don't see why it's a good idea to have knowledge about how to
>> truncate the visibility map outside of visibilitymap.c. Having that in a
>> contrib module just seems like a modularity violation.
>
> That seems like a pretty good argument.
I agree that's a good argument but it passes over one or two points
which motivated my approach. Most of the work of truncating the
visibility map is, in fact, encapsulated by visibilitymap_truncate, so
the only knowledge we're exporting to the contrib module is what WAL
record to emit. I put that in the caller of visibilitymap_truncate
because the only existing caller of visibilitymap_truncate is
RelationTruncate, which also knows what WAL record to emit on behalf
of visibilitymap.c. So I don't think I've exported any more knowledge
from visibilitymap.c than was the case previously.
That having been said, if somebody wants to whack this around, I am
not going to put up a big fight.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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