From: Bruce Momjian <bruce@momjian.us>
To: Andres Freund <andres@anarazel.de>
Cc: pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: doc: remove verbiage about "receiving" data from rep. slots
Date: Fri, 14 Nov 2025 09:49:02 -0500
Message-ID: <aRdBXmI7lmLkEaDf@momjian.us> (raw)
In-Reply-To: <pexmenhqptw5h4ma4qasz3cvjtynivxprqifgghdjtmkxdig2g@djg7bk2p6pts>
References: <E1vJuHW-006ZaM-2j@gemulon.postgresql.org>
<gwo2ql4qlydwkmsurbz3gflnom5nq2p4wbbrz4xium7g75nnfp@4yohqyq5ijx5>
<53n63x724ahx2nwx42bmivjlt67fpbyh44knx7jazodsqcs5av@umzjyyg3clpq>
<aRc40Suvuda74Hmx@momjian.us>
<pexmenhqptw5h4ma4qasz3cvjtynivxprqifgghdjtmkxdig2g@djg7bk2p6pts>
On Fri, Nov 14, 2025 at 09:25:20AM -0500, Andres Freund wrote:
> Hi,
>
> On 2025-11-14 09:12:33 -0500, Bruce Momjian wrote:
> > On Fri, Nov 14, 2025 at 09:05:07AM -0500, Andres Freund wrote:
> > > Hi,
> > >
> > > On 2025-11-14 09:02:12 -0500, Andres Freund wrote:
> > > > On 2025-11-14 13:56:06 +0000, Bruce Momjian wrote:
> > > > > doc: remove verbiage about "receiving" data from rep. slots
> > > > >
> > > > > The slots are just LSN markers, not something to receive from.
> > > >
> > > > I think this is wrong. Logical slots also preserve resources other than WAL.
> > >
> > > I also think that the complaint about slots not being something to receive
> > > from is simply wrong for logical slots.
> >
> > Uh, can you clarify since I can't find details on what they preserve.
>
> Slots (physical ones can, logical ones always do), prevent row cleanup on the
> primary.
I see your point. How is the attached patch? The link right after the
modified text talks only about WAL retention, so I think we need
something in this sentence to say we do more than WAL retention for
logical replication slots.
--
Bruce Momjian <bruce@momjian.us> https://momjian.us
EDB https://enterprisedb.com
Do not let urgent matters crowd out time for investment in the future.
Attachments:slot.diff (text/x-diff, 814B) downloaddiff --git a/doc/src/sgml/logical-replication.sgml b/doc/src/sgml/logical-replication.sgmlindex 8a9674bd6d1..aa013f348d4 100644--- a/doc/src/sgml/logical-replication.sgml+++ b/doc/src/sgml/logical-replication.sgml@@ -225,8 +225,9 @@
</para>
<para>
- By default a new subscription creates a logical replication slot on the- publisher and then uses this slot to preserve necessary WAL (see <xref+ By default a new subscription creates a logical replication slot on+ the publisher and then uses this slot to track relevant transaction+ activity and preserve necessary WAL (see <xref
linkend="streaming-replication-slots"/>). Additional replication
slots may be required for the initial data synchronization of
pre-existing table data and those will be dropped at the end of data
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To: pgsql-committers@postgresql.org
Cc: bruce@momjian.us, andres@anarazel.de, pgsql-committers@lists.postgresql.org
Subject: Re: pgsql: doc: remove verbiage about "receiving" data from rep. slots
In-Reply-To: <aRdBXmI7lmLkEaDf@momjian.us>
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