Date: Fri, 14 Nov 2025 10:46:30 -0500
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
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On Fri, Nov 14, 2025 at 09:55:37AM -0500, Andres Freund wrote:
> Hi,
> 
> On 2025-11-14 09:49:02 -0500, Bruce Momjian wrote:
> > 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.
> 
> It's less wrong, but I don't think this is the right place to add more
> documentation about what replication slots do.

Patch applied.  I can keep improving it as we get more ideas.

-- 
  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.