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Add GUC option to control maximum active replication origins.

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This commit introduces a new GUC option max_active_replication_origins
to control the maximum number of active replication
origins. Previously, this was controlled by
'max_replication_slots'. Having a separate GUC option provides better
flexibility for setting up subscribers, as they may not require
replication slots (for cascading replication) but always require
replication origins.

Author: Euler Taveira <euler@eulerto.com>
Reviewed-by: Amit Kapila <amit.kapila16@gmail.com>
Reviewed-by: Masahiko Sawada <sawada.mshk@gmail.com>
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
Reviewed-by: vignesh C <vignesh21@gmail.com>
Discussion: https://postgr.es/m/b81db436-8262-4575-b7c4-bc0c1551000b@app.fastmail.com
This commit is contained in:
Masahiko Sawada
2025-03-21 12:20:15 -07:00
parent 0e032a2240
commit 04ff636cbc
12 changed files with 93 additions and 93 deletions
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6
src/backend/replication/logical/launcher.c
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@@ -31,7 +31,7 @@
#include "postmaster/bgworker.h"
#include "postmaster/interrupt.h"
#include "replication/logicallauncher.h"
#include "replication/slot.h"
#include "replication/origin.h"
#include "replication/walreceiver.h"
#include "replication/worker_internal.h"
#include "storage/ipc.h"
@@ -325,10 +325,10 @@ logicalrep_worker_launch(LogicalRepWorkerType wtype,
subname)));
/* Report this after the initial starting message for consistency. */
if (max_replication_slots == 0)
if (max_active_replication_origins == 0)
ereport(ERROR,
(errcode(ERRCODE_CONFIGURATION_LIMIT_EXCEEDED),
errmsg("cannot start logical replication workers when \"max_replication_slots\"=0")));
errmsg("cannot start logical replication workers when \"max_active_replication_origins\"=0")));
/*
* We need to do the modification of the shared memory under lock so that