RE: pg_createsubscriber: allow duplicate publication names

From: "Hayato Kuroda (Fujitsu)" <kuroda(dot)hayato(at)fujitsu(dot)com>
To: 'Amit Kapila' <amit(dot)kapila16(at)gmail(dot)com>, Chao Li <li(dot)evan(dot)chao(at)gmail(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Shubham Khanna <khannashubham1197(at)gmail(dot)com>
Subject: RE: pg_createsubscriber: allow duplicate publication names
Date: 2026-06-02 10:01:07
Message-ID: OS9PR01MB12149561C881BFA9DFB10B149F5122@OS9PR01MB12149.jpnprd01.prod.outlook.com
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Dear Amit,

> Can't we use --replication-slot=name to avoid this ERROR? I mean use
> different replication slot names.

Are you saying the below case, right? It can work.

```
$ pg_createsubscriber -D data_sta/ -P 'user=postgres port=5432' -d postgres --subscription sub --replication-slot=slot1 -d testdb --subscription sub --replication-slot=slot2 -U postgres
```

BTW; slot creations are tried before the standby promotes, thus there may be a chance
user read the error message, change the subscription name, and retry. But I still
think we should guard the combination, which means it's too late for PG19.

Best regards,
Hayato Kuroda
FUJITSU LIMITED

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