RE: How to setup Multi-master replication on postgresql 18 - Mailing list pgsql-admin
PostgreSQL logical replication supports bidirectional setups, but conflict handling is not automated. The documentation itself highlights that conflicts can arise when multiple nodes accept writes and resolving them is left to the application or design strategy.
If the requirement is strictly open-source and limited to core PostgreSQL, the most direct option would be bi-directional logical replication (native or pglogical).
That said, PostgreSQL does not provide a fully managed multi-master solution. In practice, this means:
- No built-in conflict resolution (conflicts can stop replication)
- Risk of duplicate keys / concurrent update issues
- Sequences need coordination (or UUIDs)
- DDL is not automatically replicated
- Operational complexity increases significantly
Because of this, the safest approach is usually to define data ownership per node (e.g., by tenant or region) to avoid conflicts rather than trying to resolve them after the fact.
Otherwise, pure core PostgreSQL multi-master setups can be difficult to operate reliably in production.
Regards
From: Rajni Baliyan <saan654@gmail.com>
Sent: Tuesday, April 7, 2026 4:16 AM
To: Muhammet Kurtoğlu <muhammet.kurtoglu@bisoft.com.tr>
Cc: akshay chandratre <akshaychandratre44@gmail.com>; Mahendra Singh <msmahendrasingh18@gmail.com>; Pgsql-admin <pgsql-admin@lists.postgresql.org>
Subject: Re: How to setup Multi-master replication on postgresql 18
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Hi Muhammet,
You can achieve at certain level multi master replication using postgres native logical replication. Latest version 18 has good conflict resolution as well.
On Tue, 7 Apr 2026, 5:17 pm Muhammet Kurtoğlu, <muhammet.kurtoglu@bisoft.com.tr> wrote:
You can use pg_logical extension then
7 Nis 2026 Sal, saat 10:09 tarihinde akshay chandratre <akshaychandratre44@gmail.com> şunu yazdı:
Hi Muhammet,
Thanks for suggesting symetricds community.
Will check that out. But my organization wants something open-source. And on core postgresql.
On Mon, Apr 6, 2026 at 5:13 PM Mahendra Singh <msmahendrasingh18@gmail.com> wrote:
Dear Akshay,
The answer is EDB Postgres Distributed.
On Mon, Apr 6, 2026 at 11:09 AM Muhammet Kurtoğlu <muhammet.kurtoglu@bisoft.com.tr> wrote:
Hi,
You can use symetricds community which resolves conflicts with predefined rules on master master replication
Best REgards
akshay chandratre <akshaychandratre44@gmail.com>, 6 Nis 2026 Pzt, 09:25 tarihinde şunu yazdı:
Hi Everyone,
The client required the multimaster replication on the production environment. I want help regarding the following things:
1. How to setup multi-master replication on postgresql ?
2. How to handle the conflicts regarding the writes on both masters servers ?
3. Is it reliable for production ? Any other suggestions or options for multimaster ?
Postgresql V18
Os: centOS
Thanks in advance...
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