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From: VASUKI M <[email protected]>
To: [email protected]
To: Bo Peng <[email protected]>
Cc: [email protected]
Cc: [email protected]
Subject: Autofail back inconsistent
Date: Tue, 4 Nov 2025 10:53:56 +0530
Message-ID: <CACTYHzhv1K1Jpe+bT0z1Oxod3d0odYW8yLuB_9q5NFyUHY6=zA@mail.gmail.com> (raw)

Hi Pgpool-II Community,

I’ve been working with PostgreSQL for quite some time, and while managing
backend servers with Pgpool-II, I noticed that there’s no built-in data
synchronization before standby nodes are reattached.

To address this, I’ve developed a new enhancement for Pgpool-II called
*“Automatic
Resync and Reattach”*, aimed at improving high availability and reducing
manual intervention after node failures.

This feature automatically performs:

   -

   *pg_rewind synchronization* and *WAL replay* for failed or lagging
   standby nodes
   -

   *Automatic reattachment* of standby nodes once they are safely resynced

This enhancement overcomes some limitations of existing features:

   -

   *Online Recovery* – requires manual execution of pcp_recovery_node
   -

   *Auto Failback* – may reattach inconsistent nodes without synchronization

With *Auto Resync & Reattach*, Pgpool-II ensures data safety and
consistency during failover recovery, providing a more robust and
self-healing HA environment.

I’ve created a dedicated GitHub repository with setup instructions,
configuration samples, and architecture diagrams here:
 https://github.com/BharatDBPG/pgpool2-auto-resync

The repository includes:

   -

   Enhanced failover.sh and follow_primary.sh scripts (handling both
   primary and standby failures)
   -

   A new resync.sh script integrating pg_rewind + WAL replay
   -

   Sample configuration files for a *1 Primary + 2 Standby* setup

I would love to receive feedback or suggestions from the community
regarding possible improvements or integration ideas.

I will be happy to share a patch if needed.
Thank you for your time and support.

Best regards,

*Vasuki MCDAC,CHENNAI*

https://github.com/BharatDBPG/pgpool2-auto-resync

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