At present PostgreSQL doesn't support for reloading of recovery.conf parameters via SIGHUP. To prevent recovery.conf reload for master IP, I can manage internal DNS to always point to the current master. However there are some cases where old master will come up as standby before the new master is elected. In this case it will lead to cascading replication.
So to overcome such cases reboot is a required. It can be achieved by restarting the wal receiver process too. But there is no straight forward way of restarting wal receiver process. The only way i figured out is to kill the wal receiver process. Postmaster will take care of restarting the wal receiver process. But here my worry is, will there be any side effect if i kill wal receiver process (even using TERM signal)?
From: Madan Kumar [mailto:madankumar1993@gmail.com] Sent: Tuesday, October 30, 2018 7:20 AM To:pgsql-general@lists.postgresql.org Subject: How to change standby node to sync from the new master without rebooting the PostgreSQL service?
Hi,
Whenever there is a change in master, PostgreSQL service on standby nodes must be restarted (after changing the master IP in the recovery.conf) to ensure it is syncing with the new master.
Is there a way to point to new master without reboot of PostgreSQL on the standby?
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