On Wed, Aug 05, 2020 at 06:36:15PM +0000, Mariya Rampurawala wrote: > What I want to understand is that, in case of replication link > failure, there will still be inserts happening at the master > node. In that case, how will the slave know if it is up-to-date?
It cannot do that by itself, which is why in common HA scenarios you have a witness host that acts as a monitoring instance for the primary and the standby so as you limit SPOF issues. This depends of course on your application requirements, but you can also leverage things by using a replication lag in bytes on the primary, and even couple that with synchronous replication to check when commits are getting blocked. IMO, I think that you should try to not reinvent the wheel and use one of the solutions provided by the community, pg_auto_failover coming into my mind as one solution for example. -- Michael
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