On Thu, May 21, 2020 at 5:38 PM Santhosh Kumar <krssanth...@gmail.com> wrote: > > Hi Forum, > If I have a cluster with Synchronous replication enabled with three nodes, > for eg: > > [primary] [hot stand by 1] [host stand by 2] > > And for some unforeseen reasons, if primary fails, the failover will kick in > and hot stand by 1 will become new primary and cluster setup will look like > this > > [new primary (hot stand by1)] [host stand by 2] > > My question here is, what will happen if the original primary which has > failed comes back. Will it become part of this high available replica cluster > automatically or it will be stale and disconnected from the cluster? >
It won't become standby automatically as it would have diverged from the new master. > How can we automatically make the failed primary to be part of the cluster > with hot standby role? It would be of great help, if you can direct me to any > references details. Thank you, upfront. > I think pg_rewind can help in such situations. See the docs of pg_rewind [1]. [1] - https://www.postgresql.org/docs/devel/app-pgrewind.html -- With Regards, Amit Kapila. EnterpriseDB: http://www.enterprisedb.com
