Re: Master-slave failover question

CCin the community mailing list
On Wed, Jan 8, 2014 at 3:02 PM, Jayadevan M <maymala(dot)jayadevan(at)gmail(dot)com>wrote:

> I am using pgpool with streaming replication option for PostgreSQL, with a
> failover command (shell script). 2 pgpool instances (with watchdog) on the
> database nodes. You were referring to split brain for pgpool instances or
> PostgreSQL instances?
>
>
>
> I was talking about split-brain for pgpool which cascades to respective
PostgreSQL instances i.e. pgpool would think that the other node is lost
and hence it assume itself as only available pgpool+DB node and hence
pgpool on slave will switchover to its on DB and pgpool on master will
consider slave to be lost. This can happen if there is a network
fluctuation between slave and master (can be avoided with redundant network
path/line between two servers).

I do not understand if you are using HA mode, how come you are not using
Virtual IP (you mentioned earlier).

Just curious - once pgpool switches to the slave, it will mark it as primary
> (I did not use virtual IPs.) So spli-brain scenarion will not happen,right?

Am I missing something here? or some mode of pgpool which I am not aware
of?