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moment the master disappears, but in case of two pgpool nodes which
point to the same set of servers, what would the behavior be?

In effect, the first pgpool that detects the failing master will do
the switch and trigger the slave into master mode, what would the
other pgpool do, attempt to trigger backend1 into master mode as well?
will it detect that the master was already triggered, etc.

I will be trying this in practice but would be great to hear other
peoples experience.

Thanks in advance!
Lou