Yi Sun <yinan81(at)gmail(dot)com> writes:
> Besides command run(like pg_ctl) can cause "received immediate shutdown
> request" any other reason can cause this please?
That message indicates that something sent the postmaster process a
SIGQUIT signal (which is all that "pg_ctl stop -m immediate" does).
There's no speculation to that: a look at postmaster.c will convince
you that there is no other way to reach that message. So you need
to be looking for things that would be sending SIGQUIT unexpectedly.
I don't know much about Patroni, but maybe something in that
environment thinks that SIGQUIT'ing random processes is a good
thing to do.
regards, tom lane