Andres Freund <> writes:
> It'd be quite possible to address the race-condition by moving the
> updating of the control file to postmaster, to the
> CheckPostmasterSignal(PMSIGNAL_BEGIN_HOT_STANDBY) block. That'd require
> updating the control file from postmaster, which'd be somewhat ugly.

No, I don't like that at all.  Has race conditions against updates
coming from the startup process.

> Perhaps that indicates that field shouldn't be in pg_control, but in the
> pid file?

Yeah, that would be a different way to go at it.  The postmaster would
probably just write the state of the hot_standby GUC to the file, and
pg_ctl would have to infer things from there.

                        regards, tom lane

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