Re: Inconsistency in startup process's MyBackendId and procsignal array registration with ProcSignalInit()

[Andres Freund]

Hi,

On 2021-10-11 15:24:46 +0900, Fujii Masao wrote:
> How about modifying SharedInvalBackendInit() so that it accepts
> BackendId as an argument and allocates the ProcState entry of
> the specified BackendId? That is, the startup process determines
> that its BackendId is "MaxBackends + MyAuxProcType (=StartupProcess) + 1"
> in AuxiliaryProcessMain(), and then it passes that BackendId to
> SharedInvalBackendInit() in InitRecoveryTransactionEnvironment().

If I understand correctly what you're proposing, I think that's going in the
wrong direction. We should work towards getting rid of BackendIds
instead. This whole complication vanishes if we make sinvaladt use pgprocno.

See https://postgr.es/m/20210802171255.k4yv5cfqaqbuuy6f%40alap3.anarazel.de
for some discussion of this.

Greetings,

Andres Freund