Re: [Patch] ALTER SYSTEM READ ONLY

On Thu, Jul 29, 2021 at 4:47 PM Dilip Kumar <dilipbalaut(at)gmail(dot)com> wrote:
>
> On Wed, Jul 28, 2021 at 5:03 PM Amul Sul <sulamul(at)gmail(dot)com> wrote:
> >
> > I was too worried about how I could miss that & after thinking more
> > about that, I realized that the operation for ArchiveRecoveryRequested
> > is never going to be skipped in the startup process and that never
> > left for the checkpoint process to do that later. That is the reason
> > that assert was added there.
> >
> > When ArchiveRecoveryRequested, the server will no longer be in
> > the wal prohibited mode, we implicitly change the state to
> > wal-permitted. Here is the snip from the 0003 patch:
> >
> > @@ -6614,13 +6629,30 @@ StartupXLOG(void)
> > (errmsg("starting archive recovery")));
> > }
> >
> > - /*
> > - * Take ownership of the wakeup latch if we're going to sleep during
> > - * recovery.
> > - */
> > if (ArchiveRecoveryRequested)
> > + {
> > + /*
> > + * Take ownership of the wakeup latch if we're going to sleep during
> > + * recovery.
> > + */
> > OwnLatch(&XLogCtl->recoveryWakeupLatch);
> >
> > + /*
> > + * Since archive recovery is requested, we cannot be in a wal prohibited
> > + * state.
> > + */
> > + if (ControlFile->wal_prohibited)
> > + {
> > + /* No need to hold ControlFileLock yet, we aren't up far enough */
> > + ControlFile->wal_prohibited = false;
> > + ControlFile->time = (pg_time_t) time(NULL);
> > + UpdateControlFile();
> > +
>
> Is there some reason why we are forcing 'wal_prohibited' to off if we
> are doing archive recovery? It might have already been discussed, but
> I could not find it on a quick look into the thread.
>

Here is: https://postgr.es/m/CA+TgmoZ=CCTbAXxMTYZoGXEgqzOz9smkBWrDpsacpjvFcGCuaw@mail.gmail.com

Regards,
Amul