Re: pg15b3: recovery fails with wal prefetch enabled

On Thu, Sep 1, 2022 at 3:08 PM Kyotaro Horiguchi
<horikyota.ntt@gmail.com> wrote:
> At Thu, 1 Sep 2022 12:05:36 +1200, Thomas Munro <thomas.munro@gmail.com> wrote in
> > On Thu, Sep 1, 2022 at 2:01 AM Justin Pryzby <pryzby@telsasoft.com> wrote:
> > > < 2022-08-31 08:44:10.495 CDT  >LOG:  checkpoint starting: end-of-recovery immediate wait
> > > < 2022-08-31 08:44:10.609 CDT  >LOG:  request to flush past end of generated WAL; request 1201/1CAF84F0, current
position1201/1CADB730
 
> > > < 2022-08-31 08:44:10.609 CDT  >CONTEXT:  writing block 0 of relation base/16881/2840_vm
> > > < 2022-08-31 08:44:10.609 CDT  >ERROR:  xlog flush request 1201/1CAF84F0 is not satisfied --- flushed only to
1201/1CADB730
> > > < 2022-08-31 08:44:10.609 CDT  >CONTEXT:  writing block 0 of relation base/16881/2840_vm
> > > < 2022-08-31 08:44:10.609 CDT  >FATAL:  checkpoint request failed
> > >
> > > I was able to start it with -c recovery_prefetch=no, so it seems like
> > > prefetch tried to do too much.  The VM runs centos7 under qemu.
> > > I'm making a copy of the data dir in cases it's needed.
>
> Just for information, there was a fixed bug about
> overwrite-aborted-contrecord feature, which causes this kind of
> failure (xlog flush request exceeds insertion bleeding edge). If it is
> that, it has been fixed by 6672d79139 two-days ago.

Hmm.  Justin, when you built from source, which commit were you at?
If it's REL_15_BETA3, any chance you could cherry pick that change and
check what happens?  And without that, could you show what this logs
for good and bad recovery settings?