Re: BUG #16927: Postgres can`t access WAL files

The strange thing is why one server works fine on unpatched binaries while
the second one requires a patched version to get rid of pg_wal access
error.
UPD: just right now on developer server I got an error: "2021-03-18
14:11:39.444 EET [892] LOG:  could not rename file
"pg_wal/00000001000009130000006F": Permission denied"
Will switch to patched binaries and tell you later.
P.S: Sorry, that I didn't include in reply psql-bugs, is it ok right now?

чт, 18 мар. 2021 г. в 13:15, Michael Paquier <michael@paquier.xyz>:

> On Thu, Mar 18, 2021 at 12:44:29PM +0200, Ярослав Пашинский wrote:
> > So, I started test on my Windows server that we using for replica on
> > instance, which I copied from master. The binarys was unpatched, that
> > you sent me here. The system is: windows server 2016, os build
> 14393.4283.
> > To emulate load I used pgbench with such parameters -t 10000 -c 50 -j 20.
> > After couple of running test in log file I found almost same errors:
> > "2021-03-18 11:27:14.322 EET [3748] LOG:  could not rename temporary
> > statistics file "pg_stat_tmp/global.tmp" to "pg_stat_tmp/global.stat":
> > Permission denied
> > 2021-03-18 11:27:18.928 EET [692] LOG:  using stale statistics instead of
> > current ones because stats collector is not responding"
> > ...and
> > "2021-03-18 11:48:49.630 EET [6476] LOG:  could not rename file
> > "pg_wal/00000001000000650000008F": Permission denied"
> > So I decided to switch to patched binaries and sometimes get only this
> one
> > error:
> > "2021-03-18 12:27:14.571 EET [4840] LOG:  could not rename temporary
> > statistics file "pg_stat_tmp/global.tmp" to "pg_stat_tmp/global.stat":
> > Permission denied
> > 2021-03-18 12:27:19.178 EET [7556] LOG:  using stale statistics instead
> of
> > current ones because stats collector is not responding"
> > Which is not very critical, so it`s ok.
>
> Okay, so it looks like a very good news to me.  With the patched
> binaries you are not seeing the renaming problem with the WAL files
> anymore.
>
> > On other hand, on developer server (Windows Server 2016 (version 1607, OS
> > build 14393.4225))  with real load and unpatched binaries now I got no
> > errors about about pg_wal and gets only twice this error:
> > "2021-03-18 12:07:26.153 EET [2956] LOG:  could not rename temporary
> > statistics file "pg_stat_tmp/global.tmp" to "pg_stat_tmp/global.stat":
> > Permission denied"
> >
> > So, keep testing. That's strange for now. I am thinking about changing
> > binaries on prod server, but it will be possible on Saturday.
>
> Yes, I think that it would be good to do more tests, as it may be
> possible that what you are seeing does not repeat.  What you are
> reporting is encouraging though.  Thanks!
>
> By the way, it is very important to report that to the community
> mailing lists.  Could you add pgsql-bugs when replying please?
> --
> Michael
>