Re: [Proposal] Fully WAL logged CREATE DATABASE - No Checkpoints

On Thu, Nov 25, 2021 at 10:17 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
> Thanks for the review and many valuable comments, I have fixed all of
> them except this comment (/* If we got a cancel signal during the copy
> of the data, quit */) because this looks fine to me.  0007, I have
> dropped from the patchset for now.  I have also included fixes for
> comments given by John.
>

I found the following issue with the patches applied:

A server crash occurs after the following sequence of commands:

create tablespace tbsp1 location '<directory>/tbsp1';
create tablespace tbsp2 location '<directory>/tbsp2';
create database test1 tablespace tbsp1;
create database test2 template test1 tablespace tbsp2;
alter database test2 set tablespace tbsp1;
checkpoint;

The following type of message is seen in the server log:

2021-12-01 16:48:26.623 AEDT [67423] PANIC:  could not fsync file
"pg_tblspc/16385/PG_15_202111301/16387/3394": No such file or
directory
2021-12-01 16:48:27.228 AEDT [67422] LOG:  checkpointer process (PID
67423) was terminated by signal 6: Aborted
2021-12-01 16:48:27.228 AEDT [67422] LOG:  terminating any other
active server processes
2021-12-01 16:48:27.233 AEDT [67422] LOG:  all server processes
terminated; reinitializing

Also (prior to running the checkpoint command above) I've seen errors
like the following when running pg_dumpall:

pg_dump: error: connection to server on socket "/tmp/.s.PGSQL.5432"
failed: PANIC:  could not open critical system index 2662
pg_dumpall: error: pg_dump failed on database "test2", exiting

Hopefully the above example will help in tracking down the cause.


Regards,
Greg Nancarrow
Fujitsu Australia