Thanks a lot Michael for the explanation.
On 2021-12-13 4:05 a.m., Michael Paquier wrote:
> On Fri, Dec 10, 2021 at 01:44:40PM -0800, David Zhang wrote:
>> Inside the test script `src/test/recovery/t/001_stream_rep.pl`, a comment at
>> line 30 says `my_backup` is "not mandatory",
>>
>> 30 # Take backup of standby 1 (not mandatory, but useful to check if
>> 31 # pg_basebackup works on a standby).
>> 32 $node_standby_1->backup($backup_name);
>>
>> however if remove the backup folder "my_backup" after line 32, something
>> like below,
> Well, the comment is not completely incorrect IMO. In this context, I
> read taht that we don't need a backup from a standby and we could just
> take a backup from the primary instead. If I were to fix something, I
> would suggest to reword the comment as follows:
> # Take backup of standby 1 (could be taken from the primary, but this
> # is useful to check if pg_basebackup works on a standby).
>
>> And then the test script takes another backup `my_backup_2`, but it seems
>> this backup is not used anywhere.
> This had better stay around, per commit f267c1c. And as far as I can
> see, we don't have an equivalent test in a different place, where
> pg_basebackup runs on a standby while its *primary* is stopped.
> --
> Michael
--
David
Software Engineer
Highgo Software Inc. (Canada)
www.highgo.ca