| From: | Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com> |
|---|---|
| To: | m(dot)litsarev(at)postgrespro(dot)ru, vignesh C <vignesh21(at)gmail(dot)com> |
| Cc: | Michael Paquier <michael(at)paquier(dot)xyz>, pgsql-hackers(at)lists(dot)postgresql(dot)org |
| Subject: | Re: SQL function which allows to distinguish a server being in point in time recovery mode and an ordinary replica |
| Date: | 2025-04-02 15:57:13 |
| Message-ID: | 4dc90367-35b9-4b66-83f9-84c960900c6f@oss.nttdata.com |
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| Lists: | pgsql-hackers |
On 2025/03/26 5:26, m(dot)litsarev(at)postgrespro(dot)ru wrote:
> Hi!
>
>> I felt you might have missed attaching the test patches added at [1].
> Well, the tests were written for the initial proposal which (after Michael's review and advices) has been fixed and updated. The original tests became not relevant actually. That is why I dropped them.
>
>> This change is not required:
> Placed back the empty line. The v7 patch is attached.
Wouldn't pg_last_wal_receive_lsn() be almost sufficient for the purpose?
It generally returns NULL in archive recovery mode and a valid LSN
in standby mode. While it's not a perfect solution since it may return NULL
in standby mode until the WAL receiver starts, but it should work in most cases.
Thought?
Regards,
--
Fujii Masao
Advanced Computing Technology Center
Research and Development Headquarters
NTT DATA CORPORATION
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