| From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pg_ctl emits strange warning message |
| Date: | 2010-09-14 00:39:13 |
| Message-ID: | AANLkTinCgAygX5gLE7J1A8gPQOHzMxBUkvuuSJ_W9K0Z@mail.gmail.com |
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On Tue, Sep 14, 2010 at 12:35 AM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
> Hmm, looking at this more closely, I'm a bit confused. We already rename
> away backup_label at the beginning of recovery. Under what circumstances do
> we have a problem? This starts to seem like a complete non-issue to me.
A checkpoint record is read before backup_label file is renamed, so
the problem happens if shutdown is requested while the standby server
is waiting for the WAL containing a checkpoint record to arrive from
the master. This happened some times in my box when testing HS/SR.
To avoid the problem, we should rename backup_label before reading
any WAL record?
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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