From: | Fujii Masao <masao(dot)fujii(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, "Kolb, Harald (NSN - DE/Munich)" <harald(dot)kolb(at)nsn(dot)com> |
Subject: | Re: pg_subtrans keeps bloating up in the standby |
Date: | 2010-08-27 17:17:10 |
Message-ID: | AANLkTikenWVxB6nf_dES2P9092NaFCgPPtK4_KcPXRD6@mail.gmail.com |
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Lists: | pgsql-hackers |
On Sat, Aug 28, 2010 at 2:08 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Fujii Masao <masao(dot)fujii(at)gmail(dot)com> writes:
>> On Fri, Aug 27, 2010 at 11:25 PM, Heikki Linnakangas
>> <heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>>> Hmm, agreed, seems like an oversight in hot standby. Before that, we didn't
>>> update pg_subtrans during recovery, so there was no point truncating it. But
>>> in hot standby, we do update it, so we need to truncate it too.
>
>> Yes. The attached patch changes a restartpoint so that it truncates pg_subtrans
>> when hot standby is enabled.
>
> Has StartupSUBTRANS been done?
Yes. StartupXLOG calls that before bgwriter is invoked. That is, we can
ensure that StartupSUBTRANS has always been done before bgwriter
performs a restartpoint.
Regards,
--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
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