From: | Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com> |
---|---|
To: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
Cc: | Sergei Kornilov <sk(at)zsrv(dot)org>, nasbyj(at)amazon(dot)com, Andres Freund <andres(at)anarazel(dot)de>, Robert Haas <robertmhaas(at)gmail(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: pgsql: Improve autovacuum logging for aggressive and anti-wraparound ru |
Date: | 2018-09-28 04:53:14 |
Message-ID: | CAD21AoAV17jQH6__E8_VQePms4NptX0X50U=98qJ5RNV7au1iw@mail.gmail.com |
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On Tue, Sep 25, 2018 at 6:11 AM Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> wrote:
>
> On 2018-Sep-24, Sergei Kornilov wrote:
>
> > Hi
> >
> > > An autovacuum can't be just aggressive; it's either anti-wraparound or normal.
> > But autovacuum _can_ be aggressive and not anti-wraparound.
> > I build current master and can see 3 different line types:
> > 2018-09-24 23:47:31.500 MSK 27939 @ from [vxid:4/272032 txid:0] [] LOG: automatic aggressive vacuum of table "postgres.public.foo": index scans: 0
> > 2018-09-24 23:49:27.892 MSK 28333 @ from [vxid:4/284297 txid:0] [] LOG: automatic aggressive vacuum to prevent wraparound of table "postgres.public.foo": index scans: 0
> > 2018-09-24 23:49:29.093 MSK 28337 @ from [vxid:4/284412 txid:0] [] LOG: automatic vacuum of table "postgres.public.foo": index scans: 0
>
> Exactly.
>
> It cannot be anti-wraparound and not aggressive, which is the line type
> not shown.
>
> "Aggressive" means it scans all pages; "anti-wraparound" means it does
> not let itself be cancelled because of another process waiting for a
> lock on the table.
>
I agree. Can we fix this simply by the attached patch?
Regards,
--
Masahiko Sawada
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center
Attachment | Content-Type | Size |
---|---|---|
fix_autovacuum_log.patch | application/octet-stream | 820 bytes |
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