| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Noah Misch <noah(at)leadboat(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Steve Kehlet <steve(dot)kehlet(at)gmail(dot)com>, Forums postgresql <pgsql-general(at)postgresql(dot)org>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: [HACKERS] Re: 9.4.1 -> 9.4.2 problem: could not access status of transaction 1 |
| Date: | 2015-06-04 17:31:29 |
| Message-ID: | CA+TgmoYycfD4DY46wLEViwFLqy90PSrWUenp+1OpbOXjFqLWDg@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-general pgsql-hackers |
On Thu, Jun 4, 2015 at 1:27 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> On 2015-06-04 12:57:42 -0400, Robert Haas wrote:
>> + /*
>> + * Do we need an emergency autovacuum? If we're not sure, assume yes.
>> + */
>> + return !oldestOffsetKnown ||
>> + (nextOffset - oldestOffset > MULTIXACT_MEMBER_SAFE_THRESHOLD);
>
> I think without teaching autovac about those rules, this might just lead
> to lots of autovac processes starting without knowing they should do
> something? They know about autovacuum_multixact_freeze_age, but they
> know neither about !oldestOffsetKnown nor, afaics, about pending offset
> wraparounds?
You're right, but that's why the latest patch has changes in
MultiXactMemberFreezeThreshold.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Alvaro Herrera | 2015-06-04 18:22:22 | Re: Re: [GENERAL] 9.4.1 -> 9.4.2 problem: could not access status of transaction 1 |
| Previous Message | Andres Freund | 2015-06-04 17:27:19 | Re: Re: [GENERAL] 9.4.1 -> 9.4.2 problem: could not access status of transaction 1 |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Tom Lane | 2015-06-04 17:32:18 | Re: brin regression test intermittent failures |
| Previous Message | Andres Freund | 2015-06-04 17:27:19 | Re: Re: [GENERAL] 9.4.1 -> 9.4.2 problem: could not access status of transaction 1 |