| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(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: | 2015-05-29 16:43:34 |
| Message-ID: | CA+TgmoYc_CTsgsGk3FPOCxyPh_g4k_MxgpVQiGi5R_0Jtqsgig@mail.gmail.com |
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| Lists: | pgsql-general pgsql-hackers |
On Fri, May 29, 2015 at 10:17 AM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> writes:
>> On Fri, May 29, 2015 at 11:24 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
>>> B. We need to change find_multixact_start() to fail softly.
>
>> Here is an experimental WIP patch that changes StartupMultiXact and
>> SetMultiXactIdLimit to find the oldest multixact that exists on disk
>> (by scanning the directory), and uses that if it is more recent than
>> the oldestMultiXactId from shmem,
>
> Not sure about the details of this patch, but I was planning to propose
> what I think is the same thing: the way to make find_multixact_start()
> fail softly is to have it find the oldest actually existing file if the
> one that should be there isn't.
Working on that now.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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