From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
---|---|
To: | Andres Freund <andres(at)anarazel(dot)de> |
Cc: | 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: | 2015-06-02 15:46:39 |
Message-ID: | CA+Tgmob+jh4oWcdKKJ9u=B9Jmya2u=hMHK8Jvyj3aPByTnpbGA@mail.gmail.com |
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On Tue, Jun 2, 2015 at 11:36 AM, Andres Freund <andres(at)anarazel(dot)de> wrote:
>> That would be a departure from the behavior of every existing release
>> that includes this code based on, to my knowledge, zero trouble
>> reports.
>
> On the other hand we're now at about bug #5 attributeable to the odd way
> truncation works for multixacts. It's obviously complex and hard to get
> right. It makes it harder to cope with the wrong values left in
> datminxid etc. So I'm still wondering whether fixing this for good isn't
> the better approach.
It may well be. But I think we should do something more surgical
first. Perhaps we can justify the pain and risk of making changes to
the WAL format in the back-branches, but let's not do it in a rush.
If we can get this patch to a state where it undoes the damage
inflicted in 9.3.7/9.4.2, then we will be in a state where we have as
much reliability as we had in 9.3.6 plus the protections against
member-space wraparound added in 9.3.7 - which, like the patch I'm
proposing now, were directly motivated by multiple, independent bug
reports. That seems like a good place to get to. If nothing else, it
will buy us some time to figure out what else we want to do.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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