From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
---|---|
To: | Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com> |
Cc: | Muhammad Usama <m(dot)usama(at)gmail(dot)com>, amul sul <sulamul(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Ildar Musin <ildar(at)adjust(dot)com>, Kyotaro HORIGUCHI <horiguchi(dot)kyotaro(at)lab(dot)ntt(dot)co(dot)jp>, Chris Travers <chris(dot)travers(at)adjust(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, "Tsunakawa, Takayuki" <tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> |
Subject: | Re: Transactions involving multiple postgres foreign servers, take 2 |
Date: | 2020-06-12 03:40:05 |
Message-ID: | CAA4eK1+8rFeQLE2NORXeiw79pqH94Y5wp+xy6K46WKG5bJH6vw@mail.gmail.com |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-hackers |
On Fri, Jun 12, 2020 at 7:59 AM Masahiko Sawada
<masahiko(dot)sawada(at)2ndquadrant(dot)com> wrote:
>
> On Thu, 11 Jun 2020 at 22:21, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> >
>
> > I have another question about
> > this field, why can't it be one of the status ('preparing',
> > 'prepared', 'committing', 'aborting', 'in-doubt') rather than having a
> > separate field?
>
> Because I'm using in-doubt field also for checking if the foreign
> transaction entry can also be resolved manually, i.g.
> pg_resolve_foreign_xact(). For instance, a foreign transaction which
> status = 'prepared' and in-doubt = 'true' can be resolved either
> foreign transaction resolver or pg_resolve_foreign_xact(). When a user
> execute pg_resolve_foreign_xact() against the foreign transaction, it
> sets status = 'committing' (or 'rollbacking') by checking transaction
> status in clog. The user might cancel pg_resolve_foreign_xact() during
> resolution. In this case, the foreign transaction is still status =
> 'committing' and in-doubt = 'true'. Then if a foreign transaction
> resolver process processes the foreign transaction, it can commit it
> without clog looking.
>
I think this is a corner case and it is better to simplify the state
recording of foreign transactions then to save a CLOG lookup.
--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com
From | Date | Subject | |
---|---|---|---|
Next Message | Fujii Masao | 2020-06-12 03:56:16 | Re: Resetting spilled txn statistics in pg_stat_replication |
Previous Message | Greg Stark | 2020-06-12 03:35:19 | Re: Default setting for enable_hashagg_disk |