| From: | Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de>, Nikhil Sontakke <nikhil(dot)sontakke(at)2ndquadrant(dot)com> |
| Cc: | pgsql-hackers(at)lists(dot)postgresql(dot)org, Nikhil Sontakke <nikhils(at)2ndquadrant(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Craig Ringer <craig(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Sokolov Yura <y(dot)sokolov(at)postgrespro(dot)ru>, Stas Kelvich <s(dot)kelvich(at)postgrespro(dot)ru>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Robert Haas <robertmhaas(at)gmail(dot)com> |
| Subject: | Re: [HACKERS] logical decoding of two-phase transactions |
| Date: | 2018-03-30 19:05:29 |
| Message-ID: | 3cca7c66-2a5e-a3c1-a197-9bb107e0b69f@2ndquadrant.com |
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| Lists: | pgsql-hackers |
On 30/03/18 20:50, Andres Freund wrote:
> Hi,
>
> On 2018-03-30 23:49:43 +0530, Nikhil Sontakke wrote:
>>> Quick thought: Should be simple to release lock when interacting with network.
>>
>> I don’t think this will be that simple. The network calls will
>> typically happen from inside the plugins and we don’t want to make
>> plugin authors responsible for that.
>
> You can just throw results away... ;). I'm not even kidding. We've all
> the necessary access in the callback for writing from a context.
>
You mean, if we detect abort in the write callback, set something in the
context which will make all the future writes noop until it's reset
again after we yield back to the logical decoding?
That's not the most beautiful design I've seen, but I'd be okay with
that, it seems like it would solve all the issues we have with this.
--
Petr Jelinek http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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