| From: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
|---|---|
| To: | Jelte Fennema-Nio <postgres(at)jeltef(dot)nl> |
| Cc: | Noah Misch <noah(at)leadboat(dot)com>, Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jacob Champion <jacob(dot)champion(at)enterprisedb(dot)com>, Denis Laxalde <denis(dot)laxalde(at)dalibo(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Greg Stark <stark(at)mit(dot)edu>, "Gregory Stark (as CFM)" <stark(dot)cfm(at)gmail(dot)com>, Jelte Fennema <Jelte(dot)Fennema(at)microsoft(dot)com>, Daniel Gustafsson <daniel(at)yesql(dot)se>, Peter Eisentraut <peter(at)eisentraut(dot)org>, Andres Freund <andres(at)anarazel(dot)de>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-hackers(at)lists(dot)postgresql(dot)org, Etsuro Fujita <etsuro(dot)fujita(at)gmail(dot)com> |
| Subject: | Re: [EXTERNAL] Re: Add non-blocking version of PQcancel |
| Date: | 2024-06-25 05:00:00 |
| Message-ID: | ecd2358c-2128-877b-c680-23b377394285@gmail.com |
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| Lists: | pgsql-hackers |
24.06.2024 01:59, Jelte Fennema-Nio wrote:
> On Sat, 22 Jun 2024 at 17:00, Alexander Lakhin <exclusion(at)gmail(dot)com> wrote:
>> @@ -2775,6 +2775,7 @@
>> SET LOCAL statement_timeout = '10ms';
>> select count(*) from ft1 CROSS JOIN ft2 CROSS JOIN ft4 CROSS JOIN ft5; -- this takes very long
>> ERROR: canceling statement due to statement timeout
>> +WARNING: could not get result of cancel request due to timeout
>> COMMIT;
> As you describe it, this problem occurs when the cancel request is
> processed by the foreign server, before the query is actually
> received. And postgres then (rightly) ignores the cancel request. I'm
> not sure if the existing test is easily changeable to fix this. The
> only thing that I can imagine works in practice is increasing the
> statement_timeout, e.g. to 100ms.
I'd just like to add that that one original query assumes several "remote"
queries (see the attached excerpt from postmaster.log with verbose logging
enabled).
Best regards,
Alexander
| Attachment | Content-Type | Size |
|---|---|---|
| postmaster.log.txt | text/plain | 4.0 KB |
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