| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | 'Ashutosh Bapat' <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
| Cc: | Masahiko Sawada <masahiko(dot)sawada(at)2ndquadrant(dot)com>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)oss(dot)nttdata(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Muhammad Usama <m(dot)usama(at)gmail(dot)com>, Masahiro Ikeda <ikedamsh(at)oss(dot)nttdata(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, amul sul <sulamul(at)gmail(dot)com>, Kyotaro Horiguchi <horikyota(dot)ntt(at)gmail(dot)com>, Álvaro 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>, Tatsuo Ishii <ishii(at)sraoss(dot)co(dot)jp> |
| Subject: | RE: Transactions involving multiple postgres foreign servers, take 2 |
| Date: | 2020-10-20 02:44:09 |
| Message-ID: | TYAPR01MB299000CF6510647AF5B6F4B1FE1F0@TYAPR01MB2990.jpnprd01.prod.outlook.com |
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From: Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com>
> Using pg_cancel_backend() and pg_terminate_backend() a DBA can cancel
> running query from any backend or terminate a backend. For either to
> work the backend needs to be interruptible. IIRC, Robert had made an
> effort to make postgres_fdw interruptible few years back.
Yeah, I know those functions. Sawada-san was talking about Ctrl + C, so I responded accordingly.
Also, how can the DBA find sessions to run those functions against? Can he tell if a session is connected to or running SQL to a given foreign server? Can he terminate or cancel all session with one SQL command that are stuck in accessing a particular foreign server?
Furthermore, FDW is not cancellable in general. So, I don't see a point in trying hard to make only commit be cancelable.
Regards
Takayuki Tsunakawa
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