From: | Joe Conway <mail(at)joeconway(dot)com> |
---|---|
To: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, Merlin Moncure <mmoncure(at)gmail(dot)com> |
Cc: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, David Steele <david(at)pgmasters(dot)net>, "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Subject: | Re: Request: pg_cancel_backend variant that handles 'idle in transaction' sessions |
Date: | 2015-11-05 18:31:08 |
Message-ID: | 563BA06C.3090207@joeconway.com |
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Lists: | pgsql-hackers |
On 11/05/2015 10:09 AM, Pavel Stehule wrote:
> On 5.11.2015 19:02 Merlin Moncure wrote:
>> Thus, I think we have consensus that transaction_timeout is good -- it
>> would deprecate statement_timeout essentially. Likewise,
>> pg_cancel_transaction is good and would deprecate pg_cancel_backend;
>> it's hard for me to imagine a scenario where a user would call
>> pg_cancel_backend if pg_cancel_transaction were to be available.
>
> I am sorry, I see a consensus between you and Stephen only.
S
t C
a<-------------<transaction>--------------->E
r A B A B A n
t <idle> <stmt> <idle> <stmt> <idle> d
|--------======--------======---------------|
Currently we can set timeout and cancel for period B (<stmt>). I can see
based on this discussion that there are legitimate use cases for wanting
timeout and cancel for any of the periods A, B, or C.
I guess the question then becomes how we provide that coverage. I think
for coverage of timeout you need three individual timeout settings.
However for cancel, it would seem that pg_cancel_transaction would cover
all three cases.
Joe
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