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Re: smart shutdown at end of transaction (was: Default mode for shutdown)

From: Magnus Hagander <magnus(at)hagander(dot)net>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: smart shutdown at end of transaction (was: Default mode for shutdown)
Date: 2012-04-27 17:46:13
Message-ID: CABUevEz==_NVEkSEToENEH4Bs1MnWvuOdCwDCxb0uUL1GuXOuw@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Apr 27, 2012 at 19:42, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> On Wed, Dec 15, 2010 at 10:11 AM, Alvaro Herrera
> <alvherre(at)commandprompt(dot)com> wrote:
>> It occurs to me that we may need a new mode, which disconnects sessions
>> that are not in a transaction (or as soon as they are) but leaves
>> in-progress transactions alone; this could be the new default.  Of
>> course, this is much more difficult to implement than the current modes.
>
> This idea appeared to have some support.  I'd like to suggest that we
> take this a step further.  Instead of adding a fourth mode, I'd like
> to suggest that we redefine "smart" to have the behavior described

+1762329!

> above.  This is based on the theory that (1) people who like smart
> shutdown like it because it allows currently-running transactions to
> complete without error, and will find it acceptable to have idle
> transactions terminated immediately and other sessions terminated

Uh, I don't think it's ok to terminate an idle transaction
immediately. An idle *session* is ok, though - maybe that's what you
mean?

Because every transaction that's *doing* multiple things will be idle
for milliseconds every now and then.

-- 
 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/

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