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

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, 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 18:38:10
Message-ID: CA+U5nM+YsW5t+gUft=0+_KxnmSwBDie8wSRMuiDm=9h-GzJkzw@mail.gmail.com
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On Fri, Apr 27, 2012 at 7:29 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Robert Haas <robertmhaas(at)gmail(dot)com> writes:
>> 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
>> above.
>
> No, I'm not happy with that.  Smart shutdown is defined to not affect
> current sessions.  I'm fine with having a fourth mode that acts as you
> suggest (and, probably, even with making it the default); but not with
> taking away a behavior that people may well be relying on.

Agreed, but not sure what to call the new mode: "smarter"?

--
 Simon Riggs                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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