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

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Magnus Hagander <magnus(at)hagander(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: smart shutdown at end of transaction (was: Default mode for shutdown)
Date: 2012-04-28 11:08:42
Message-ID: CA+U5nM+nQgbgib4v=CRt3kGqN73q-ekHfPjZNJVw6cCoTg9GNA@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Fri, Apr 27, 2012 at 8:36 PM, Heikki Linnakangas
<heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:

> All the modes indeed wait (except for immediate), so I think it would make
> sense to define the modes in terms of *what* they wait for.
>
>        wait sessions   - allow existing sessions to finish (old "smart")
>        wait transactions       - allow existing transactions to finish (new)
>        wait checkpoint - kill active queries
>        wait none - unclean shutdown
>
> Hmm, the latter two are perhaps a bit confusing. So maybe:
>
>        wait_sessions   - allow existing sessions to finish (old "smart")
>        wait_transactions       - allow existing transactions to finish (new)
>
>        fast    - kill active queries
>        immediate - unclean shutdown
>
> Just thinking out loud here..

+1

Wonderfully clear, little need to check the docs to see what the terms
actually mean.

New names for both allow us to deprecate use of "smart", since it was
a silly term anyway. We keep smart for one more
release==wait_sessions, then throw an error in later releases.

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

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