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

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Peter Eisentraut <peter_e(at)gmx(dot)net>
Cc: Andres Freund <andres(at)anarazel(dot)de>, pgsql-hackers(at)postgresql(dot)org, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)commandprompt(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>
Subject: Re: smart shutdown at end of transaction (was: Default mode for shutdown)
Date: 2012-04-28 15:12:19
Message-ID: 26227.1335625939@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
> On fre, 2012-04-27 at 22:30 +0200, Andres Freund wrote:
>> In the few cases where I investigated it TMs don't use transactions
>> themselves (which I think is correct, they don't need them), so
>> terminating any idle session - which the TM would appear as, as its
>> not using txns - would leave prepared transactions in a limbo state
>> till the database is up again, instead of waiting till all prepared
>> transactions are either aborted or committed. It may also choose to
>> coordinate to abort all transactions, but all that is hard if the
>> database shuts you out.

> This would lead to another shutdown mode, one that terminates idle
> sessions unless they have prepared transactions.  That could be useful.

Huh?  Prepared transactions aren't associated with sessions.  At least
not in a context using a TM --- the TM will be doing commits or
rollbacks from a session different from the ones that ran the prepared
transactions.

			regards, tom lane

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