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Re: declare/fetch problem with pgpool 2.2.3; Postgres 8.4; ODBC

From: Hiroshi Inoue <inoue(at)tpf(dot)co(dot)jp>
To: Andreas Gaab <A(dot)Gaab(at)scanlab(dot)de>
Cc: "'pgsql-odbc(at)postgresql(dot)org'" <pgsql-odbc(at)postgresql(dot)org>
Subject: Re: declare/fetch problem with pgpool 2.2.3; Postgres 8.4; ODBC
Date: 2009-12-04 23:27:07
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-odbc
Hi Andreas,

Sorry for the delay.

The recent pgpool-II 2.2.6 release seems to contain the bug fix.
Thanks to pgpool team.

Hiroshi Inoue

Hiroshi Inoue wrote:
> Andreas Gaab wrote:
>>> -----Urspr√ľngliche Nachricht-----
>>> Von: Hiroshi Inoue [mailto:inoue(at)tpf(dot)co(dot)jp] Gesendet: Donnerstag, 19. 
>>> November 2009 23:12
>>> An: Andreas Gaab
>>> Cc: 'pgsql-odbc(at)postgresql(dot)org'
>>> Betreff: Re: [ODBC] declare/fetch problem with pgpool 2.2.3; Postgres 
>>> 8.4; ODBC
>>> Hi Andreas,
>>> Andreas Gaab wrote:
>>>> I encountered a problem using pgpool with two identical postgres 8.4 
>>>> servers as  backends.> 
>>>> Activating the odbc-setting declare/fetch, our application creates 
>>>> an data mismatch error. 
>>>> As far as I can track down the problem, it is caused because the 
>>>> cursors are defined after an BEGIN, thus with load balancing 
>>>> disabled, but are CLOSED after the COMMIT, thus are only closed on 
>>>> one server. This leads to data inconsistency for the next query 
>>>> DECLARING an cursor.
>>> Unfortunately I'm not familiar with pgpool.
>>> Are DECLARE, FETCH and CLOSE regarded as members of SELECT family ?
>>> If so, I'm suspicios if it's appropriate.
>>> I would ask pgpool guys about it.
>>> regards,
>>> Hiroshi Inoue
>> Hi Hiroshi,
>> DECLARE, FETCH and CLOSE are probably regarded as members of the 
>> SELECT family and thus are load balanced. The problem arises, because 
>> the cursors are defined inside BEGIN; ... COMMIT; , and thus are send 
>> to all backends, but are CLOSEd after the transaction, and thus load 
>> balanced, which leaves on cursor defined on one backend.
>> The transaction block and handling of cursor is done by the odbc, 
>> isn't it?
> Hi Andreas,
> I told pgpool guys this issue at JPUGCon Yesterday.
> I would get a reply in a few days.
> regards,
> Hiroshi Inoue

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