[pgpool-general: 944] Re: pgpool and OTRS

Tatsuo Ishii ishii at postgresql.org
Mon Sep 3 16:17:09 JST 2012

> Hi all, 
> i have recently moved a database from Mysql to postgresql 9.1.5 which is behind a pgpool-II-3.1.4 . Everything went fine until i observed that some "tickets" are not created correctly by the application (OTRS) that populate the database.
> After some debugging i found/guess that the problem is the following:
> when a cron job wants to create a ticket he has to insert info in abut 10 tables, and i guess that the 2-nd, 3-rd ... inserts depends on the first. 
> The problem was that this operation is not performed transactionally so after the first insert, when the app tries to perform the other inserts, first tries to select "the first insert", but this first insert is still not propagated to all nodes, and the error occurs.
> I`m aware of the fact that if this entire operation would be performed transactionally (only on master) the issue is solved, but unfortunately i cannot modify the app.
> So i want to know if there is any way that i can tell to pgpool something like : 
> any request from this ip do not load balance.
> PS. temporary i have set the weight factor to 0 to the 2-nd and 3-rd postgresql slaves and it behaves ok, because reads and writes only from master.

Controlling behavior of load balance based on client IP is not too
difficult. However since it's a completely new functionilty, it might
be be added to 3.3 in the nearest future.
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

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