[pgpool-general: 2585] Re: pgpool with JDBC for load balancing

Anupama Ramaswamy anumr_0123 at yahoo.com
Sun Feb 16 22:09:05 JST 2014

I did as you suggested. But no every update to the database fails with

"unnamed prepared statement does not exist"
Here is my setup.
I have host db1 running postgresql 9.1 (master)
host db2 running postgresql 9.1 (slave)
Postgres Streaming replication is setup between the 2 servers
Pgpool is running on a separate host pgp3 with 
load_balance_mode = on
master_slave_mode = on
master_slave_sub_mode = 'stream'
replication_mode = off

I have tried with 3.1.10, 3.2.7 and 3.3.2 all with same result.

I have attached my pgpool.conf and the debug logs I get for 3.1.10 and 3.3.2

Can you please help ?

Is there a minimal working java application (may be a test case ?) I can get that can demonstrate that pgpool works with jdbc drivers / load balancing and postgres streaming replication ?

Thanks for your help.

On Thursday, February 13, 2014 10:36 AM, Tatsuo Ishii <ishii at postgresql.org> wrote:
Recently a bug which might be related to your report was found:


Please grab 3.3-stable head and try again.


Best regards,
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp

> Hello,
> I have to setup pgpool for load balancing only and it has to work with an web application in Java.
> There are several posts on the net as well as mailing lists regarding the problems with this setup, yet nothing conclusive. All that I have tried so far has only led me to 
> "unnamed prepared statement does not exist"
> So my question is -
> 1) Is there a checklist of things that I need to do to get pgpool load balancing to work with simple JDBC connection with Postgres 9.1 in stream replication / hotstandby mode. 
> 2) Is there a anything test case or something that can demonstrate that pgpool indeed works with JDBC in load balancing mode.
> I don't need any other capability of pgpool - no connection pool, replication, parallel query, nothing at all.
> Regards,
> Anupama.
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