[pgpool-general: 5183] Re: Architecture Questions

Muhammad Usama m.usama at gmail.com
Tue Dec 20 23:27:04 JST 2016


Can you please explain a little more about your concerns of the split-brain
situation you want to avoid?

As far as I understand from the architecture diagram the proposed
deployment consists of four PostgreSQL servers (Two in each AWS
availability zone) and the Pgpool-II servers in front of each PostgreSQL.
And the Application servers can connect to any of the four available
Pgpool-II, So this seems like an active-active Pgpool-II configuration.
Which means you would not be using the floating-IP (delegate IP) with the

So if this is correct and you are not planing to use the floating IP and
master-standby configuration of Pgpool-II, What worries you about the

Best regards
Muhammad Usama

On Tue, Dec 20, 2016 at 5:07 AM, Tatsuo Ishii <ishii at sraoss.co.jp> wrote:

> Usama,
> Any suggestion for this?
> Best regards,
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese:http://www.sraoss.co.jp
> > I have some questions about how best to avoid split brain situations for
> an upcoming deploy on AWS.  I’ve attached a diagram of the proposed
> layout.  I’m going to have database and application servers in two AWS
> regions with a internal corporate network connection between AWS regions.
> My big concern is avoiding split brain between regions if my corporate
> network link between the regions goes down.  My question is should I have
> an odd number of PgPool servers in each region or more pgPool servers in
> one region over the other.   Right now I’m planning on running PgPool and
> the Postgres Database on the same servers.   Planned versions are PgPool
> 3.5.4 and Postgres 9.5.
> >
> > See attached PDF for a diagram.
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