[pgpool-general: 4289] Re: Pgpool watchdog 3.4

Muhammad Usama m.usama at gmail.com
Tue Jan 5 21:24:27 JST 2016

Hi Derek

Unfortunately the watchdog in pgpool-II 3.4 and older version does not
handle the network isolation and split-brain situations very well.
Currently we are in the process of overhauling the watchdog for pgpool-II
3.5 which is in the beta at the moment and is planned to be released
sometime this month. The new enhanced watchdog for pgpool-II 3.5 has
addressed this and other watchdog related issues and hopefully will provide
a better experience and more features.

Best regards
Muhammad Usama

On Tue, Jan 5, 2016 at 11:33 AM, Derek <derek_kouch at yahoo.com.au> wrote:
> Hi,
> I've got a split brain question. Sorry for the long email.
> If the master pgpool server is disconnected from the network but is still
running, when it reconnects after 10 minutes or longer, the master pgpool
server's watchdog is still thinks it is still the master and it thinks the
other pgpool server is down. However, it has lost the virtual ip to a new
master. So when the new master is down, the old master does not get the
virtual ip back because it still thinks it is already the master. In the
end, the virtual ip is down.
> Does the watchdog communicate with each other after reconnecting to the
network after a long absence?
> Is there a setting that I need to set to get the watchdogs to talk to
each and to resolve who is the true master and who should get control of
the virtual ip?
> Kind regards,
> Derek.
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> pgpool-general at pgpool.net
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