[pgpool-hackers: 4120] Re: Failover on starting up

[Tatsuo Ishii]

I have looked into pgpool.conf. You need to set other than 0 to
search_primary_node_timeout. pgpool will not start up until
search_primary_node_timeout is expired.

> I have attached both, logs and conf file.
> On 6 Feb 2022, 2:46 AM +0100, Tatsuo Ishii <ishii at sraoss.co.jp>, wrote:
>> Have you enabled health check?
>> Can you share pgpool.conf?
>>
>> > But that’s the issue - pgpool didn’t perform a failover.
>> >
>> > It just said this and then gave up:
>> > 2022-02-04 16:48:53: pid 9: LOG: ignoring the failover request, since we are still starting up
>> > On 6 Feb 2022, 2:32 AM +0100, Tatsuo Ishii <ishii at sraoss.co.jp>, wrote:
>> > > But after starting up pgpool will detect that the primary went down by
>> > > health check and perform failover anyway, no?
>> > >
>> > > > Thank you Tatsuo for your reply but can’t pgpool setup the other resources regardless of the primary being up and then perform the failover?
>> > > >
>> > > > I need this behaviour because I cannot pgpool in cluster mode due to infrastructure limitations.
>> > > >
>> > > > Cheers
>> > > >
>> > > > Anirudh
>> > > > On 6 Feb 2022, 1:51 AM +0100, Tatsuo Ishii <ishii at sraoss.co.jp>, wrote:
>> > > > > > Hello
>> > > > > >
>> > > > > > I have a setup with 1 pgpool and 2 postgresql primary-replica nodes.
>> > > > > >
>> > > > > > I am testing a certain scenario - what if the pgpool goes down, then the primary goes down and then the pgpool comes back up.
>> > > > > >
>> > > > > > I was expecting that pgpool would perform a failover after it comes back up but instead it says this:
>> > > > > > 2022-02-04 16:48:53: pid 9: LOG: Pgpool-II parent process has received failover request
>> > > > > > 2022-02-04 16:48:53: pid 9: LOG: ignoring the failover request, since we are still starting up
>> > > > > >
>> > > > > > So my question is, is there a parameter or some way that we can tell pgpool to perform a failover if the primary is down while pgpool is starting up?
>> > > > > >
>> > > > > > I tried looking at the code but according to https://github.com/pgpool/pgpool2/blob/master/src/main/pgpool_main.c#L1329, I don¢t see a parameter other than processState.
>> > > > > >
>> > > > > > Is there a logical reason why pgpool cannot/won't perform a failover during startup?
>> > > > >
>> > > > > Because pgpool needs to setup various resouses including shared memory
>> > > > > and others for managing failover.
>> > > > >
>> > > > > Best reagards,
>> > > > > --
>> > > > > Tatsuo Ishii
>> > > > > SRA OSS, Inc. Japan
>> > > > > English: http://www.sraoss.co.jp/index_en.php
>> > > > > Japanese:http://www.sraoss.co.jp