[pgpool-general: 2426] Re: watchdog: different statuses on different pgpool nodes.

Sergey Arlashin sergeyarl.maillist at gmail.com
Thu Jan 16 04:16:56 JST 2014


I edited pgpool init script so that it starts pgpool with -D option now. 
But the problem seems to remain :(


pgpool-node1:~# ps uax |grep -i 'pgpool -n '
postgres  2253  0.0  0.5 170860  5312 pts/0    S    19:08   0:00 /usr/sbin/pgpool -n -D

pgpool-node1:~# psql -U postgres -h localhost -p 9999
Password for user postgres:
psql (9.3.2)
Type "help" for help.

postgres=# show pool_nodes;
 node_id |   hostname    | port | status | lb_weight |  role
---------+---------------+------+--------+-----------+---------
 0       | db-node1.site | 5432 | 2      | 0.500000  | primary
 1       | db-node2.site | 5432 | 2      | 0.500000  | standby
(2 rows)


pgpool-node2:~# ps uax |grep -i 'pgpool -n '
postgres  3528  0.0  0.5 103188  5236 pts/0    S    19:05   0:00 /usr/sbin/pgpool -n -D


pgpool-node2:~# psql -U postgres -h watchdog.mutual-ip -p 9999
Password for user postgres:
psql (9.3.2)
Type "help" for help.

postgres=# show pool_nodes;
 node_id |   hostname    | port | status | lb_weight |  role
---------+---------------+------+--------+-----------+---------
 0       | db-node1.site | 5432 | 3      | 0.500000  | standby
 1       | db-node2.site | 5432 | 2      | 0.500000  | primary
(2 rows)


pgpool-node2 is primary at the moment. I started pgpool on pgpool-node1 after pgpool-node2. 

Both pgpools are running with -D option (as I showed above). But pgpool-node1 hasn't synchronised its status with pgpool-node2 after start. 





On Jan 15, 2014, at 5:28 PM, Lazaro Ruben Garcia Martinez <lgarciam at vnz.uci.cu> wrote:

> Try to start pgpool with -D option. The purpose of this option is discard pgpool_status file and do not restore previous status. May be possible that some time ago the server 1 was stopped and this result was stored in pgpool_status file.
> 
> Regards.
> ________________________________________
> De: pgpool-general-bounces at pgpool.net [pgpool-general-bounces at pgpool.net] En nombre de Yugo Nagata [nagata at sraoss.co.jp]
> Enviado el: miércoles, 15 de enero de 2014 5:26
> Para: Sergey Arlashin
> CC: pgpool-general at pgpool.net
> Asunto: [pgpool-general: 2413] Re: watchdog: different statuses on different pgpool nodes.
> 
> Hi,
> 
> On Wed, 15 Jan 2014 12:44:40 +0400
> Sergey Arlashin <sergeyarl.maillist at gmail.com> wrote:
> 
>> Hi!
>> 
>> I'm trying set up watchdog and cannot figure out why sometimes I get different statuses on different pgpool nodes. It looks like this:
>> 
>> Two nodes : pgpool-node1and pgpool-node2. Watchdog mutual IP address is currently assigned to pgpool-node1.
>> 
>> pgpool-node1:~# psql -U postgres -h watchdog.mutual-ip -p 9999
>> 
>> Password for user postgres:
>> psql (9.3.2)
>> Type "help" for help.
>> 
>> postgres=# show pool_nodes;
>> node_id |   hostname    | port | status | lb_weight |  role
>> ---------+---------------+------+--------+-----------+---------
>> 0       | db-node1.site | 5432 | 2      | 0.500000  | primary
>> 1       | db-node2.site | 5432 | 2      | 0.500000  | standby
>> (2 rows)
>> 
>> 
>> 
>> pgpool-node2:~# psql -U postgres -h localhost -p 9999
>> Password for user postgres:
>> psql (9.3.2)
>> Type "help" for help.
>> 
>> postgres=# show pool_nodes;
>> node_id |   hostname    | port | status | lb_weight |  role
>> ---------+---------------+------+--------+-----------+---------
>> 0       | db-node1.site | 5432 | 2      | 0.500000  | primary
>> 1       | db-node2.site | 5432 | 3      | 0.500000  | standby
>> (2 rows)
> 
> This means that pgpool on pgpool-node2 regards backend node #1 as down.
> If there are no messages about failover in the log, this might be because
> pgpool read old pgpool_status at startup for lack of -D option.
> 
>> 
>> I cannot see any problems in pgpool logs. Or any other indication that something goes wrong.
>> 
>> Could you please tell me why this could happen?
>> 
>> 
>> Thanks in advance.
>> 
>> --
>> Best regards,
>> Sergey Arlashin
>> 
>> 
>> _______________________________________________
>> pgpool-general mailing list
>> pgpool-general at pgpool.net
>> http://www.pgpool.net/mailman/listinfo/pgpool-general
> 
> 
> --
> Yugo Nagata <nagata at sraoss.co.jp>
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> 
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> 
> Fin a la injusticia, LIBERTAD AHORA A NUESTROS CINCO COMPATRIOTAS QUE SE ENCUENTRAN INJUSTAMENTE EN PRISIONES DE LOS EEUU!
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