[pgpool-general: 5677] Re: find_primary_node problem

[Nagy Ákos]

2017. 08. 02. 12:13 keltezéssel, Tatsuo Ishii írta:
> From: Nagy Ákos <nagy.akos at libreoffice.ro>
> Subject: Re: [pgpool-general: 5667] find_primary_node problem
> Date: Wed, 2 Aug 2017 12:06:21 +0300
> Message-ID: <fc3952a4-f53c-4abf-d717-c3f94f782134 at libreoffice.ro>
>
>> 2017. 08. 02. 9:34 keltezéssel, Tatsuo Ishii írta:
>>>> Hi,
>>>>
>>>> I installed a two member pgpool+postgresql cluster, and I have an
>>>> interesting problem.
>>>>
>>>> I use LDX containers and ubuntu as OS, and after a clean install I can
>>>> start pgpool2 without any problem, but after a service restart or
>>>> failover, pgpool2 can't check the primary node from postgresql
>>>> master-slave cluster.
>>>>
>>>> I got this error (and after 300 seconds - check interval - the pgpool2
>>>> service remain started, but can't connect to postgresql, and can't
>>>> determinate the master node):
>>>>
>>>> Aug  1 07:30:00 sd-ro-tm-dev-pg-01 pgpool[27998]: [27-1] 2017-08-01
>>>> 07:30:00: pid 27998: LOG:  find_primary_node: checking backend no 0
>>>> Aug  1 07:30:00 sd-ro-tm-dev-pg-01 pgpool[27998]: [28-1] 2017-08-01
>>>> 07:30:00: pid 27998: LOG:  find_primary_node: checking backend no 1
>>> No error logs found? Strange...
>>>
>>> Is it possible for you to enable debug log of Pgpool-II?
>> Yes, I enable debug log, and I got:
>> LOG:  find_primary_node: checking backend no 0
>> LOG:  find_primary_node: checking backend no 1
>> DEBUG:  pool_read: read 13 bytes from backend 0
>> DEBUG:  authenticate kind = 5
>> DEBUG:  pool_write: to backend: 0 kind:p
>> DEBUG:  pool_read: read 318 bytes from backend 0
>> DEBUG:  authenticate kind = 0
>> DEBUG:  authenticate backend: key data received
>> DEBUG:  authenticate backend: transaction state: I
>> DEBUG:  do_query: extended:0 query:"SELECT pg_is_in_recovery()"
>> DEBUG:  pool_write: to backend: 0 kind:Q
>> DEBUG:  pool_read: read 75 bytes from backend 0
>> DEBUG:  do_query: kind: 'T'
>> DEBUG:  do_query: received ROW DESCRIPTION ('T')
>> DEBUG:  do_query: row description: num_fileds: 1
>> DEBUG:  do_query: kind: 'D'
>> DEBUG:  do_query: received DATA ROW ('D')
>> DEBUG:  do_query: kind: 'C'
>> DEBUG:  do_query: received COMMAND COMPLETE ('C')
>> DEBUG:  do_query: kind: 'Z'
>> DEBUG:  do_query: received READY FOR QUERY ('Z')
>> DEBUG:  pool_write: to backend: 0 kind:X
>> DEBUG:  find_primary_node: 1 node is standby
>> DEBUG:  find_primary_node: no primary node found
>>
>> Manually I can connect from each pgpool host to each postgresql
>> instance, and I can run this query: SELECT pg_is_in_recovery()
>> On the primary node I got:
>> pg_is_in_recovery
>> -------------------
>>  f
>> (1 row)
>>
>> and on the secondary:
>>  pg_is_in_recovery
>> -------------------
>>  t
>> (1 row)
> Pgpool-II version?
ii  pgpool2                          3.6.5-1.pgdg16.04+1
ii  postgresql-9.6-pgpool2           3.6.5-1.pgdg16.04+1
>
> Best regards,
> --
> Tatsuo Ishii
> SRA OSS, Inc. Japan
> English: http://www.sraoss.co.jp/index_en.php
> Japanese:http://www.sraoss.co.jp


-- 
Ákos