[pgpool-general: 1581] Re: pgpool 3.2.3 node gets down after some hours of work.

[Dzmitry]

May be this is the case why node shown as down:
2013-04-08 07:41:16 LOG:   pid 381: ProcessFrontendResponse: failed to
read kind from frontend. frontend abnormally exited
2013-04-08 07:41:16 LOG:   pid 444: ProcessFrontendResponse: failed to
read kind from frontend. frontend abnormally exited
2013-04-08 07:41:17 LOG:   pid 4113: ProcessFrontendResponse: failed to
read kind from frontend. frontend abnormally exited
2013-04-08 07:44:09 LOG:   pid 331: ProcessFrontendResponse: failed to
read kind from frontend. frontend abnormally exited
 ?


Thanks,
  Dzmitry





On 4/8/13 2:03 AM, "Tatsuo Ishii" <ishii at postgresql.org> wrote:

>>> May be this will help:
>>> 
>>> 2013-04-07 11:48:52 LOG:   pid 9785: do_child: exits with status 1 due
>>>to
>>> error
>>> 2013-04-07 11:48:52 LOG:   pid 9760: pool_read_kind: error message
>>>from 2
>>> th backend:canceling statement due to conflict with recovery
>>> 2013-04-07 11:48:53 LOG:   pid 9767: detect_stop_postmaster_error:
>>> detect_error error
>>> 2013-04-07 11:48:53 LOG:   pid 9767: detect_postmaster_down_error
>>>returns
>>> error on backend 2. Going to close this session.
>>> 2013-04-07 11:59:28 LOG:   pid 9651: do_child: exits with status 1 due
>>>to
>>> error
>> 
>> Those themselves do not related to node down or fail over.
>> 
>> Anyway are yo still using 3.2.3? or upgraded to 3.2-stable?
>
>Oops. You already told me you upgraded to 3.2-stable.
>
>> Also do yo see this kind of message?
>> 
>> 	 pool_log("postmaster on DB node %d was shutdown by administrative
>>command", i);
>> 
>> If you see this, someone used pg_terminate_backend(). This makes
>> pgpool confuses because it returned exactly same error code as
>> postmaster shutdown. So pgpool will detach the node where the function
>> issued.
>
>More thought. If fail_over_on_backend_error = on, pgpool will trigger
>fail over when read/write errors are detected on the socket to
>PostgreSQL connection. Turning this off may help for an environment
>where network connection is flakey.
>--
>Tatsuo Ishii
>SRA OSS, Inc. Japan
>English: http://www.sraoss.co.jp/index_en.php
>Japanese: http://www.sraoss.co.jp