[pgpool-general: 2929] Re: Connections stuck in CLOSE_WAIT, again
ishii at postgresql.org
Thu Jun 19 08:29:56 JST 2014
You said your developer found pgpool child process in DISCARD state.
Please attach gdb to the process in DISCARD state and take
backtrace. Also I need actual netsta -anp outputs.
SRA OSS, Inc. Japan
> Hi Tatsuo,
> We are facing this same problem, and as I see it remains unsolved (or
> perhaps they didn't report the solution).
> We are using pgpool 3.3.3, with two postgres 9.1 in streaming
> replication. The OS is Debian 3.2.54-2 (64bits).
> The log shows messages like this:
> ProcessFrontendResponse: failed to read kind from frontend. frontend
> abnormally exited
> I'm not sure but it looks like one for each connection left unclosed.
> Also, a ps -ef returns a lot of pgpool children in DISCARD state. And
> the netstat -anp, gives the correspondent TCP connection in CLOSE_WAIT
> The developer has checked the client process is closing the
> connections and we try connecting directly to the postgres and it
> worked fine.
> When you say "to attach debugger", do you mean change log_statment =
> true or debug_level to a value other than 0 or any other procedure?
> Many thanks,
> Juanjo Pérez
> El 02/04/14 01:05, Tatsuo Ishii escribió:
>>> We have a client on 3.3 experiencing the the problem noted here:
>>> strace is showing the child processes at:
>>> child_tidptr=0x7fcf659f3a10) = 6258
>>> I didn't see any resolution of that issue; is there data we can gather
>>> to assist?
>> I followed the old 2012 posting with:
>>> That means pgpool does not close the socket connected to by your
>>> applications. Is it possible to attach debugger to such that pgpool
>>> process to see what pgpool is doing?
>> But I got no response until now. Can you please do this?
>> Best regards,
>> Tatsuo Ishii
>> SRA OSS, Inc. Japan
>> English: http://www.sraoss.co.jp/index_en.php
>> Japanese: http://www.sraoss.co.jp
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