[SR-Users] Reconnection to db
Javier Gallart
jgallartm at gmail.com
Sun Jan 16 18:17:56 CET 2011
Hi Daniel,
I'm using postgres 8.4 at the server and libpq5 library for the client. I've
been testing again and the problem is that after a db restart (no matter if
done through a service restart or having t down for some time), the
PQstatus(CON_CONNECTION(_con)) function returns a CONNECTION_OK and
therefore it doesn't try to reconnect. It's on the second attempt of the
mt_reload that it returns the correct CONNECTION_BAD value, and reconnection
at that point works perfectly well.
First attempt after db restart (I've added a dbg message if we get a
CONNECTION_OK):
Jan 16 12:03:00 kam-test ./kamailio[22214]: DEBUG: db_postgres
[km_dbase.c:129]: connection OK
Jan 16 12:03:00 kam-test ./kamailio[22214]: DEBUG: db_postgres
[km_dbase.c:155]: sending query ok: 0x92f888 - [select tname,tprefix,tvalue
from mtree order by tname]
Jan 16 12:03:00 kam-test ./kamailio[22214]: DEBUG: <core> [db_res.c:118]:
allocate 48 bytes for result set at 0x94cd08
Jan 16 12:03:00 kam-test ./kamailio[22214]: DEBUG: db_postgres
[km_dbase.c:222]: 0x92f888 PQresultStatus(PGRES_FATAL_ERROR)
PQgetResult(0x1a30d10)
Jan 16 12:03:00 kam-test ./kamailio[22214]: ERROR: db_postgres
[km_dbase.c:238]: 0x92f888 - invalid query, execution aborted
Jan 16 12:03:00 kam-test ./kamailio[22214]: ERROR: db_postgres
[km_dbase.c:239]: 0x92f888 - PQresultStatus(PGRES_FATAL_ERROR)
Jan 16 12:03:00 kam-test ./kamailio[22214]: ERROR: db_postgres
[km_dbase.c:240]: 0x92f888: server closed the connection
unexpectedly#012#011This probably means the server terminated
abnormally#012#011before or while processing the request.#012
Second attempt:
Jan 16 12:03:08 kam-test ./kamailio[22214]: DEBUG: db_postgres
[km_dbase.c:132]: connection reset
Jan 16 12:03:08 kam-test ./kamailio[22214]: DEBUG: db_postgres
[km_dbase.c:315]: PQclear(0x1a30d10) result set
Jan 16 12:03:08 kam-test ./kamailio[22214]: DEBUG: db_postgres
[km_dbase.c:155]: sending query ok: 0x92f888 - [select tname,tprefix,tvalue
from mtree order by tname]
Thanks!
Javi
On Fri, Jan 14, 2011 at 11:42 AM, Daniel-Constantin Mierla <
miconda at gmail.com> wrote:
> Hello,
>
> what version of postgres and postgres client library are you using?
>
> According to the docs from devel manual, this is the function that should
> be used to reconnect:
>
> PQreset Resets the communication channel to the server.
>
> void PQreset(PGconn *conn);
>
> This function will close the connection to the server and attempt to
> reestablish a new connection to the same server, using all the same
> parameters previously used. This may be useful for error recovery if a
> working connection is lost.
>
> You may see more here:
>
> http://www.network-theory.co.uk/docs/postgresql/vol2/DatabaseConnectionControlFunctions.html
>
> Somehow seems not to work in this case. Can you try also with a shorter
> down time for postgres server, like a normal restart? Would be intrested to
> see if the client side loses somehow connection parameters due to long time
> unconnected.
>
> Cheers,
> Daniel
>
>
> On 1/14/11 11:15 AM, Javier Gallart wrote:
>
> Hi Daniel
>
>
> this is my test:
>
> 1- Kamailio starts and correctly loads the mtree
> 2- I make whatever modification in the tree and reload with mt_reload
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_dbase.c:153]: sending query ok: 0x92f880 - [select tname,tprefix,tvalue
> from mtree order by tname]
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:118]:
> allocate 48 bytes for result set at 0x94cd00
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_dbase.c:220]: 0x92f880 PQresultStatus(PGRES_TUPLES_OK)
> PQgetResult(0x29f05f0)
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_res.c:108]: 3 columns returned from the query
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:155]:
> allocate 24 bytes for result names at 0x94cc60
> [....]
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_res.c:267]: freeing row buffer at 0x94c940
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: mtree [mtree.c:738]:
> adding new tname [1]
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:54]:
> freeing 3 rows
> [...]
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:94]:
> freeing result names at 0x94cc60
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:99]:
> freeing result types at 0x94cbc0
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:136]:
> freeing result set at 0x94cd00
> Jan 14 04:19:06 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_dbase.c:313]: PQclear(0x29f05f0) result set
>
> 3. Postgres DB restarts (either through restart, or /stop/wait a
> minute/start)
> No log is written in Kamailio when this happens.
>
> 4.- I try again to reload the tree, and these are the logs:
> Jan 14 04:21:42 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_dbase.c:153]: sending query ok: 0x92f880 - [select tname,tprefix,tvalue
> from mtree order by tname]
> Jan 14 04:21:42 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:118]:
> allocate 48 bytes for result set at 0x94cd00
> Jan 14 04:21:42 kam-test ./kamailio[31205]: DEBUG: db_postgres
> [km_dbase.c:220]: 0x92f880 PQresultStatus(PGRES_FATAL_ERROR)
> PQgetResult(0x29ef0a0)
> Jan 14 04:21:42 kam-test ./kamailio[31205]: ERROR: db_postgres
> [km_dbase.c:236]: 0x92f880 - invalid query, execution aborted
> Jan 14 04:21:42 kam-test ./kamailio[31205]: ERROR: db_postgres
> [km_dbase.c:237]: 0x92f880 - PQresultStatus(PGRES_FATAL_ERROR)
> Jan 14 04:21:42 kam-test ./kamailio[31205]: ERROR: db_postgres
> [km_dbase.c:238]: 0x92f880: server closed the connection
> unexpectedly#012#011This probably means the server terminated
> abnormally#012#011before or while processing the request.#012
> Jan 14 04:21:42 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:81]:
> freeing 0 columns
> Jan 14 04:21:42 kam-test ./kamailio[31205]: DEBUG: <core> [db_res.c:136]:
> freeing result set at 0x94cd00
> Jan 14 04:21:42 kam-test ./kamailio[31205]: ERROR: mtree [mtree_mod.c:633]:
> Error while fetching result
> Jan 14 04:21:42 kam-test ./kamailio[31205]: ERROR: db_postgres
> [km_dbase.c:329]: invalid parameter value
> Jan 14 04:21:42 kam-test ./kamailio[31205]: ERROR: mtree [mtree_mod.c:744]:
> cannot re-load info from database
>
> Thanks in advance
>
>
> Regards
>
> Javi
>
> On Thu, Jan 13, 2011 at 1:56 PM, Daniel-Constantin Mierla <
> miconda at gmail.com> wrote:
>
>> Can you send the log messages (debug=3) for that moment (restart of pg
>> server and making a new call/registration)?
>>
>> Daniel
>>
>>
>> On 1/13/11 12:00 PM, Javier Gallart wrote:
>>
>> Hi Daniel
>>
>> I have just tested it and I'm getting the same results. This is the
>> kamailio version I'm testing:
>> root at kam-test:/usr/local/kamailio/sbin# ./kamailio -V
>> version: kamailio 3.2.0-dev2 (x86_64/linux) 35568f
>>
>> Thanks!
>>
>> Javi
>>
>>
>> On Tue, Jan 4, 2011 at 3:46 PM, Javier Gallart <jgallartm at gmail.com>wrote:
>>
>>> Hi list
>>>
>>> we have been testing the mtree module. We do periodical reloads of the
>>> mtree table with the "mi mt_reload" command through xmlrpc. It works fine
>>> except when the db is restarted. If we manually restart the db and then try
>>> the mt_reload commands we get this error:
>>> Jan 4 09:13:17 server /usr/local/kamailio-3.1.1/sbin/kamailio[28534]:
>>> ERROR: db_postgres [km_dbase.c:152]: 0xa6a490 PQsendQuery Error: server
>>> closed the connection unexpectedly#012#011This probably means the server
>>> terminated abnormally#012#011before or while processing the request.#012
>>> Query: select partition,prefix,route from trees order by partition
>>> Jan 4 09:13:17 server /usr/local/kamailio-3.1.1/sbin/kamailio[28534]:
>>> ERROR: <core> [db_query.c:101]: error while submitting query
>>> Jan 4 09:13:17 server /usr/local/kamailio-3.1.1/sbin/kamailio[28534]:
>>> ERROR: mtree [mtree_mod.c:622]: Error while querying db
>>> Jan 4 09:13:17 server /usr/local/kamailio-3.1.1/sbin/kamailio[28534]:
>>> ERROR: mtree [mtree_mod.c:738]: cannot re-load info from database
>>>
>>> Is there a way to reconnect to the db before sending that command?
>>>
>>> Thanks in advance
>>>
>>> Regards
>>>
>>> Javi
>>>
>>>
>>
>> _______________________________________________
>> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>>
>>
>> --
>> Daniel-Constantin Mierla
>> Kamailio (OpenSER) Advanced Training
>> Jan 24-26, 2011, Irvine, CA, USAhttp://www.asipto.com
>>
>>
>
> _______________________________________________
> SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing listsr-users at lists.sip-router.orghttp://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
>
>
> --
> Daniel-Constantin Mierla
> Kamailio (OpenSER) Advanced Training
> Jan 24-26, 2011, Irvine, CA, USAhttp://www.asipto.com
>
>
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