Hi
This happens on INSERT and UPDATE queries since today i had
[2022/11/04 12:05:53 +0100] poller.php(3430): Failed dbQuery (#1205 - Lock wait timeout exceeded; try restarting transaction), Query: UPDATE `vlans_fdb` set `fdb_last_change` ='1667559900',`deleted` ='1' WHERE `fdb_id` IN ('20...... <lots of output in the log>
I just migrated from MySQL 5.7 to MariaDB 10.9 but this didn't
solve the issue
Best,
Thomas
This seems to be an issue with the number of updates we do on large vlan installations. It's not entirely clear to me why it's happening, so not really sure how to fix it.
MySQL behaves oddly at times. We do an insert with a clause to update when primary key exists, which might well be why it's behaving oddly. I think if we tried to remove that and do it another way, it would be much slower.
I saw some solutions involving query ordering, but I couldn't see how that would affect us.
I wonder if this happens only when both an insert and an update occur on the same query?
adam.
Milton Ngan via observium wrote on 2022-10-28 10:03:
Try out some of the diagnostic steps here. Is it always the vlans_fdb table? You can probably turn off polling that data for now so polling keeps working.
https://dev.mysql.com/doc/refman/5.6/en/innodb-deadlocks-handling.html
At any time, issue
SHOW ENGINE INNODB STATUSto determine the cause of the most recent deadlock. That can help you to tune your application to avoid deadlocks.If frequent deadlock warnings cause concern, collect more extensive debugging information by enabling the
innodb_print_all_deadlocksvariable. Information about each deadlock, not just the latest one, is recorded in the MySQL error log. Disable this option when you are finished debugging.
From: Thomas Stather via observium <observium@lists.observium.org>
Sent: Friday, October 28, 2022 12:53:01 AM
To: observium@observium.org
Cc: Adam Armstrong; Thomas Stather
Subject: [Observium] Re: Lots of errors "Deadlock found when trying to getHi
We have
207 devices (network, servers, ups etc.)
6709 ports
2841 sensors
The problem is still not fixed.
Best,
Thomas
Am 26.07.2022 um 23:49 schrieb Adam Armstrong via observium:
> You might want to provide information on how big the installation is and what sort of devices are involved.
>
> But I'd try upgrading to a newer distribution. Newer MySQL/MariaDB may behave better.
>
> Adam.
>
> -----Original Message-----
> From: observium <observium-bounces@observium.org> On Behalf Of Thomas Stather via observium
> Sent: 26 July 2022 08:42
> To: 'Observium' <observium@observium.org>
> Cc: Thomas Stather <tstather@mr.mpg.de>
> Subject: [Observium] Lots of errors "Deadlock found when trying to get lock; try restarting transaction"
>
> Hi
>
> We are running Observium Professional r12071
>
> OS: Ubuntu 18.04 LTS
>
> MySQL: 5.7.38-0ubuntu0.18.04.1
>
>
> In our /opt/observium/logs/db log, we are seeing a lot of these messages (approx. every minute).
>
> ---
>
> [2022/07/26 09:23:54 +0200] poller.php(3889): Failed dbQuery (#1213 - Deadlock found when trying to get lock; try restarting transaction),
> Query: INSERT INTO `vlans_fdb`
> (`fdb_id`,`port_id`,`fdb_status`,`fdb_port`,`fdb_last_change`,`deleted`)
> VALUES
> 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> ON DUPLICATE KEY UPDATE
> `fdb_id`=VALUES(`fdb_id`),`port_id`=VALUES(`port_id`),`fdb_status`=VALUES(`fdb_status`),`fdb_port`=VALUES(`fdb_port`),`fdb_last_change`=VALUES(`fdb_last_change`),`deleted`=VALUES(`deleted`)
>
> ---
>
>
> Does somebody have a clue how this can be fixed?
>
> Best,
>
> Thomas
>
> --
> Thomas Stather
> IT Services
>
> VCP4, VCP6-DCV, VCP6.5-DCV
>
> Tel: +49 6221 486 628
> Fax: +49 6221 486 561
>
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>
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--
Thomas Stather
IT Services
VCP4, VCP6-DCV, VCP6.5-DCV
Room: U1.509
Tel: +49 6221 486 628
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Bevor Sie diese Mail ausdrucken, prüfen Sie bitte ob dies wirklich nötig ist. Umweltschutz geht uns alle an!
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-- Thomas Stather IT Services VCP4, VCP6-DCV, VCP6.5-DCV Room: U1.509 Tel: +49 6221 486 628 Fax: +49 6221 486 561 Bevor Sie diese Mail ausdrucken, prüfen Sie bitte ob dies wirklich nötig ist. Umweltschutz geht uns alle an!