It’s not that tiny, this article is a bit old, but still valid: https://www.percona.com/blog/2008/11/21/how-to-calculate-a-good-innodb-log-f... If you don’t need a big redo log, reduce its side to avoid slow crash recovery
Le 27 juil. 2022 à 15:23, Gordan Bobic <gordan.bobic@gmail.com> a écrit :
10.5+ only uses a single log file, so that is 1x1GB. And 1GB is tiny, IMO it should be a default these days. I would only even consider something smaller if I was running on an older Raspberry Pi or something similarly constrained.
On Wed, Jul 27, 2022 at 4:11 PM jocelyn fournier <jocelyn.fournier@gmail.com> wrote:
Hi Cédric!
Just to be sure, do you really need the 2x 1G log_file_size ?
BR, Jocelyn Fournier
Le 27 juil. 2022 à 14:36, Cédric Counotte <cedric.counotte@1check.com> a écrit :
Reading this: https://jira.mariadb.org/browse/MDEV-27295
It's quite unclear when it is fixed or reverted.
That said I read that the following setting might fix it: SET GLOBAL innodb_max_dirty_pages_pct_lwm=0.001;
Is that correct and should I try that and see if that helps?
-----Message d'origine----- De : Gordan Bobic <gordan.bobic@gmail.com> Envoyé : mercredi 27 juillet 2022 14:29 À : Marko Mäkelä <marko.makela@mariadb.com> Cc : Cédric Counotte <cedric.counotte@1check.com>; Mailing-List mariadb <maria-discuss@lists.launchpad.net> Objet : Re: [Maria-discuss] MariaDB server horribly slow on start
On Wed, Jul 27, 2022 at 3:08 PM Marko Mäkelä <marko.makela@mariadb.com> wrote:
On Wed, Jul 27, 2022 at 2:48 PM Gordan Bobic <gordan.bobic@gmail.com> wrote:
There is no supported downgrade path other than logical dump+restore. There are also no packages built for distros where the major version is older than what ships with the distro.
Since your queries seem to end up stuck in commit stage, it could be related to redo log flushing, which behaves very erratically on 10.5+. If it leaves the log to fill up to 90% and the state transfer hits, it could be that with the checkpoint age already high, there just isn't enough headroom to avoid a massive stall. Purely guessing here without any telemetry.
I think that you may refer to InnoDB page flushing. There was some misunderstanding around that, and indeed some partly unintended or uninformed changes in behaviour (in 10.5.7 and 10.5.8) that were reverted later. It could be useful to read https://jira.mariadb.org/browse/MDEV-27295.
What version was it reverted in? I am still seeing the errant redo log flushing behaviour in 10.5.15. It looks like no flushing happens until the hwm is reached at about 85% full. It then tries to commit everything down to the lwm. And inbetween it doesn't do anything, even while everything is idle and it should be running down the _______________________________________________ Mailing list: https://launchpad.net/~maria-discuss Post to : maria-discuss@lists.launchpad.net Unsubscribe : https://launchpad.net/~maria-discuss More help : https://help.launchpad.net/ListHelp