Perhaps you can use one of the file_summary_*/other tables in the performance_schema to identify the query causing this?

R

-----Original Message-----
From: Maria-discuss <maria-discuss-bounces+rhys.campbell=swisscom.com@lists.launchpad.net> On Behalf Of Sergei Golubchik
Sent: 07 August 2019 13:42
To: Kevin DG <kevin@dubourg.info>
Cc: maria-discuss@lists.launchpad.net
Subject: Re: [Maria-discuss] Disk increase with MAD and MAI extension files in tmp dir

Hi, Kevin!

When did it start?

Did you, for example, upgrade from 10.3.13 to 10.3.14 and then noticed it? (I'm not saying this is a known bug in 10.3.14, it was just an example)

What filesystem is it?

And, don't forget, if it looks like a bug to you, report it at jira.mariadb.org to get it fixed

On Aug 07, Kevin DG wrote:
> Hello all,
>
> MariaDB version -> 10.3.14
>
> Recently, we had a new problem with our MariaDB instance. Indeed,
> suddenly the size of the tmp directory has increased almost
> instantaneously, to finish saturating the disk.
>
> We have encountered this problem twice and don't understand currently
> the problem origin.
>
> The result of 'ls -l /tmp' during the problem:
>
> mysql@16c212e7dbb5:/tmp# ls -l
> total 126786988
> -rw-rw---- 1 mysql mysql 14190428160 Jul  8 15:18 '#sql_1_1.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:02 '#sql_1_1.MAI'
> -rw-rw---- 1 mysql mysql 13344178176 Jul  8 15:18 '#sql_1_11.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:02 '#sql_1_11.MAI'
> -rw-rw---- 1 mysql mysql 13344546816 Jul  8 15:18 '#sql_1_14.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:02 '#sql_1_14.MAI'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:18 '#sql_1_2.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:18 '#sql_1_2.MAI'
> -rw-rw---- 1 mysql mysql 12613459968 Jul  8 15:20 '#sql_1_25.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:03 '#sql_1_25.MAI'
> -rw-rw---- 1 mysql mysql 12221440000 Jul  8 15:20 '#sql_1_26.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:03 '#sql_1_26.MAI'
> -rw-rw---- 1 mysql mysql 12220719104 Jul  8 15:20 '#sql_1_29.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:03 '#sql_1_29.MAI'
> -rw-rw---- 1 mysql mysql 12220907520 Jul  8 15:20 '#sql_1_36.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:03 '#sql_1_36.MAI'
> -rw-rw---- 1 mysql mysql 14190247936 Jul  8 15:18 '#sql_1_4.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:02 '#sql_1_4.MAI'
> -rw-rw---- 1 mysql mysql 12220588032 Jul  8 15:18 '#sql_1_47.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:03 '#sql_1_47.MAI'
> -rw-rw---- 1 mysql mysql 13350912000 Jul  8 15:18 '#sql_1_6.MAD'
> -rw-rw---- 1 mysql mysql        8192 Jul  8 15:02 '#sql_1_6.MAI'
>
>
> We failed to identify the origin of this behaviour.
>
> Does anyone know what can trigger this behavior ? We also failed to
> find a configuration paramater to avoid and limit the size of these
> files, any ideas about that ?
>
> Thanks for your help,

Regards,
Sergei
VP of MariaDB Server Engineering
and security@mariadb.org

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