[rt-users] MySQL backups of RT 4.4.1 truncated

[Cena, Stephen (ext. 300)]

I had that issue initially, and changed the value to 64MB. It was originally 4MB, then I increased it to 16MB, it's been at 64MB for some time.

# The maximum size of one packet or any generated or intermediate string, or any parameter sent by the
# mysql_stmt_send_long_data() C API function.
#max_allowed_packet=4M
#max_allowed_packet=16M
max_allowed_packet=64M

It's the oddest thing. The backups were working perfectly through most of December. Sometime between the week of Christmas and now it seems to have "blown up". As a work around right now, I've split the backup in two pieces: just attachments, and everything else. That appears to be working but I can't seem to explain why this has happened.

Stephen Cena
Senior Systems Administrator
Quality Vision International, Inc.
Phone: (585) 544-0450 x300
To notify helpdesk: http://helpdesk.ogp.qvii.com or email: hd-general at qvii.com<mailto:hd-general at qvii.com>
To report email issues: postmaster at qvii.com<mailto:postmaster at qvii.com>

From: Thomas Bätzler [mailto:t.baetzler at bringe.com]
Sent: Thursday, January 19, 2017 3:04 AM
To: 'rt-users at lists.bestpractical.com' <rt-users at lists.bestpractical.com>
Cc: Cena, Stephen (ext. 300) <SJC at qvii.com>
Subject: AW: [rt-users] MySQL backups of RT 4.4.1 truncated

Hello Stephen,

just a stab in the dark, but could you please check the value set for "max_allowed_packet" in the mysqldump section of /etc/mysql/my.cnf (or whatever your my.cnf file is named)? If you try to dump mysql objects that are larger than this size, mysqldump will stop; probably with a message like "mysql server has gone away". You can raise that value for mysqldump just by editing that file; no server restart is required.

HTH,
Thomas Bätzler
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Von: rt-users [mailto:rt-users-bounces at lists.bestpractical.com] Im Auftrag von Cena, Stephen (ext. 300)
Gesendet: Mittwoch, 18. Januar 2017 18:23
An: 'rt-users at lists.bestpractical.com' <rt-users at lists.bestpractical.com<mailto:rt-users at lists.bestpractical.com>>
Betreff: Re: [rt-users] MySQL backups of RT 4.4.1 truncated

I just ran a test with the attachments table "ignored", and the backup worked perfectly. As a "sanity check", I also ran mysqlcheck on the schema & no errors were found. Should I split my backup job into two pieces, or is there a better way to get a backup all in one shot?


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Message: 4

Date: Wed, 18 Jan 2017 13:54:57 +0000

From: "Cena, Stephen (ext. 300)" <SJC at qvii.com<mailto:SJC at qvii.com>>

To: "'rt-users at lists.bestpractical.com'"

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Subject: [rt-users] MySQL backups of RT 4.4.1 truncated

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I'm currently running RT 4.4.1 on Ubuntu 14.04 LTS with MySQL 5.6 on Windows Server 2012. Recently, we enabled full-text indexing in native MySQL & everything is great. After doing some work on the server over the weekend, I discovered that the .sql files being generated for the backup are being "truncated" after the attachments table (~18-19GB).  After reviewing your documentation (https://docs.bestpractical.com/rt/4.4.1/backups.html) I realized my mysqldump command was incorrect. I'm working in a lab environment now to see how I can optimize/change my script to more closely match yours. The only thought I have right now is to exclude the data from the AttachmentsIndex as that would get rebuilt on restoration anyways. Is there any other reason that the backup would just "stop" after the attachment table? I apologize if this is beyond the scope of the forums thread.



Thank you in advance!



Stephen Cena

Senior Systems Administrator

Quality Vision International, Inc.

Phone: (585) 544-0450 x300

To notify helpdesk: http://helpdesk.ogp.qvii.com or email: hd-general at qvii.com<mailto:hd-general at qvii.com<mailto:hd-general at qvii.com%3cmailto:hd-general at qvii.com>>

To report email issues: postmaster at qvii.com<mailto:postmaster at qvii.com<mailto:postmaster at qvii.com%3cmailto:postmaster at qvii.com>>

Stephen Cena
Senior Systems Administrator
Quality Vision International, Inc.
Phone: (585) 544-0450 x300
To notify helpdesk: http://helpdesk.ogp.qvii.com or email: hd-general at qvii.com<mailto:hd-general at qvii.com>
To report email issues: postmaster at qvii.com<mailto:postmaster at qvii.com>

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