One thing which we, as developers of MariaDB, run into is that our personal database needs are not the same as many of our users. In fact, our needs are quite light compared to many. We have a MariaDB website, a company website, a knowledgebase, this blog, and that’s about it. None of them are particularly high traffic compared to what our customers have. But apart from talking to our customers, which are just a small percentage of the total MariaDB population, we wanted to have a way of finding out how MariaDB is used “in the real world”, so to speak.

Asking lots and lots of people to fill out surveys isn’t any fun, and we would have to keep repeating the survey ad nauseum to get useful information over time on trends and such. So many years ago (around 2003 or 2004), we came up with an idea of implementing a “phone home” feature in MySQL. It had an unfortunate fate — everyone agreed that we needed it, but, apparently, there was never a good time for implementing it. And we — in MySQL — kept on developing the features that we supposed you might want, without the statistics that would help us know what you actually needed.

But we can stop guessing now. Let me announce the User Feedback plugin, it’s included in the just-released MariaDB 5.3.2-beta. This plugin is disabled by default, but we hope many of you will enable it. The statistics gathered will help us determine where to focus our development efforts and we think they will prove beneficial, or at least interesting, to everyone else. (What? You thought we were going to keep all of the information to ourselves?)

More information on the plugin can be found at http://kb.askmonty.org/en/user-feedback-plugin and some nice charts will eventually be available for your viewing pleasure at: http://mariadb.org/feedback_plugin/. I say eventually because if you go there now, there’s not much to look at, what with the plugin being just released and all.

The statistics gathered include things like buffer sizes, CPU architecture, OS, kernel version, what plugins are enabled, how much memory is installed, and so on. The statistics are all anonymous and contain no sensitive or private information. The information is collected into the information_schema.feedback table (and if you have the plugin enabled you can see what has been collected with a simple SELECT * FROM information_schema.feedback query). Once enabled, the Feedback plugin will automatically send a report a few minutes after startup and then once a week. Submitting is done via an HTTP POST (just like a web form).

Even if you choose not to submit anonymous statistics to mariadb.org, you may still find the plugin useful, especially if you run many instances of MariaDB. You see, the URL the plugin POSTs to is configurable. The default is to post to mariadb.org, but you can easily change it to POST to your own server, or to your own server and mariadb.org (you can configure multiple URLs).

For paranoid folks out there (and a good DBA should be a little bit paranoid) we have provided many different ways to ensure that the plugin only sends what we say it does — anonymous usage statistics. You can configure multiple report URLs, can see the HTTP traffic with a network sniffer, and can even submit the data manually using a web browser if you so choose.

Full details on configuring the plugin, and how to enable it, are available at http://kb.askmonty.org/en/user-feedback-plugin.

So, if you’ve ever wanted to help out with MariaDB, but just couldn’t think of anything, here’s something that everyone who runs MariaDB can do without breaking a sweat. Help us help you by enabling the User Feedback plugin!

Thanks.

I just updated to Ubuntu 11.10 “Oneiric” on one of my desktops and I ran into an issue with MariaDB.

It’s not an issue with MariaDB itself, more in how the MariaDB “Natty” .deb packages are configured. We haven’t released .deb packages for Ubuntu 11.10 “Oneiric”, but the Natty packages work fine, apart from this one configuration issue (and when we do release “Oneiric” packages, they will work out-of-the-box).

The main problem is that some things have moved around in “Oneiric” and Apparmor doesn’t like the MariaDB “Natty” Apparmor defaults file because it doesn’t account for some of the new destinations. Specifically, /var/run has been moved to /run (a discussion of the rationale behind the move can be found here). Other things have been moved too, but the /var/run to /run move is the one that is causing trouble.

I searched launchpad and found bug #810270 which talks about the move and some of the packages, including MySQL, which needed to be updated. So for the version of MySQL in the official Ubuntu repositories, things are fixed. To fix things on my local machine I took a look at Ubuntu’s MySQL apparmor-profile file and saw four differences between it and my local /etc/apparmor.d/usr.sbin.mysqld file:

  1. /etc/mysql/my.cnf r,” was changed to “/etc/mysql/*.cnf r,
  2. /var/run/mysqld/mysqld.pid w,” was changed to “/{,var/}run/mysqld/mysqld.pid w,
  3. /var/run/mysqld/mysqld.sock w,” was changed to “/{,var/}run/mysqld/mysqld.sock w,
  4. /usr/lib/mysql/plugin/ r,” was added

After making the above changes everything appears to be OK. Official MariaDB .deb packages for Ubuntu 11.10 “Oneiric” are coming, but until they arrive, I can at least continue to use the old MariaDB “Natty” packages.

Let me know in the comments if you’ve run into any other issues trying to run, install, or upgrade the MariaDB “Natty” packages on “Oneiric”. Thanks!

P.S. I don’t think I will ever get used to writing “Oneiric”. It’s just such an awkward word. Whatever happened to ‘i’ before ‘e’ except after ‘c’?

**Update 2 Nov 2011** We’ve updated our MariaDB 5.2.9 packages with a fix for the Oneiric upgrade issue (and we have added real Oneiric packages). What we’ve decided to do is remove the apparmor profile we ship with MariaDB. If you’ve customized your profile like above, when you update to the new version (the only change is to the apparmor profile) you will be prompted to keep your existing profile our use our (empty) profile. It is safe to use our empty profile. If you haven’t customized your profile then the update will remove the old apparmor profile.

Its good to announce that Monty Program will have a presence at Percona Live London (October 24 & 25 2011), and we’re very excited about it. There will be two talks (no tutorials this time around):

  1. Sergei Golubchik will present on Pluggable Authentication in MySQL and MariaDB. I’ve seen Serg give tutorials to this effect, so expect a lot within half an hour!
  2. Colin Charles will present on Why MariaDB? which focuses on what new features are available today in MariaDB and how they benefit users.

Will we see you there? Registrations are still open and we would love to talk to you then.

Monty Program is also proud to be a sponsor of Percona Live London 2011, amongst many of our friends.