[Wikitech-l] [Wikidata-tech] Normalization of change tag schema

Discussion:

Amir Sarabadani

2018-07-25 17:17:31 UTC

Hello,
One update regarding this.
We enabled using the new table for Special:Tags in several large wikis
which caused a massive improvement in the performance of the page. For
example loading Special:Tags on Wikidata used to take around a minute and
now it takes less than a second. English Wikipedia is down from ten seconds
to less than one and so on.

There is a lot of work needs to be done and maintenance scripts is being
ran to backpopulate the ct_tag_id column in change_tag table (If you want
to follow the progress, see https://phabricator.wikimedia.org/T193873) and
then we need start reading from the new table in mediawiki and finally we
can drop ct_tag column entirely. If you want to help in review, writing
code or anything, just let me know.

Best

Hello all,
Our team is refactoring some code around the change tags on Recent
Changes. This can impact people using the database on ToolForge.
Currently, the tags are stored in the table change_tag in the column
ct_tag.
In the next days, we will add a column ct_tag_id with a unique identifier
for these tags. A new table change_tag_def that will store the tag id,
the message, and more information like how many times this tag is used on
the local wiki.
On the long term, we plan to drop the column ct_tag since the tag will be
identified with ct_tag_id.
- French Wikipedia: Monday July 2nd
- All other wikis: from July 9th
If there is any problem (trouble with saving edits, slow down of recent
changes…) please create a subtask of T185355
<https://phabricator.wikimedia.org/T185355> or contact Ladsgroup
<https://www.wikidata.org/wiki/User:Ladsgroup>.
Cheers,
--
Léa Lacroix
Project Manager Community Communication for Wikidata
Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin
www.wikimedia.de
Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg
unter der Nummer 23855 Nz. Als gemeinnützig anerkannt durch das Finanzamt
für Körperschaften I Berlin, Steuernummer 27/029/42207.
_______________________________________________
Wikidata-tech mailing list
https://lists.wikimedia.org/mailman/listinfo/wikidata-tech

--
Amir Sarabadani
Software Engineer

Wikimedia Deutschland e. V. | Tempelhofer Ufer 23-24 | 10963 Berlin
Tel. (030) 219 158 26-0
http://wikimedia.de

Stellen Sie sich eine Welt vor, in der jeder Mensch an der Menge allen
Wissens frei teilhaben kann. Helfen Sie uns dabei!
http://spenden.wikimedia.de/

Wikimedia Deutschland – Gesellschaft zur Förderung Freien Wissens e. V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter
der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für
Körperschaften I Berlin, Steuernummer 27/029/42207.

Amir Sarabadani

2018-07-30 11:13:11 UTC

Permalink

Hey,
Using the new table as backend of Special:Tags (and similar APIs) is now
enabled everywhere. Contact me if there's any issues with that.

Best

Post by Amir Sarabadani
Hello,
One update regarding this.
We enabled using the new table for Special:Tags in several large wikis
which caused a massive improvement in the performance of the page. For
example loading Special:Tags on Wikidata used to take around a minute and
now it takes less than a second. English Wikipedia is down from ten seconds
to less than one and so on.
There is a lot of work needs to be done and maintenance scripts is being
ran to backpopulate the ct_tag_id column in change_tag table (If you want
to follow the progress, see https://phabricator.wikimedia.org/T193873)
and then we need start reading from the new table in mediawiki and finally
we can drop ct_tag column entirely. If you want to help in review, writing
code or anything, just let me know.
Best

Hello all,
Our team is refactoring some code around the change tags on Recent
Changes. This can impact people using the database on ToolForge.
Currently, the tags are stored in the table change_tag in the column
ct_tag.
In the next days, we will add a column ct_tag_id with a unique
identifier for these tags. A new table change_tag_def that will store
the tag id, the message, and more information like how many times this tag
is used on the local wiki.
On the long term, we plan to drop the column ct_tag since the tag will
be identified with ct_tag_id.
- French Wikipedia: Monday July 2nd
- All other wikis: from July 9th
If there is any problem (trouble with saving edits, slow down of recent
changes…) please create a subtask of T185355
<https://phabricator.wikimedia.org/T185355> or contact Ladsgroup
<https://www.wikidata.org/wiki/User:Ladsgroup>.
Cheers,
--
Léa Lacroix
Project Manager Community Communication for Wikidata
Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin
www.wikimedia.de
Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg
unter der Nummer 23855 Nz. Als gemeinnützig anerkannt durch das Finanzamt
für Körperschaften I Berlin, Steuernummer 27/029/42207.
_______________________________________________
Wikidata-tech mailing list
https://lists.wikimedia.org/mailman/listinfo/wikidata-tech

--
Amir Sarabadani
Software Engineer
Wikimedia Deutschland e. V. | Tempelhofer Ufer 23-24 | 10963 Berlin
Tel. (030) 219 158 26-0
http://wikimedia.de
Stellen Sie sich eine Welt vor, in der jeder Mensch an der Menge allen
Wissens frei teilhaben kann. Helfen Sie uns dabei!
http://spenden.wikimedia.de/
Wikimedia Deutschland – Gesellschaft zur Förderung Freien Wissens e. V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter
der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für
Körperschaften I Berlin, Steuernummer 27/029/42207.

Amir Sarabadani

2018-07-30 16:21:36 UTC

Permalink

And this is the load on vslow database nodes on s7:
https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1532794373712&to=1532967173714&var-dc=eqiad%20prometheus%2Fops&var-server=db1090&var-port=13317

You can see similar drops on other sections from exactly the moment it got
deployed:
s1:
https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1531757700702&to=1532967300702&var-dc=eqiad%20prometheus%2Fops&var-server=db1106&var-port=9104
s2:
https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1532794561870&to=1532967361872&var-dc=eqiad%20prometheus%2Fops&var-server=db1090&var-port=13312

Best

Post by Amir Sarabadani
Hey,
Using the new table as backend of Special:Tags (and similar APIs) is now
enabled everywhere. Contact me if there's any issues with that.
Best
On Wed, 25 Jul 2018 at 19:17, Amir Sarabadani <

Hello all,
Our team is refactoring some code around the change tags on Recent
Changes. This can impact people using the database on ToolForge.
Currently, the tags are stored in the table change_tag in the column
ct_tag.
In the next days, we will add a column ct_tag_id with a unique
identifier for these tags. A new table change_tag_def that will store
the tag id, the message, and more information like how many times this tag
is used on the local wiki.
On the long term, we plan to drop the column ct_tag since the tag will
be identified with ct_tag_id.
- French Wikipedia: Monday July 2nd
- All other wikis: from July 9th
If there is any problem (trouble with saving edits, slow down of recent
changes…) please create a subtask of T185355
<https://phabricator.wikimedia.org/T185355> or contact Ladsgroup
<https://www.wikidata.org/wiki/User:Ladsgroup>.
Cheers,
--
Léa Lacroix
Project Manager Community Communication for Wikidata
Wikimedia Deutschland e.V.
Tempelhofer Ufer 23-24
10963 Berlin
www.wikimedia.de
Wikimedia Deutschland - Gesellschaft zur Förderung Freien Wissens e. V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg
unter der Nummer 23855 Nz. Als gemeinnützig anerkannt durch das Finanzamt
für Körperschaften I Berlin, Steuernummer 27/029/42207.
_______________________________________________
Wikidata-tech mailing list
https://lists.wikimedia.org/mailman/listinfo/wikidata-tech

--
Amir Sarabadani
Software Engineer
Wikimedia Deutschland e. V. | Tempelhofer Ufer 23-24 | 10963 Berlin
Tel. (030) 219 158 26-0
http://wikimedia.de
Stellen Sie sich eine Welt vor, in der jeder Mensch an der Menge allen
Wissens frei teilhaben kann. Helfen Sie uns dabei!
http://spenden.wikimedia.de/
Wikimedia Deutschland – Gesellschaft zur Förderung Freien Wissens e. V.
Eingetragen im Vereinsregister des Amtsgerichts Berlin-Charlottenburg unter
der Nummer 23855 B. Als gemeinnützig anerkannt durch das Finanzamt für
Körperschaften I Berlin, Steuernummer 27/029/42207.

Jaime Crespo

2018-07-30 16:46:49 UTC

Permalink

Awesome news, Amir,

You made some function calls one million times faster, making contributors
happier and making available resources that can now be used for other
mission-related tasks. That also made, at least, WMF DBAs very happy!

Cheers,

On Mon, Jul 30, 2018 at 6:22 PM Amir Sarabadani <

Post by Amir Sarabadani
https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1532794373712&to=1532967173714&var-dc=eqiad%20prometheus%2Fops&var-server=db1090&var-port=13317
You can see similar drops on other sections from exactly the moment it got
https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1531757700702&to=1532967300702&var-dc=eqiad%20prometheus%2Fops&var-server=db1106&var-port=9104
s2
<https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1531757700702&to=1532967300702&var-dc=eqiad%20prometheus%2Fops&var-server=db1106&var-port=9104s2>
https://grafana.wikimedia.org/dashboard/db/mysql?panelId=3&fullscreen&orgId=1&from=1532794561870&to=1532967361872&var-dc=eqiad%20prometheus%2Fops&var-server=db1090&var-port=13312
Best
On Mon, 30 Jul 2018 at 13:13, Amir Sarabadani <

and