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Maniphest T398709

FY2025-26 WE 6.4.1: Move links tables of commons to a dedicated cluster
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Zabe
Authored By
Ladsgroup
Jul 4 2025, 12:04 PM
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Description

This is part of annual plan for FY 25-26. Commons database has grown to an extremely large size (2TB) and we have no choice but to split it. The most cost-benefit efficient way is to move the links tables to a dedicated cluster (x4) which would cut its size to half.

These tables must be moved to x4:

  • linktarget
  • externallinks
  • pagelinks
  • templatelinks
  • categorylinks
  • collation
  • imagelinks
  • globalimagelinks
  • iwlinks
  • existencelinks
  • langlinks

This can be done via introducing a new core virtual domain (virtual-links) and then migrating queries. Any query that join with page or other tables must be split to be two queries hitting different connections and if not possible, it should be done in a different way (e.g. T309738: Move MediaWiki QueryPages computation to Hadoop) or gets disabled in commons.

We need to set up back ups and wikireplicas too.

For now, we should assume page and redirect tables will exist in both databases. Depending on how many cases directly join and not easy to split, we could consider having those tables being shared.

Details

Other Assignee
Ladsgroup
Related Changes in Gerrit:
SubjectAuthorRepoBranchLines +/-
Move testcommonswiki links tables to x4Ladsgroupoperations/mediawiki-configmaster+4 -11
Simplify checks if link tables use virtual domainsZabemediawiki/coremaster+12 -23
Deferred: Fix function to get virtual domainLadsgroupmediawiki/corewmf/1.46.0-wmf.22+7 -2
Deferred: Fix function to get virtual domainLadsgroupmediawiki/corewmf/1.46.0-wmf.21+7 -2
Deferred: Fix function to get virtual domainLadsgroupmediawiki/coremaster+7 -2
Customize query in gerrit

Related Objects
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StatusSubtypeAssignedTask
 ResolvedLadsgroupT343131 Commons database is growing way too fast
 ResolvedZabeT398709 FY2025-26 WE 6.4.1: Move links tables of commons to a dedicated cluster
 ResolvedLadsgroupT398829 Migrate queries of externallinks to virtual-links
 ResolvedZabeT400824 Prepare globalimagelinks for s4 split
 ResolvedZabeT400169 Convert GlobalUsage to virtual domains
 ResolvedZabeT400883 Migrate queries of templatelinks to virtual domain
 ResolvedZabeT402354 Migrate queries of imagelinks to virtual-links
ResolvedZabeT404711 Migrate existencelinks to virtual domain
 ResolvedZabeT405809 Migrate iwlinks to virtual domains
 ResolvedZabeT405811 Migrate pagelinks to virtual domain
 ResolvedZabeT405812 Migrate categorylinks to virtual domain
 ResolvedBUG REPORTZabeT419563 Missing "continue" element for categories prop when clshow set
 ResolvedBUG REPORTFuncT439315 updateCollation: Wikimedia\Rdbms\DBQueryError: no such table: linkscategorylinks
 ResolvedLadsgroupT408137 Build a write duplicator system in mediawiki core
 OpenZabeT309738 Move MediaWiki QueryPages computation to Hadoop
 ResolvedPRODUCTION ERROR• Scott_FrenchT408530 MediaWiki periodic job update-special-pages-s3 failed
 ResolvedZabeT413362 Move Mostcategories computation to Hadoop
 ResolvedZabeT414202 Disable GloballyUnusedFiles special page on commons
 ResolvedZabeT371662 Disable LonelyPages and Deadendpages on commons
 ResolvedZabeT416927 Move MostTranscludedPages computation to Hadoop for commonswiki
 ResolvedZabeT422443 Move SpecialUnusedTemplates computation to Hadoop
 OpenZabeT422444 Move SpecialUnusedImages computation to Hadoop
 OpenZabeT422445 Move SpecialWantedFiles computation to Hadoop
 DuplicateZabeT422446 Move SpecialLonelyPages computation to Hadoop
 OpenZabeT422447 Move SpecialDisambiguationPageLinks computation to Hadoop
 OpenZabeT422448 Move SpecialUnusedCategories computation to Hadoop
 OpenZabeT422449 Move SpecialUncategorizedImages computation to Hadoop
 DeclinedZabeT422450 Move SpecialWantedCategories computation to Hadoop
 OpenZabeT422894 Move GloballyWantedFiles computation to Hadoop
 ResolvedPRODUCTION ERRORZabeT408801 Expectation (readQueryRows <= 10000) by MediaWiki\Actions\ActionEntryPoint::execute not met (caused by RestrictionStore)
 ResolvedZabeT411577 Make ChangesListQuery compatible with commons split
 ResolvedLadsgroupT421914 Test links virtual domain split on testcommonswiki
 ResolvedZabeT422519 Migrate langlinks to virtual domain
 ResolvedZabeT422940 Figure out how to handle virtual domains on foreign wikis
 ResolvedAhoelzlT431476 Data Lake - sqoop of commons link tables needs to adapt to move to dedicated MariaDB cluster
 ResolvedZabeT437108 Move production reads for commons link tables to x4
 ResolvedNoneT437111 Split production writes for commons link tables
 ResolvedMarosteguiT404715 Setup x4 section
 ResolvedMarosteguiT406550 Productionize db126[0-3]
 ResolvedMarosteguiT406551 Productionize db224[5-8]
 OpenNoneT431984 dbctl instance edit crashes with "exceptions must derive from BaseException" instead of showing real validation errors
 ResolvedPRODUCTION ERRORZabeT431989 PHP Warning: Undefined array key "x4"
 ResolvedtaaviT437208 Update user-facing Wiki Replicas features and documentation for x4
 ResolvedtaaviT409560 Add support for x1 and x4 sections on wiki replicas on the load balancer layer
 ResolvedMarosteguiT437229 Check cookbooks/scripts to add x4
 ResolvedMarosteguiT437279 Setup x4 backups
 ResolvedMarosteguiT437678 Create x4 candidate masters
 InvalidNoneT437696 Switchover x4 master (db2248 -> db2245)
 InvalidNoneT437695 Switchover x4 master (db1263 -> db1261)
 ResolvedMarosteguiT437838 Add x4 to an-redacteddb1001
 ResolvedMarosteguiT437839 Add x4 to dbstore1007
 ResolvedPRODUCTION ERRORZabeT437286 Wikimedia\Rdbms\DBQueryError: Error 1146: Table 'commonswiki.category' doesn't existFunction: MediaWiki\Specials\SpecialWantedCategories::preprocessResultsQuery: SELECT cat_title,cat_pages FROM `category` WHERE cat_title
 OpenLadsgroupT437278 Drop unneeded tables from x4 and s4
 ResolvedMarosteguiT431309 Setup x4 on sanitarium hosts

Event Timeline

There are a very large number of changes, so older changes are hidden. Show Older Changes
Zabe closed subtask T405809: Migrate iwlinks to virtual domains as Resolved.Sep 28 2025, 4:12 PM
Novem_Linguae subscribed.Oct 1 2025, 5:58 PM
Msz2001 subscribed.Oct 6 2025, 7:08 AM
Zabe reopened subtask T400883: Migrate queries of templatelinks to virtual domain as Open.Oct 11 2025, 3:04 PM
ReaperDawn subscribed.Oct 20 2025, 7:58 AM
TheDJ subscribed.Oct 21 2025, 2:17 PM

Doesn't this require communication towards the community similar to how the x3 change was announced for the Wikidata terms tables ?

Ladsgroup added a comment.Oct 21 2025, 2:54 PM
In T398709#11293949, @TheDJ wrote:

Doesn't this require communication towards the community similar to how the x3 change was announced for the Wikidata terms tables ?

Yup but we are at least several months away from the split actually happening. There are a lot of complex issues that need to be solved e.g. how to replicate the page table from s4 to x4 (and the consolidation mechanism) and so on.

Wellverywell subscribed.Oct 21 2025, 6:35 PM
Marostegui changed the status of subtask T404715: Setup x4 section from Open to Stalled.Oct 22 2025, 11:38 AM
Marostegui mentioned this in T401295: Decide how to use the new clouddb hosts (clouddb102[2-5]).Oct 22 2025, 1:14 PM
Ladsgroup added a subtask: T408137: Build a write duplicator system in mediawiki core.Oct 23 2025, 4:06 PM
Krinkle subscribed.Oct 24 2025, 7:21 PM

I noticed in a few commits that there is not just virtual-links but also a more narrow virtual-categorylinks. Is there more detail somehere on how that is meant to work exactly? The current plan describes a dedicated cluster for the link tables, which is easy to reason about and there's the task listing which tables are available to query/join there (with page+redirect earmarked as special TBD).

A domain like virtual-categorylinks suggests more decoupling, but I couldn't find any discussion or docs on what it is meant to be used for or what tables one we assume to exist there? Some of the queries using this join against linktarget, for example.

Ladsgroup added a comment.Oct 29 2025, 12:10 AM
In T398709#11308044, @Krinkle wrote:

I noticed in a few commits that there is not just virtual-links but also a more narrow virtual-categorylinks. Is there more detail somehere on how that is meant to work exactly? The current plan describes a dedicated cluster for the link tables, which is easy to reason about and there's the task listing which tables are available to query/join there (with page+redirect earmarked as special TBD).

A domain like virtual-categorylinks suggests more decoupling, but I couldn't find any discussion or docs on what it is meant to be used for or what tables one we assume to exist there? Some of the queries using this join against linktarget, for example.

The idea was to mostly ease the migration of read queries and make sure they are correctly moved (specially for the test setup). Once we are done, all will be consolidated into virtual-links.

Krinkle added a comment.Oct 29 2025, 7:43 AM

Thanks, that makes sense!

Zabe added a subtask: T309738: Move MediaWiki QueryPages computation to Hadoop.Nov 24 2025, 6:29 PM
Zabe added a subtask: T408801: Expectation (readQueryRows <= 10000) by MediaWiki\Actions\ActionEntryPoint::execute not met (caused by RestrictionStore).Nov 30 2025, 11:31 PM
Zabe created subtask T411577: Make ChangesListQuery compatible with commons split.Dec 3 2025, 7:48 AM
Ladsgroup closed subtask T408801: Expectation (readQueryRows <= 10000) by MediaWiki\Actions\ActionEntryPoint::execute not met (caused by RestrictionStore) as Resolved.Dec 3 2025, 2:59 PM
Zabe closed subtask T400883: Migrate queries of templatelinks to virtual domain as Resolved.Dec 9 2025, 9:54 PM
Zabe mentioned this in T309738: Move MediaWiki QueryPages computation to Hadoop.Dec 9 2025, 10:03 PM
Zabe closed subtask T402354: Migrate queries of imagelinks to virtual-links as Resolved.Dec 10 2025, 10:39 AM
Zabe mentioned this in T414202: Disable GloballyUnusedFiles special page on commons.Jan 9 2026, 2:14 PM
dr0ptp4kt subscribed.Jan 24 2026, 2:11 AM
Ahoelzl added a project: Data-Engineering (Q3 FY25/26 January 1st - March 31th).Jan 26 2026, 4:57 PM
Ahoelzl moved this task from Next Up to Urgent on the Data-Engineering (Q3 FY25/26 January 1st - March 31th) board.
Ahoelzl subscribed.
Zabe closed subtask T411577: Make ChangesListQuery compatible with commons split as Resolved.Feb 23 2026, 1:48 PM
Ladsgroup created subtask T421914: Test links virtual domain split on testcommonswiki.Mar 31 2026, 2:51 PM
Jdforrester-WMF subscribed.Mar 31 2026, 3:13 PM
Ladsgroup closed subtask T408137: Build a write duplicator system in mediawiki core as Resolved.Mar 31 2026, 3:42 PM
gerritbot added a comment.Apr 1 2026, 6:18 PM

Change #1266343 had a related patch set uploaded (by Ladsgroup; author: Ladsgroup):

[mediawiki/core@master] Deferred: Fix function to get virtual domain

https://gerrit.wikimedia.org/r/1266343

gerritbot added a project: Patch-For-Review.Apr 1 2026, 6:18 PM
gerritbot added a comment.Apr 1 2026, 7:50 PM

Change #1266343 merged by jenkins-bot:

[mediawiki/core@master] Deferred: Fix function to get virtual domain

https://gerrit.wikimedia.org/r/1266343

ReleaseTaggerBot added a project: MW-1.46-notes (1.46.0-wmf.23; 2026-04-07).Apr 1 2026, 8:00 PM
Maintenance_bot removed a project: Patch-For-Review.Apr 1 2026, 8:31 PM
gerritbot added a comment.Apr 1 2026, 10:09 PM

Change #1266442 had a related patch set uploaded (by Ladsgroup; author: Ladsgroup):

[mediawiki/core@wmf/1.46.0-wmf.21] Deferred: Fix function to get virtual domain

https://gerrit.wikimedia.org/r/1266442

gerritbot added a project: Patch-For-Review.Apr 1 2026, 10:09 PM

Change #1266443 had a related patch set uploaded (by Ladsgroup; author: Ladsgroup):

[mediawiki/core@wmf/1.46.0-wmf.22] Deferred: Fix function to get virtual domain

https://gerrit.wikimedia.org/r/1266443

gerritbot added a comment.Apr 1 2026, 10:24 PM

Change #1266442 merged by jenkins-bot:

[mediawiki/core@wmf/1.46.0-wmf.21] Deferred: Fix function to get virtual domain

https://gerrit.wikimedia.org/r/1266442

gerritbot added a comment.Apr 1 2026, 10:24 PM

Change #1266443 merged by jenkins-bot:

[mediawiki/core@wmf/1.46.0-wmf.22] Deferred: Fix function to get virtual domain

https://gerrit.wikimedia.org/r/1266443

Stashbot mentioned this in T421914: Test links virtual domain split on testcommonswiki.Apr 1 2026, 10:27 PM

Mentioned in SAL (#wikimedia-operations) [2026-04-01T22:27:32Z] Started scap sync-world: Backport for [[gerrit:1266443|Deferred: Fix function to get virtual domain (T421914 T398709)]], [[gerrit:1266442|Deferred: Fix function to get virtual domain (T421914 T398709)]]

Stashbot added a comment.Apr 1 2026, 10:29 PM

Mentioned in SAL (#wikimedia-operations) [2026-04-01T22:29:29Z] ladsgroup: Backport for [[gerrit:1266443|Deferred: Fix function to get virtual domain (T421914 T398709)]], [[gerrit:1266442|Deferred: Fix function to get virtual domain (T421914 T398709)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Maintenance_bot removed a project: Patch-For-Review.Apr 1 2026, 10:30 PM
Stashbot added a comment.Apr 1 2026, 10:34 PM

Mentioned in SAL (#wikimedia-operations) [2026-04-01T22:34:08Z] Finished scap sync-world: Backport for [[gerrit:1266443|Deferred: Fix function to get virtual domain (T421914 T398709)]], [[gerrit:1266442|Deferred: Fix function to get virtual domain (T421914 T398709)]] (duration: 06m 37s)

ReleaseTaggerBot edited projects, added: MW-1.46-notes (1.46.0-wmf.22; 2026-03-31); removed: MW-1.46-notes (1.46.0-wmf.23; 2026-04-07).Apr 1 2026, 11:00 PM
Ahoelzl updated Other Assignee, added: Ahoelzl.Apr 3 2026, 5:51 PM
gerritbot added a comment.Apr 3 2026, 9:55 PM

Change #1267967 had a related patch set uploaded (by Zabe; author: Zabe):

[mediawiki/core@master] Simplify checks if link tables use virtual domains

https://gerrit.wikimedia.org/r/1267967

gerritbot added a project: Patch-For-Review.Apr 3 2026, 9:55 PM
Ahoelzl edited projects, added: Data-Engineering (Q4 FS25/26 April 1st - June 30st); removed: Data-Engineering (Q3 FY25/26 January 1st - March 31th).Apr 3 2026, 10:24 PM
Ahoelzl moved this task from Next Up to Urgent on the Data-Engineering (Q4 FS25/26 April 1st - June 30st) board.
gerritbot added a comment.Apr 3 2026, 11:10 PM

Change #1267967 merged by jenkins-bot:

[mediawiki/core@master] Simplify checks if link tables use virtual domains

https://gerrit.wikimedia.org/r/1267967

Maintenance_bot removed a project: Patch-For-Review.Apr 3 2026, 11:31 PM
ReleaseTaggerBot edited projects, added: MW-1.46-notes (1.46.0-wmf.23; 2026-04-07); removed: MW-1.46-notes (1.46.0-wmf.22; 2026-03-31).Apr 4 2026, 12:01 AM
Zabe created subtask T422519: Migrate langlinks to virtual domain.Apr 7 2026, 3:25 PM
Zabe created subtask T422940: Figure out how to handle virtual domains on foreign wikis.Apr 10 2026, 1:46 PM
• jcrespo subscribed.Apr 20 2026, 11:05 AM
Ladsgroup updated the task description. (Show Details)Apr 20 2026, 6:13 PM
Novem_Linguae mentioned this in T423980: add x4 to the MediaWiki replicas.Apr 21 2026, 4:20 AM
Ladsgroup closed subtask T421914: Test links virtual domain split on testcommonswiki as Resolved.Apr 21 2026, 2:50 PM
Zabe closed subtask T405811: Migrate pagelinks to virtual domain as Resolved.Apr 24 2026, 6:06 PM
Marostegui changed the status of subtask T404715: Setup x4 section from Stalled to Open.Jul 1 2026, 11:23 AM
Ottomata created subtask T431476: Data Lake - sqoop of commons link tables needs to adapt to move to dedicated MariaDB cluster.Jul 7 2026, 6:23 PM
Ahoelzl edited projects, added: Data-Engineering (Q1 FS26/27 July 1st - September 30th); removed: Data-Engineering (Q4 FS25/26 April 1st - June 30st).Jul 8 2026, 12:44 PM
Ahoelzl moved this task from Next Up to Urgent on the Data-Engineering (Q1 FS26/27 July 1st - September 30th) board.
Zabe closed subtask T422519: Migrate langlinks to virtual domain as Resolved.Aug 18 2026, 7:10 PM
Zabe created subtask T437108: Move production reads for commons link tables to x4.Sep 4 2026, 9:30 PM
Zabe created subtask T437111: Split production writes for commons link tables.Sep 4 2026, 9:33 PM
Zabe updated Other Assignee, added: Zabe; removed: Ahoelzl.Sep 6 2026, 11:42 AM
Zabe closed subtask T422940: Figure out how to handle virtual domains on foreign wikis as Resolved.Sep 7 2026, 3:55 PM
Zabe closed subtask T405812: Migrate categorylinks to virtual domain as Resolved.
Zabe closed subtask T400824: Prepare globalimagelinks for s4 split as Resolved.Sep 7 2026, 5:55 PM
Zabe closed subtask T437108: Move production reads for commons link tables to x4 as Resolved.Sep 7 2026, 10:08 PM
Marostegui closed subtask T404715: Setup x4 section as Resolved.Sep 8 2026, 9:51 AM
Zabe closed subtask T437111: Split production writes for commons link tables as Resolved.Sep 8 2026, 9:56 AM
Ladsgroup created subtask T437278: Drop unneeded tables from x4 and s4.Sep 8 2026, 11:31 AM
dancy reopened subtask T437108: Move production reads for commons link tables to x4 as Open.Sep 8 2026, 4:18 PM
Zabe closed subtask T437108: Move production reads for commons link tables to x4 as Resolved.Sep 8 2026, 5:11 PM
BrandonXLF subscribed.Sep 9 2026, 2:22 AM
gerritbot added a comment.Sep 9 2026, 10:33 AM

Change #1338142 had a related patch set uploaded (by Ladsgroup; author: Ladsgroup):

[operations/mediawiki-config@master] Move testcommonswiki links tables to x4

https://gerrit.wikimedia.org/r/1338142

gerritbot added a project: Patch-For-Review.Sep 9 2026, 10:33 AM
Ladsgroup closed this task as Resolved.Sep 9 2026, 11:05 PM
Ladsgroup reassigned this task from Ladsgroup to Zabe.
Ladsgroup updated Other Assignee, added: Ladsgroup; removed: Zabe.

There is a lot of clean up and follow ups needed to be done but the main goal of the task which was split the database has been achieved. We have dropped around 1TB from each replica of commons

grafik.png (1,846×928 px, 48 KB)

And this has massively improved performance of these dbs by increasing reads from the memory and reducing reads on disk. It even reduced writes and made binlogs smaller

Some nice graphs:
On-x4 side:
https://grafana.wikimedia.org/d/000000273/mysql?from=2026-09-03T18:52:46.001Z&to=2026-09-09T22:38:01.645Z&timezone=utc&var-job=$__all&var-server=db1261&var-port=9104&refresh=1m&viewPanel=panel-13

grafik.png (1,847×908 px, 171 KB)

https://grafana.wikimedia.org/d/000000377/host-overview?orgId=1&refresh=5m&var-server=db1261&var-datasource=000000026&var-cluster=mysql&from=2026-09-03T17:01:50.280Z&to=2026-09-09T22:39:09.456Z&timezone=utc&viewPanel=panel-35
grafik.png (1,851×941 px, 118 KB)

https://grafana.wikimedia.org/d/000000377/host-overview?orgId=1&refresh=5m&var-server=db1261&var-datasource=000000026&var-cluster=mysql&from=2026-09-03T17:01:50.280Z&to=2026-09-09T22:39:09.456Z&timezone=utc&viewPanel=panel-35
grafik.png (1,852×936 px, 205 KB)

On s4-side:
https://grafana.wikimedia.org/d/000000273/mysql?from=2026-09-03T09:10:51.159Z&to=2026-09-09T22:47:24.454Z&timezone=utc&var-job=$__all&var-server=db1247&var-port=9104&refresh=1m&viewPanel=panel-13

grafik.png (1,843×931 px, 192 KB)

For example, while number of requests have increased (for various reasons):

grafik.png (1,895×932 px, 75 KB)

The reads from disk has gone down:
https://grafana.wikimedia.org/d/000000377/host-overview?orgId=1&refresh=5m&var-server=db1247&var-datasource=000000026&var-cluster=mysql&from=2026-09-04T04:10:15.144Z&to=2026-09-09T22:39:09.456Z&timezone=utc&viewPanel=panel-35
grafik.png (1,864×923 px, 111 KB)

Writes were spikey so I made rolling average of 6 hours (in the past seven days):
grafik.png (1,735×450 px, 43 KB)

Great job @Zabe

Ladsgroup mentioned this in T343131: Commons database is growing way too fast.Sep 9 2026, 11:08 PM
gerritbot added a comment.Sep 9 2026, 11:11 PM

Change #1338142 merged by jenkins-bot:

[operations/mediawiki-config@master] Move testcommonswiki links tables to x4

https://gerrit.wikimedia.org/r/1338142

Stashbot added a comment.Sep 9 2026, 11:11 PM

Mentioned in SAL (#wikimedia-operations) [2026-09-09T23:11:39Z] Started scap sync-world: Backport for [[gerrit:1338142|Move testcommonswiki links tables to x4 (T398709)]]

Stashbot added a comment.Sep 9 2026, 11:15 PM

Mentioned in SAL (#wikimedia-operations) [2026-09-09T23:15:58Z] ladsgroup: Backport for [[gerrit:1338142|Move testcommonswiki links tables to x4 (T398709)]] synced to the testservers (see https://wikitech.wikimedia.org/wiki/Mwdebug). Changes can now be verified there.

Stashbot added a comment.Sep 9 2026, 11:22 PM

Mentioned in SAL (#wikimedia-operations) [2026-09-09T23:22:54Z] Finished scap sync-world: Backport for [[gerrit:1338142|Move testcommonswiki links tables to x4 (T398709)]] (duration: 11m 15s)

Maintenance_bot removed a project: Patch-For-Review.Sep 9 2026, 11:30 PM
Ladsgroup added a comment.Mon, Sep 14, 9:53 AM

The last one was actually on reads in the past six hours (I picked the wrong metric). The write is this, for the past 30 days:

grafik.png (1,715×413 px, 61 KB)

https://grafana-rw.wikimedia.org/goto/ssnmlk?orgId=default

DB111 mentioned this in T438369: The actual content of categories is visible only to registered users.Sun, Sep 20, 1:34 PM
Ahoelzl closed subtask T431476: Data Lake - sqoop of commons link tables needs to adapt to move to dedicated MariaDB cluster as Resolved.Fri, Oct 2, 9:23 PM
Umherirrender mentioned this in T440023: Category file counts display negative page counts.Sat, Oct 3, 8:57 AM
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