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Set the WMF cluster to use the new MCR-only schema
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Description

The following setting fully switches MediaWiki to the new, MCR enabled database schema for revision storage:

$wgMultiContentRevisionSchemaMigrationStage = SCHEMA_COMPAT_NEW;

This renders the following database fields unused:

  • revision.rev_text_id
  • revision.rev_content_model
  • revision.rev_content_format
  • archive.ar_text_id
  • archive.ar_content_model
  • archive.ar_content_format
WARNING: This marks the POINT OF NO RETURN for MCR deployment to the WMF cluster! Rolling this back would render all content of new revisions inaccessible!
WARNING: Because of cross-wiki revision access, this can only be done an ANY system on the cluster once ALL systems on the cluster write the new schema.

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Event Timeline

daniel triaged this task as Normal priority.Jun 27 2018, 11:34 AM
daniel created this task.
daniel renamed this task from Enable new MCR storage schemas on live systems to Set the WMF cluster to use the new MCR-only schema.Jul 1 2018, 12:21 PM
daniel updated the task description. (Show Details)Jul 2 2018, 2:41 PM
daniel updated the task description. (Show Details)Jul 8 2018, 8:17 PM
Nirmos added a subscriber: Nirmos.Feb 8 2019, 8:50 PM
greg added a project: Multimedia.Mar 7 2019, 10:59 PM
Restricted Application added a project: Multimedia. · View Herald TranscriptMar 15 2019, 5:59 PM
WDoranWMF moved this task from MCR to mop on the Core Platform Team board.Fri, Jul 26, 6:39 PM