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Enable MCR migration stage "write both, read new" on commons beta.
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Description

To try out the new, MCR enabled database schema, we should enable the new retrieval code on a beta wiki first:

$wgMultiContentRevisionSchemaMigrationStage = SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_NEW;

This keeps writing to the old schema as well, so we can still easily back out of the migration.
Perhaps commons.wikimedia.beta.wmflabs.org would be a good choice.

NOTE: this requires populateContentTables.php to be run first.

Event Timeline

Change 447639 had a related patch set uploaded (by Anomie; owner: Anomie):
[operations/mediawiki-config@master] Set MCR read-old-write-both on Beta Cluster

https://gerrit.wikimedia.org/r/447639

Change 447640 had a related patch set uploaded (by Anomie; owner: Anomie):
[operations/mediawiki-config@master] Set MCR read-new-write-both on Beta Commons

https://gerrit.wikimedia.org/r/447640

Change 447639 merged by jenkins-bot:
[operations/mediawiki-config@master] Set MCR read-old-write-both on Beta Cluster

https://gerrit.wikimedia.org/r/447639

Change 447640 merged by jenkins-bot:
[operations/mediawiki-config@master] Set MCR read-new-write-both on Beta Commons

https://gerrit.wikimedia.org/r/447640