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Make "write both, read old" the default MCR migration stage on master / for CI
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We want to enable MCR in forward-compatible mode for use in CI and on development systems.

The new default should be:
$wgMultiContentRevisionSchemaMigrationStage = SCHEMA_COMPAT_WRITE_BOTH | SCHEMA_COMPAT_READ_OLD;

NOTE: this is tracked as an MCR Deployment task because it blocks schema deployment. It's not itself a deployment task.
NOTE: this should NOT be release. 1.32 should instead have "write both, read new" as the default, see T198561

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Event Timeline

daniel triaged this task as Medium priority.Jul 1 2018, 12:53 PM
daniel created this task.
Aklapper changed the edit policy from "Custom Policy" to "All Users".Jul 9 2018, 7:40 AM

Change 446065 had a related patch set uploaded (by Anomie; owner: Anomie):
[mediawiki/core@master] Set default wgMultiContentRevisionSchemaMigrationStage to write-both

Change 446065 merged by jenkins-bot:
[mediawiki/core@master] Set default wgMultiContentRevisionSchemaMigrationStage to write-both

Change 425519 abandoned by Daniel Kinzler:
[MCR] [DNM] Set MCR migration stage to write-both/read-old.