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Enable MCR migration stage "write both, read new" on testwiki
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To try out the new, MCR enabled database schema, we want this setting on testwiki:

$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.
We could also do this on a testwiki dedicated to commons, see T197616: Create a production test wiki in group0 to parallel Wikimedia Commons.

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

Event Timeline

Note that T183488 needs to be completed before this can proceed, unless we're sure testwiki doesn't try to read revisions from any other wiki's DB.

Change 454534 had a related patch set uploaded (by Daniel Kinzler; owner: Daniel Kinzler):
[operations/mediawiki-config@master] Set MCR migration to read-both/read-new on testwiki.

Change 454534 merged by jenkins-bot:
[operations/mediawiki-config@master] Set MCR migration to write-both/read-new on testwiki.

Mentioned in SAL (#wikimedia-operations) [2018-09-20T15:56:20Z] <anomie@deploy1001> Synchronized wmf-config/InitialiseSettings.php: Setting MCR migration stage to write-both/read-new on testwiki (T198309) (duration: 00m 59s)

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