The performance team are progressively deploying the MediaWiki multi-DC project. This project allows us to make use of servers in the Dallas data center which were previously idle. When the project is fully deployed, most MediaWiki backend GET requests will be routed to whichever data center is nearest to the CDN node at which the request is received.

Deployment plan:

* Stage 1: test.wikipedia.org and test2.wikipedia.org. Already done. * Stage 2: mediawiki.org. Planned for deployment on August 15. * Stage 3: traffic percentage. A small percentage of all requests will be sent to the nearest DC. Date undecided, but could be as early as August 22. * Stage 4: full deployment. Date TBA. But it will be soon. If you need to update your tools, please start updating.

For more details, see T279664 https://phabricator.wikimedia.org/T279664.

I'm not aware of any blockers. As far as I know, we could fully deploy it now and it would more or less work. If you think otherwise, please let us know.

-- Tim Starling