TLDR:
- Instead of `*.db.svc.eqiad.wmflabs` use `*.db.svc.wikimedia.cloud` to use the new replicas
- Quarry will migrate March 23 to use the new cluster
- In a ~month (April 15) the old cluster will start retiring. See https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign#Timeline for more details

Hi everyone,

I'm happy to announce that the new replicas cluster is available for use after a few weeks open for testing.

To use the new cluster, you will only need to change the hostname when connecting to the databases. Instead of `*.db.svc.eqiad.wmflabs` you can use `*.db.svc.wikimedia.cloud`. See:

- https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign#New_host_names
- https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign#How_can_I_test_the_new_replicas_before_the_switchover?
- https://wikitech.wikimedia.org/wiki/Help:Toolforge/Database

This brings us to the timeline updates:
https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign#Timeline

- March 2021
- Announce new cluster domains for all users - March 12
- Migrate Quarry to use the new cluster - March 23
- April 2021
- PAWS migration - Estimated first week of April
- Migrate the old cluster to utilize new replication hosts. Replication may stop. - April 15
- Redirect old hostnames to the new cluster - April 28

Quarry is ready so it will transition first to use the new replicas. This will happen on March 23, at which point we will deploy the changes and update the docs. We are publishing a note on Tech news but if there are other venues where this information would be useful please help us spread the word.

PAWS is in the process of being migrated. We estimate it could be ready to use the new cluster at the beginning of April, and will publish more details as soon as we know.

On April 15 the old cluster will be moved under the new replication hosts, at which point there may be side effects and replication may stop.

We recommend you update your code earlier to use the new hostnames to verify things are working normally.

Not long after, the old hostnames (`*.db.svc.eqiad.wmflabs`) will be redirected to the new ones (`*.db.svc.wikimedia.cloud`), at which point the old cluster will effectively be inaccessible.

If you have questions or need help please reply to cloud@lists.wikimedia.org, join the #wikimedia-cloud IRC channel, or open a ticket in Phabricator with the Data-Services tag.

Thanks,