I completely agree with Maarten. It would be a step backward to stop supporting 
cross-database joins on wiki replicas. This is a breaking change and should not 
be applied unless a feasible solution to the problem is found.
   On Saturday, March 13, 2021, 8:17:39 PM GMT+3, Maarten Dammers 
<[email protected]> wrote:  
 
   
Hi Joaquin,
 
Completely nothing was done with the community input about not being able to do 
cross wiki joins anymore [1]. In the past the WMF would do something with 
community input. I guess the new strategy is to just give the appearance of 
community input to legitimize a decision. Nice way to alienate the volunteers.
 
Maarten
 
[1]https://lists.wikimedia.org/pipermail/cloud/2020-November/thread.html#1309
 
 On 12-03-2021 19:16, Joaquin Oltra Hernandez wrote:
  
 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 [email protected], 
join the #wikimedia-cloud IRC channel, or open a ticket in Phabricator with the 
Data-Services tag. 
  Thanks,  
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