[Labs-admin] Maintenance during switchover time may affect labs and analytics users due to replicatin lag

[Chase Pettet]

Thanks for the heads up Jaime.  We'll announce to our audience(s) and put
up some notices to that effect during this time.


Chase

On Wed, Apr 5, 2017 at 12:03 PM, Jaime Crespo <jcrespo at wikimedia.org> wrote:

> Hello admins from Cloud and Analytics groups,
>
> There is some extended maintenance scheduled for databases on eqiad while
> it is a passive datacenter for mediawiki in the upcoming datacenter
> switchover (as a reminder, the switchover will happen between 19 April and
> 3 May.).
>
> Services themselves will not be affected (labs and analytics servers are
> not to be touched), but due to high priority schema changes and other
> cleanup work that cannot be done otherwise, replication from production
> (codfw, Texas-mediawiki) to labs and analytics replicas may lag for some
> hours at times. This is unavoidable because both LabsDBs and analytics is
> eqiad-(Virginia datacenter) only. I hope you believe me that I am sorry for
> the inconveniences, but the improvements not only will make mediawiki
> better, also will impact positively your replica services (faster and more
> reliable propagation of changes).
>
> * Services affected: extended lag compared to production on labsdb
> replicas (old and new) for tools and cloud, analytics store, analytics
> slave (mediawiki data)
> * Services definitely not affected: toolsdb, eventlogging, postgres, osm,
> any other service not related to databases
>
> Details:
> * https://phabricator.wikimedia.org/T155099 (DBA task for maintenance
> coordination)
> * Internal draft for the blog post soon to be published: https://office.
> wikimedia.org/wiki/Community_Liaisons/codfw#Initial_blog_post
>
> Up to you if and when you want to announce it in advance. I am available
> for questions an clarifications. Again, my apologies,
>
> --
> Jaime Crespo
> <http://wikimedia.org>
>
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> Labs-admin at lists.wikimedia.org
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>
>
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