Hi! Most tools query just a single db at a time, so I don't think this will be a massive problem. However some such as Global Contribs[0] and GUC[1] can theoretically query all of them from a single request. Creating new connections on-the-fly seems doable in production, the issue is how to work on these tools in a local environment. Currently the recommendation is to use a SSH tunnel to the desired host,[2] such as enwiki.analytics.db.svc.eqiad.wmflabs. Surely we can't do this same port forwarding for 900+ connections.
Any ideas? Perhaps there's some way to make a host that automatically forwards to the correct one, solely for developer use? Or will development of such global tools need to happen in the Cloud Services environment? ~ MA [0] https://xtools.wmflabs.org/globalcontribs [1] https://guc.toolforge.org/ [2] https://wikitech.wikimedia.org/wiki/Help:Toolforge/Database#SSH_tunneling_for_local_testing_which_makes_use_of_Wiki_Replica_databases On Tue, Nov 10, 2020 at 3:26 PM Joaquin Oltra Hernandez < jhernan...@wikimedia.org> wrote: > TLDR: Wiki Replicas' architecture is being redesigned for stability and > performance. Cross database JOINs will not be available and a host > connection will only allow querying its associated DB. See [1] > <https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign> > for more details. > > Hi! > > In the interest of making and keeping Wiki Replicas a stable and > performant service, a new backend architecture is needed. There is some > impact in the features and usage patterns. > > What should I do? To avoid breaking changes, you can start making the > following changes *now*: > - Update existing tools to ensure queries are executed against the proper > database connection > - Eg: If you want to query the `eswiki_p` DB, you must connect to the > `eswiki.analytics.db.svc.eqiad.wmflabs` host and `eswiki_p` DB, and not to > enwiki or other hosts > - Check your existing tools and services queries for cross database JOINs, > rewrite the joins in application code > - Eg: If you are doing a join across databases, for example joining > `enwiki_p` and `eswiki_p`, you will need to query them separately, and > filter the results of the separate queries in the code > > Timeline: > - November - December: Early adopter testing > - January 2021: Existing and new systems online, transition period starts > - February 2021: Old hardware is decommissioned > > We need your help > - If you would like to beta test the new architecture, please let us know > and we will reach out to you soon > - Sharing examples / descriptions of how a tool or service was updated, > writing a common solution or some example code others can utilize and > reference, helping others on IRC and the mailing lists > > If you have questions or need help adapting your code or queries, please > contact us [2] > <https://wikitech.wikimedia.org/wiki/Help:Cloud_Services_communication>, > or write on the talk page [3] > <https://wikitech.wikimedia.org/wiki/Talk:News/Wiki_Replicas_2020_Redesign> > . > > We will be sending reminders, and more specific examples of the changes > via email and on the wiki page. For more information see [1] > <https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign>. > > [1]: https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign > [2]: https://wikitech.wikimedia.org/wiki/Help:Cloud_Services_communication > [3]: > https://wikitech.wikimedia.org/wiki/Talk:News/Wiki_Replicas_2020_Redesign > > -- > Joaquin Oltra Hernandez > Developer Advocate - Wikimedia Foundation > _______________________________________________ > Wikimedia Cloud Services announce mailing list > cloud-annou...@lists.wikimedia.org (formerly > labs-annou...@lists.wikimedia.org) > https://lists.wikimedia.org/mailman/listinfo/cloud-announce >
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