*We’re going to do more than one train next week – starting Mon, 21 March 2022*.
We’re aiming for four trains. 😬 ____ We’ve been running the train since version 1.20, <https://www.mediawiki.org/wiki/MediaWiki_1.20/Roadmap#Schedule_for_the_deployments> and we believe a more frequent train will be easier, faster, and safer. There are unknowns in this process. Our goal is to surface the unknowns to increase the safety and speed of deployment. *Please reach out* if you would like to be in closer contact with our team as part of this process.* ___ 📅 Schedule Join us in *#wikimedia-operations *IRC and *#engineering-all* slack for all the excitement. We’re also planning to use Google Meet sessions for pairing. If you’re interested in joining a session (and you’ve signed an NDA) sign up (with an email that can join a meet) on the trainsperiments page on MediaWiki <https://www.mediawiki.org/wiki/Talk:Wikimedia_Release_Engineering_Team/Trainsperiment_week> . Here’s the schedule—*two trains in 24 hours to start the week*: - *Mon, 21 March 2022* - UTC AM Train – 09:00 : - +0 minutes – 1.39.0-wmf.1 Group0 - +30m – 1.39.0-wmf.1 Group1 - UTC PM Train – 18:00: - +0 minutes – 1.39.0-wmf.1 All Wikis - +30m – 1.39.0-wmf.2 Group0 (Δ 10 hours) - +45m – 1.39.0-wmf.2 Group1 - +90m – 1.39.0-wmf.2 All Wikis - *Tue, 22 March 2022* - UTC AM Train – 09:00: - +0 minutes – 1.39.0-wmf.3 Group0 (Δ 14 hours) - +15m – 1.39.0-wmf.3 Group1 - +60m – 1.39.0-wmf.3 All Wikis - *Wed, 23 March 2022* - UTC PM Train – 18:00 - +0 minutes – 1.39.0-wmf.4 Group0 (Δ 20 hours) - +15m – 1.39.0-wmf.4 Group1 - +60m – 1.39.0-wmf.4 All Wikis - *Thu, 24 March 2022* - UTC AM Train – 09:00: Catchup and cleanup - UTC PM Train – 18:00: Catchup and cleanup ____ 🤔 Unknowns Here’s a list of things we know we don’t know. If you can help with any of these: reach out! - How will more trains affect caches and site performance? (T303758 <https://phabricator.wikimedia.org/T303758>) - Are developers going to need to be more mindful of forward and backward compatibility? (T303759 <https://phabricator.wikimedia.org/T303759>) - How will rollback work with blockers? This one is on us, but we’ll be figuring it out as we go. (T303747 <https://phabricator.wikimedia.org/T303747>) - Will blocker tasks be too confusing with so many trains? - Is this sustainable? ___ *💌 Get in touch - Reply to this email - Start a topic on our talk page: https://www.mediawiki.org/wiki/Talk:Wikimedia_Release_Engineering_Team/Trainsperiment_week - Put a task on our workboard: https://phabricator.wikimedia.org/project/board/5811/ Tyler Cipriani (he/him) Engineering Manager, Release Engineering Wikimedia Foundation
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