Planned deployment of 1.17 branch on February 8

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The engineering team is busy working on the deployment of the 1.17 branch of MediaWiki.  We plan to roll this out next week to all languages and projects, Tuesday, February 8, with work starting at 07:00 UTC (which is 11pm on Monday, February 7 for San Francisco).
If all goes well, you should only notice the improvement. If it doesn’t go well, that’s because there’s something we missed, and that’s where we’d love your help.  Please help us test this release! We have a test instance of the software we plan to deploy available at  If you find issues, please report them in Bugzilla.
There are many, many little fixes and improvements that have gone into 1.17 (see the draft release notes for an exhaustive list) .  There isn’t much that’s visible to users of the site, but one under the hood improvement that should result in some speed improvements: Resource Loader.  Resource Loader optimizes the use of JavaScript in MediaWiki, speeding up delivery of JavaScript by compressing it sometimes, and cutting down on the amount of unused JavaScript that gets delivered to the browser in the first place.  Much of the work in this development cycle has been centered on ensuring compatibility with the new system.  Since it makes such a large shift in the way that JavaScript is delivered to the browser, it’s also an operational aspect we’ll be keeping a close eye on, as load shifts between servers in our infrastructure.
Note that this isn’t a release for download, yet.  On and after February 8, the “latest” version of MediaWiki will still be 1.16 as listed on  We plan to update this to 1.17 sometime after the deployment of the 1.17 branch, after we’ve had time to run it in production for a while and fix the issues we’re likely to find.
So please, help us test this release, and if you find bugs, please report them in Bugzilla.  Thanks!

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1) us this update deployed for ukrainian wiki, for now
2) how can I figure out the version. Without asking questions here 🙂

Hi Alex, you can see which version is running on the Ukrainian Wikipedia here:
The upgrade is taking us longer than anticipated, so as of this writing, it will still report “1.16wmf4” (the old version). When we complete the upgrade, it will report “1.17wmf1”

Is the server that distributes mobile device views of Wikipedia pages having problems the last few days?
No mobile view is noted on the iPhone devices as of Monday, Feb 7, 2011.