[Engineering] 1.27.0-wmf.23 rolled back from Wikipedias

Fri May 6 15:14:35 UTC 2016

I'm currently writing the next Tech News issue. Is that bug will delay the
next MediaWiki deployment?

Thanks,
Benoît

On Fri, May 6, 2016 at 8:43 AM, Ori Livneh <ori at wikimedia.org> wrote:

> The roll-out of 1.27.0-wmf.23 to all Wikipedias coincided with a
> significant (~100-150ms) increase in first paint time for Wikimedia page
> views. First paint time is the time it takes the user to see anything on
> the screen after clicking on a link. Keeping it low is crucial to good user
> experience, and this is a severe regression, so I rolled back wmf.23, in
> coordination with Chad and Tyler from Release Engineering.
>
> In the graph below, the green line shows median first paint time in
> milliseconds over the course of the past 24 hours. The blue line shows what
> the value was that time the day before. You can see they diverge shortly
> after 19:00 UTC and converge around 4:20 UTC.
>
> <removed>
> 
> I have not investigated any further than that yet, but the train is
> blocked on isolating and fixing this regression (or disproving it, if it is
> a bug in the instrumentation). This is tracked in Phabricator as
> https://phabricator.wikimedia.org/T134553. You are encouraged to help
> out. :)
>
> Ori
>
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>

-- 
Benoît Evellin (Trizek)
Community Liaison
Wikimedia Foundation
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