[QA] Recently failing browser tests

Jon Robson jrobson at wikimedia.org
Mon Jun 1 17:11:13 UTC 2015

Who would be suitable to debug these with and/or examine the caching on
beta labs? Whilst they fail like this they are useless to us (I've already
had a request to turn off the e-mail notifications).

It seems Bryan had an idea on the related bug

I am free today (and in the office) if anyone wants to pair and get this

On Thu, May 28, 2015 at 9:53 AM, Greg Grossmeier <greg at wikimedia.org> wrote:

> (let's use mailing lists instead of manually cc'ing people, please)
> Timo/Jon: Do you have tasks in phabricator that show what you've tried
> doing/debugging already? Would hate to re-do it all.
> Greg
> <quote name="Timo Tijhof" date="2015-05-28" time="11:57:05 +0200">
> > I've seen this and similar issues on beta cluster for almost a year now
> and am reasonably certain that there is no bug in ResourceLoader related to
> this. We might uncover an indirect cause in MediaWiki core later, but the
> immediate cause is most likely in Beta cluster. This because I've observed
> the relevant issues with non-ResourceLoader requests as well. And because
> we've not been able to reproduce this in production.
> >
> > I don't know enough about Beta cluster or our http caching to know how
> to help. I've already exhausted possibly causes I can think of on my own –
> last month. However I'm happy to join a hangout session at some point to
> consult and help pinpoint the problem from a MediaWiki perspective, we
> should have a prod opsen (knowledgable about Varnish), and a beta devop
> present there as well.
> >
> > -- Timo
> >
> > > On 28 May 2015, at 11:37, Jon Robson <jrobson at wikimedia.org> wrote:
> > >
> > > Firstly apologises for all the browser test spam recently. This is an
> update on what is going on and to give you confidence it is being taken
> seriously.
> > >
> > > I've managed to trace the issue to some kind of caching problem in
> mediawiki core but I'm a bit out of my depth trying to work it out.
> > >
> > > Basically under certain circumstances our code is broken and this is
> why the tests are failing.
> > >
> > > The issue is that we are serving old JavaScript along with new
> JavaScript and these files are naturally incompatible causing the errors as
> they are trying to access old frontend APIs that no longer exist.
> > >
> > > How ResourceLoader deals with caching changed last month and I suspect
> there is a bug in that code. I suspect Timo would be able to help me chase
> down the route cause further.
> > >
> > > In the meantime I'm not sure if there is a way to stop the email spam
> till this gets resolved. One idea I had was that when a test build fails it
> would be great if the email alerts stopped and developers become
> responsible for restarting them. Greg/Antoine/Dan is this possible? There's
> little benefit in continuing to run them every day and emailing about
> faikures until this test is fixed.
> > >
> > > Any help on https://phabricator.wikimedia.org/T100542 much
> appreciated. I'm out of my depth as this issue seems to fall outside the
> good ship readership and more in the ResourceLoader and quality assurance
> sea.
> --
> | Greg Grossmeier            GPG: B2FA 27B1 F7EB D327 6B8E |
> | identi.ca: @greg                A18D 1138 8E47 FAC8 1C7D |
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