[all] Gate resources and performance
dtantsur at redhat.com
Sun Feb 7 13:58:14 UTC 2021
On Sat, Feb 6, 2021 at 8:52 PM Slawek Kaplonski <skaplons at redhat.com> wrote:
> Dnia sobota, 6 lutego 2021 10:33:17 CET Dmitry Tantsur pisze:
> > On Sat, Feb 6, 2021 at 12:10 AM Jeremy Stanley <fungi at yuggoth.org>
> > > On 2021-02-05 22:52:15 +0100 (+0100), Dmitry Tantsur wrote:
> > > [...]
> > >
> > > > 7.1. Stop marking dependent patches with Verified-2 if their
> > > > parent fails in the gate, keep them at Verified+1 (their previous
> > > > state). This is a common source of unnecessary rechecks in the
> > > > ironic land.
> > >
> > > [...]
> > >
> > > Zuul generally assumes that if a change fails tests, it's going to
> > > need to be revised.
> > Very unfortunately, it's far from being the case in the ironic world.
> > > Gerrit will absolutely refuse to allow a change
> > > to merge if its parent has been revised and the child has not been
> > > rebased onto that new revision. Revising or rebasing a change clears
> > > the Verified label and will require new test results.
> > This is fair, I'm only referring to the case where the parent has to be
> > rechecked because of a transient problem.
> > > Which one or
> > > more of these conditions should be considered faulty? I'm guessing
> > > you're going to say it's the first one, that we shouldn't assume
> > > just because a change fails tests that means it needs to be fixed.
> > Unfortunately, yes.
> > A parallel proposal, that has been rejected numerous times, is to allow
> > recheching only the failed jobs.
> Even if I totally understand cons of that I would also be for such
> possibility. Maybe e.g. if only cores would have such possibility somehow
> would be good trade off?
That would work for me.
Although currently there is an unfortunately tendency between newcomers to
blindly recheck their patches despite clearly not passing some checks. If
they could recheck only some jobs, it would limit their negative impact on
the whole CI (and maybe make them realize that it's always the same jobs
> > Dmitry
> > > This takes us back to the other subthread, wherein we entertain the
> > > notion that if changes have failing jobs and the changes themselves
> > > aren't at fault, then we should accept this as commonplace and lower
> > > our expectations.
> > >
> > > Keep in mind that the primary source of pain here is one OpenStack
> > > has chosen. That is, the "clean check" requirement that a change get
> > > a +1 test result in the check pipeline before it can enter the gate
> > > pipeline. This is an arbitrary pipeline criterion, chosen to keep
> > > problematic changes from getting approved and making their way
> > > through the gate queue like a wrecking-ball, causing repeated test
> > > resets for the changes after them until they reach the front and
> > > Zuul is finally able to determine they're not just conflicting with
> > > other changes ahead. If a major pain for Ironic and other OpenStack
> > > projects is the need to revisit the check pipeline after a gate
> > > failure, that can be alleviated by dropping the clean check
> > > requirement.
> > >
> > > Without clean check, a change which got a -2 in the gate could
> > > simply be enqueued directly back to the gate again. This is how it
> > > works in our other Zuul tenants. But the reason OpenStack started
> > > enforcing it is that reviewers couldn't be bothered to confirm
> > > changes really were reasonable, had *recent* passing check results,
> > > and confirmed that observed job failures were truly unrelated to the
> > > changes themselves.
> > > --
> > > Jeremy Stanley
> > --
> > Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
> > Commercial register: Amtsgericht Muenchen, HRB 153243,
> > Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael
> > O'Neill
> Slawek Kaplonski
> Principal Software Engineer
> Red Hat
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael
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