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Excerpts from Joshua Harlow's message of 2016-07-15 18:00:37 -0700:
> I assume this is connected into:
> 
> https://review.openstack.org/#/c/334014/
> 
> Which was proposed a few weeks ago, I'd be nice to identify the causing 
> review and see if we can find the authors to learn about why,

The KeyError was being raised in error, not as an explicit way to
indicate that a plugin was missing. We classified that as buggy
behavior rather than an API change. There was one other place this was
relying on the behavior and they have fixed their app code (I don't
remember off the top of my head which project that was).

The best course of action is to change IPA to use the callback mechanism
added as the official API and to require the newer version of stevedore
that supports that callback by raising the minimum in the global
requirements list.

Doug

> 
> If its needed, proposing a requirements block is fine with me (until we 
> can get to the root of this).
> 
> -Josh
> 
> Jay Faulkner wrote:
> > Hi all,
> >
> > I wanted to get a little more light on this bug discovered:
> > https://bugs.launchpad.net/stevedore/+bug/1603542
> > <https://bugs.launchpad.net/stevedore/+bug/1603542>. Jim posted a
> > summary of it today in #openstack-oslo and didn't get a response, and
> > it's currently breaking IPA's gate. If someone familiar with stevedore
> > could please triage the bug and start moving it towards a resolution,
> > I'd greatly appreciate it, as IPA's gate is broken and stuck until it is
> > fixed.
> >
> > While it's a big hammer I'd like to avoid using, but if there's no
> > moment on this bug by Monday, I'll propose a global-requirements change
> > to blacklist this version of stevedore until a solution is determined
> > since IPA is completely blocked from merging changes.
> >
> > This breakage does not impact the Ironic gate, as Ironic uses prebuilt
> > TinyIPA ramdisk images, and no image has been published with the new
> > breaking stevedore since these problems were caught in CI.
> >
> > Thanks,
> > Jay Faulkner
> > OSIC
> >
> > P.S. Kudos to ironic-inspector folks for writing a great unit test to
> > catch this behavior in our CI rather than having it break users!
> >
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