> -----Original Message-----
> From: Mark Waite
> Sent: Saturday, February 28, 2015 20:43
> 
> > On Sat, Feb 28, 2015 at 5:52 PM, Jason Pyeron wrote:
> >
> >     > -----Original Message-----
> >     > From: Vincent Latombe
> >     > Sent: Saturday, February 28, 2015 14:48
> >     >
> >     > Hi,
> >     >
> >     > A good habit is to check the release notes before updating.
> >     >
> >     > on https://wiki.jenkins-ci.org/display/JENKINS/Matrix+Project+Plugin
> >     
> >     Yes, lesson learned.
> >     
> >     I assumed a point release was fine, and that it had been tested in some 
> > sort of CI system.
>       
> Jason, I'm grateful that you reported the same problem that I 
> encountered this morning.  As far as I've experienced, this 

No problem, I reported it as I was debugging it for the next victim to search 
by google.

> was a very rare instance where a minor release of a plugin 
> had a major impact.

Not that I was actually checking the major vs minor change anyway.

> 
> We're still not as mature with upgrade testing as I'd like 
> (or at least, I'm not as mature with upgrade testing).  When 
> I have an upgrade concern, I typically need to construct 
> various upgrade scenarios to work through their 
> functionality.  It becomes even more challenging when 
> interacting with the update center, since it is a remote 
> system running "in production".

Understood, there are never enough resources.

> 
> Thanks for noting the problem to the mailing list for the 
> rest of us who learned from your observations.

The three biggest takeaways from this event:

1. The log MUST say WARNING: PLUGIN UPGRADE ___Name_of_plugin___ from 
___old_version___ to ___new_version___
https://issues.jenkins-ci.org/browse/JENKINS-27176

2. there should be an easy CLI mechanism to "disable" a plugin
https://issues.jenkins-ci.org/browse/JENKINS-27177

3. if the config.xml "requires" a unavailable plugin class, that section should 
be ignored.
https://issues.jenkins-ci.org/browse/JENKINS-27175

-Jason

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