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On 03/14/2016 09:52 PM, Gorka Eguileor wrote:
> Hi,
>
> As you all probably know, during this cycle we have introduced quite a
> big number of changes in cinder that will have a great impact in the
> development of the new functionality as well as changes to existing ones
> moving forward from an implementation perspective.
>
> These changes to the cinder code include, but are not limited to,
> microversions, rolling upgrades, and conditional DB update functionality
> to remove API races, and while the latter has a good number of examples
> already merged and more patches under review, the other 2 have just been
> introduced and there are no patches in cinder that can serve as easy
> reference on how to use them.
>
> As cinder developers we will all have to take these changes into account
> in our new patches, but it is hard to do so when one doesn't have an
> in-depth knowledge of them, and while we all probably know quite a bit
> about them, it will take some time to get familiar enough to be aware of
> *all* the implications of the changes made by newer patches.
>
> And it's for this reason that I would like to suggest that during this
> summit's cinder design sessions we take the time to go through the
> changes giving not only an example of how they should be used in a
> patch, but also the do's, dont's and gotchas.
>
> A possible format for these explanations could be a presentation -around
> 30 minutes- by the people that were involved in the development,
> followed by Q&A.
>
> I would have expected to see some of these in the "Upstream Dev" track,
> but unfortunately I don't (maybe I'm just missing them with all the cool
> title names).  And maybe these talks are not relevant for that track,
> being so specific and only relevant to cinder developers and all.
>
> I believe these presentations would help the cinder team increase the
> adoption speed of these features while reducing the learning curve and
> the number of bugs introduced in the code caused by gaps in our
> knowledge and misinterpretations of the new functionality.
>
> I would take lead on the conditional DB updates functionality, and I
> would have no problem doing the Rolling upgrades presentation as well.
> But I believe there are people more qualified and more deserving of
> doing that one; though I offer my help if they want it.
>
> I have added those 3 topics to the Etherpad with Newton Cinder Design
> Summit Ideas [1] so people can volunteer and express their ideas in
> there.
>
> Cheers,
> Gorka.

I can certainly do one on rolling upgrades from developer's perspective.
I think I've got this knowledge summed up in patch to enhance the devref
[1], but of course presentation and Q&A would be beneficial.

And by the way - I think that for all the stuff that's worthy of such
presentation, we should have a detailed devref page.

[1] https://review.openstack.org/#/c/279186/