[openstack-dev] [Heat] Convergence Phase 1 implementation plan

Sergey Kraynev skraynev at mirantis.com
Mon Jan 26 16:16:45 UTC 2015

On 24 January 2015 at 00:00, Zane Bitter <zbitter at redhat.com> wrote:

> I've mentioned this in passing a few times, but I want to lay it out here
> in a bit more detail for comment. Basically we're implementing convergence
> at a time when we still have a lot of 'unit' tests that are really
> integration tests, and we don't want to have to rewrite them to anticipate
> this new architecture, nor wait until they have all been converted into
> functional tests. And of course it goes without saying that we have to land
> all of these changes without breaking anything for users.
> To those ends, my proposal is that we (temporarily) support two code
> paths: the existing, legacy in-memory path and the new, distributed
> convergence path. Stacks will contain a field indicating which code path
> they were created with, and each stack will be operated on only by that
> same code path throughout its lifecycle (i.e. a stack created in legacy
> mode will always use the legacy code). We'll add a config option, off by
> default, to enable the new code path. That way users can switch over at a
> time of their choosing. When we're satisfied that it's stable enough we can
> flip the default (note: IMHO this would have to happen before kilo-3 in
> order to make it for the Kilo release).
> Based on this plan, I had a go at breaking the work down into discrete
> tasks, and because it turned out to be really long I put it in an etherpad
> rather than include it here:
> https://etherpad.openstack.org/p/heat-convergence-tasks
> If anyone has additions/changes then I suggest adding them to that
> etherpad and replying to this message to flag your changes.

I do not want to be assertive and greedy, so I toke several task, which IMO
are not required a lot of time for implementation and deep understanding
tricky things :) (Marked them on etherpad)
Also I don't want to steal work from guys who designed whole staff with
you. I think, that we could take more tasks later, when other volunteers
will be satisfied. I believe, that work will be enough for everyone. :)

> To be clear, it's unlikely I will have time to do the implementation work
> on any of these tasks myself (although I will be trying to review as many
> of them as possible). So the goal here is to get as many contributors
> involved in doing stuff in parallel as we can.
> There are obviously dependencies between many of these tasks, so my plan
> is to raise each one as a blueprint so we can see the magic picture that
> Launchpad shows. I want to get feedback first though, because there are 18
> of them so far, and rejigging everything in response to feedback would be a
> bit of a pain.
> I'm also prepared to propose specs for all of these _if_ people think that
> would be helpful. I see three options here:
>  - Propose 18 fairly minimal specs (maybe in a single review?)
>  - Propose 1 large spec (essentially the contents of that etherpad)
>  - Just discuss in the etherpad rather than Gerrit
I tend to choose etherpad, because it makes review and discussion faster.
(i.e. all in one place is easier for reading and referencing).

> Obviously that's in decreasing order of the amount of work required, but
> I'll do whatever folks think best for discussion.
> cheers,
> Zane.
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