Zane, Thanks for putting the requirements list together. That's very helpful. There is a task-flow meeting today where we can discuss this. I added it to the agenda. Please attend if possible:
https://wiki.openstack.org/wiki/Meetings/StateManagement Thanks, Adrian On Jun 20, 2013, at 8:48 AM, Zane Bitter <zbit...@redhat.com> wrote: > After the Heat meeting yesterday I had a discussion with Keith Bray and > Jessica Lucci about what sort of features Heat needs from TaskFlow in order > to be able to adopt it as a workflow system. In the course of that discussion > I volunteered to put together a list of requirements, and here is my first > cut at that: > > https://wiki.openstack.org/wiki/Heat/TaskSystemRequirements > > The key point for me is that workflow is core to what an orchestration system > does, and therefore it is essential that we can continue to test integration > with it *directly*. > > That (combined with a reluctance to take on big external dependencies) makes > me sceptical of Celery or similar solutions, but hopefully this information > should be a good starting point for Celery experts like Jessica to figure out > why I'm wrong ;) > > > Incidentally, the coroutine-based task library that we're currently using in > Heat is becoming a bit more mature - I've been using it to orchestrate stack > updates, which is the most complicated workflow we have. The major remaining > pain point is missing the rollback features mentioned on the wiki page. If > this proves to be something that is useful across projects, I would be happy > to contribute it to Oslo. If anybody is interested in checking it out, the > code is here: > > https://github.com/openstack/heat/blob/master/heat/engine/scheduler.py > > cheers, > Zane. > > _______________________________________________ > OpenStack-dev mailing list > OpenStack-dev@lists.openstack.org > http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev _______________________________________________ OpenStack-dev mailing list OpenStack-dev@lists.openstack.org http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
