[rdo-list] Third party DLRN CI and the need for a "-head" builder

Hi, So with the help of Paul Belanger, we've identified the issue that prevented the "openstack-check-verified" pipeline from working. The Zuul openstack-check-verified pipeline [1] from review.rdoproject.org can be used to trigger builds on upstream projects on each patchset, only when Jenkins has +1'd it. The goal with this pipeline is to do third party CI with DLRN in order to try and build projects' patches to warn us for failure to build errors ahead of time, even before the change merges. We're not planning on voting on the Gerrit changes, it's solely to check if there are any issues building the project with that particular patch. So we really have two Ocata DLRN instances now, one that is pinned to upper-constraints [2] and one that builds the "master of everything" [3]. I was thinking... If we're able to do third party CI against upstream with DLRN do we need that "head" instance ? The "head" instance exists, as far as I know, to let us know if anything from unpinned projects fails to build. The third party CI will let us know that -- and even before, ahead of time, before the change causing the failure even merges. Thoughts ? [1]: https://review.rdoproject.org/r/gitweb?p=config.git;a=blob;f=zuul/upstrea... [2]: https://trunk.rdoproject.org/centos7-master/ [3]: https://trunk.rdoproject.org/centos7-master-head/ David Moreau Simard Senior Software Engineer | Openstack RDO dmsimard = [irc, github, twitter]