Open Stack

Firstly, this is a great feature - thanks for getting it implemented!

> -----Original Message-----
> From: James E. Blair [mailto:corvus at inaugust.com]
> Sent: 10 February 2015 22:26
> To: OpenStack Development Mailing List
> Cc: openstack-infra at lists.openstack.org
> Subject: [openstack-dev] Cross-Repo Dependencies in Zuul
> 
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> 
> Cross-Repo Dependencies Explained
> =================================
> 
> There are two behaviors that might go by the name "cross-repo
> dependencies".  We call them one-way and multi-way.
> 
> Multi-way CRD allow for bidirectional links between changes.  For
> instance, A depends on B and B depends on A.  The theory there is that
> both would be tested together and merged as a unit.  This is _not_ what
> we have implemented in Zuul.  Discussions over the past two years have
> revealed that this type of behavior could cause problems for continuous
> deploments as it means that two components must be upgraded
> simultaneously.  Not supporting this behavior is a choice we have made.
> 
> One-way CRD behaves like a directed acyclic graph (DAG), like git
> itself, to indicate a one-way dependency relationship between changes in
> different git repos.  Change A may depend on B, but B may not depend on
> A.  This is what we have implemented in Zuul.
> 
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> 
> Multiple Changes
> ================
> 
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> 
> A change may depend on more than one Gerrit change ID as well.  So it is
> possible for a change in tempest to depend on a change in devstack and a
> change in nova.  Simply add more "Depends-On:" lines to the footer.

Have you considered a case where changes A and C are in nova, and change B is in neutron such that A depends on B depends on C?

And does that create a similar, and uncaught, situation as per the Multi-way CRD, where two components will need to be updated simultaneously?

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> 
> -Jim
> 
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Thanks, 
Jon-Paul Sullivan ☺ Cloud Services - @hpcloud

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