On 2020-05-27 11:02:17 -0400 (-0400), Scott Little wrote:
The two updates in question:
utilities: https://review.opendev.org/#/c/730108/
ansible-playbooks: https://review.opendev.org/#/c/730113/
730113 depends in 730108
730108 was WF-1 to prevent merge until 730113 was reviewd
730113 received it's +2/+1 ... Zuul didn't merge because 730108 was not merged.
730108 is given it's WF+1 late Friday and merged.
Expected behavior was for 730113 to 'wake up' within zuul and merge.
It did not, and the builds produced unusable loads until the issue was noticed on Monday. 730113 had to be given a new WF+1 to wake it up and merge.
Zuul has logic to enqueue dependent changes together *if* their projects share a change queue. It does not have any feature to find changes which were blocked on other changes they don't share a change queue with, so doesn't know to automatically enqueue them once their dependencies merge. Zuul's pipeline enqueuing logic is event-driven, and only "wakes up" changes on events for related changes if they can be enqueued and tested together. Declaring cross-project dependencies between changes in projects which do not share a change queue serves only to block changes from merging, but will need a new enqueuing event for the depending change once its dependencies are satisfied, for example by removing and re-adding a Workflow +1 approval or a different reviewer adding a second Workflow +1. The note at https://zuul-ci.org/docs/zuul/discussion/gating.html#dependent-pipeline hints at this, but I've just now proposed https://review.opendev.org/731246 to make it more clear that the second change in this scenario is not automatically enqueued. -- Jeremy Stanley