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bbfa235
(Get the code!)
The upstream recommendation for upgrades of OVN is to first upgrade the data plane components (chassis aka. ovn-controller), and then upgrade the central components (the database schema and ovn-northd). The rationale for this is that the new version of the ovn-controller is required to cope with any changes to database schema or how northd programs flows.
However, during the course of rapid OVN development there has also been introduced changes that make the new ovn-controller not cope with a old database schema, breaking the recommended upgrade procedure.
To cope with this upstream has introduced a new optional configuration for the ovn-controller that allows it to detect version inconsistencies, and when they are present stop it from making changes to the data plane until the version inconsistency is resolved [0].
The charms should enable this option to allow upgrades to progress with less data plane outage.
0: https:/