On the serviceUtils dependency in OVSDB in mainly on UpgradeState Flag. Ovsdb depends on this flag to decide whether to trigger reconciliation or not when the openvswitch/hwvtep switch get connected to ODL.
As part of reconciliation, we compare config and oper DS and based on the difference we attempt to create/delete missing entries(ex: tunnels)
During Upgrade, when the southbound port 6640 is opened for accepting connection, its possible the config DS is not fully build-up and if reconciliation is triggered with partial config Data, we will end-up in deleting valid entries from the switches. In order to avoid this, ovsdb depends on upgrade flag and if it set, reconciliation will not be triggered. Once upgrade-flag is turned-off, then only we trigger reconciliation.
Thanks for the explanation. Unfortunately I could not find much about the upgrade feature -- do you know where a user guide or similar might be found, please?
