[ovs-dev] [PATCH] ovn: Make it possible for CMS to detect when the OVN system is up-to-date.

[Ben Pfaff]

On Mon, Jul 18, 2016 at 09:14:55AM -0700, Ben Pfaff wrote:
> Until now, there has been no reliable for the CMS (or ovn-nbctl, or
> anything else) to detect when changes made to the northbound configuration
> have been passed through to the southbound database or to the hypervisors.
> This commit adds this feature to the system, by adding sequence numbers
> to the northbound and southbound databases and adding code in ovn-nbctl,
> ovn-northd, and ovn-controller to keep those sequence numbers up-to-date.
> 
> The biggest user-visible change from this commit is new a new option
> --wait to ovn-nbctl.  With --wait=sb, ovn-nbctl now waits for ovn-northd
> to update the southbound database; with --wait=hv, it waits for the
> changes to make their way to Open vSwitch on every hypervisor.
> 
> Signed-off-by: Ben Pfaff <blp at ovn.org>

Oops, this was against an older repo, so I posted a near-trivial rebase
as v2:
        http://openvswitch.org/pipermail/dev/2016-July/075551.html