On 10/06/2017 07:23 PM, Kevin Benton wrote:
>The neutron story is mixed on accessable upgrade, because at least in some cases, like ovs, upgrade might trigger a network tear down / rebuild that generates an outage (though typically a pretty small one).

This shouldn't happen. If it does it should be reported as a bug. All existing OVS flows are left in place during agent initialization and we don't get rid of the old ones until the agent finishes setting up the new ones.

I thought it was literally a problem with the daemon restart where it is stateful and does a teardown / rebuild when started. I'd be happy to be wrong about that, but was told in the past that it was just an OVS limitation.


Sean Dague

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