ODL MD reconnection after restart

[Fabrizio Soppelsa]

OpenDaylight backend controller integration with Neutron MD doesn't process any traitment when it receives 401 http error (Unauthorized) which happens after ODL restarts.

The only way to recover is to restart neutron.

[Fabrizio Soppelsa (fsoppelsa)]

See also https://bugs.launchpad.net/networking-odl/+bug/1376169

[Fabrizio Soppelsa (fsoppelsa)]

I've got an informal notification that this won't be backported to 5.1.x.
Will it?

[Alexander Ignatov (aignatov)]

According to internal discussions I'd suggest to mark this bug as Won't fix for any 5.x series.

Here is observations/findings:
===
There was a fix for Icehouse [1], but it was decided to not backport.
Here is a comment from Ed Warnicke (member of ODL project):

======================================
"I would suggest *not* backporting this patch.
The reason is this:
This patch fixes a bug that was introduced hacking around a performance bug in the Helium Release of ODL. That bug is fixed in Lithium (our upcoming release) but will not be fixed in Helium (long story).
By backporting this patch you will break performance when Icehouse talkes to Helium."
======================================

So we can backport for 5.1.1 but it may be risky according to the above comment.

[1] https://review.openstack.org/157116/
==

[Alexander Ignatov (aignatov)]

Another one:

==================
Yes, we wouldn’t land this fix to 5.1.2 since investigation through comments and bug history stats that original fix on the review (Abandoned) will break the performance.
Actually we don’t have much expertise with ODL and other vendor plugins, at least to check the a behavior of this patch with ODL so we can’t confirm if this patch is good or bad.
So here we are relying on conversations in upstream and current status of this patch.
==================

[Alexander Ignatov (aignatov)]

For 6.0 which is Juno this issue is already fixed as a fix for ODL

[Dmitry Mescheryakov (dmitrymex)]

Since the issue is actually fixed in 6.0 (fix came from the upstream), setting status to invalid for 6.x