==============================================
#openstack-meeting-cp: cinder-nova-api-changes
==============================================


Meeting started by ildikov at 17:00:16 UTC.  The full logs are available
at
http://eavesdrop.openstack.org/meetings/cinder_nova_api_changes/2016/cinder_nova_api_changes.2016-11-07-17.00.log.html
.



Meeting summary
---------------

* we are trying to figure out whether to go with v1 or v2  (ildikov,
  17:07:32)
* it would be great having a more simpler approach  (ildikov, 17:09:11)
* reserve call remains as is  (ildikov, 17:13:17)
* it helps avoid races with multiple attach calls, etc.  (ildikov,
  17:13:44)
* should we have a reserve that creates an attachment_id?  (ildikov,
  17:15:26)
* the old or new version of the reserve call will get the instance_uuid
  as the Nova side has that the earliest  (ildikov, 17:17:34)
* in the new and shiny version of the proposal reserve will create the
  attachment record in Cinder and return the id  (ildikov, 17:19:03)
* regarding v1 and v2 John Garbutt thinks we need all the v2 calls
  (ildikov, 17:19:47)
* Nova can store additional info and handle locks to not have an attach,
  while we're detaching  (ildikov, 17:24:44)
* we need to shorten the window and have locks to eliminate races
  (ildikov, 17:27:51)
* Cinder returns info about either safe to detach or the info about the
  driver whether it shares connection or not  (ildikov, 17:28:35)
* locking needs to be done on Nova side, Nova gets all the info from
  Cinder that's needed  (ildikov, 17:47:08)
* if we have create_attachment, update_attachment and remove_attachment,
  we should not have reserve, let create handle the lock on Cinder side
  (ildikov, 17:49:10)
* one attach at a time even in case of multiattach just to be safe
  (ildikov, 17:49:52)
* after create, Nova sends the connection info to Cinder  (ildikov,
  17:50:51)
* Cinder returns the info about shared or not shared connection, so Nova
  has the info for disconnect  (ildikov, 17:51:29)
* do not remove attachment from Cinder before disconnect  (ildikov,
  17:51:48)
* Nova removes the attachments and calls disconnect when no further
  attachments remained  (ildikov, 17:53:35)
* live migrate: same instance_uuid but different hosts is enabled in
  Cinder  (ildikov, 17:54:32)
* we need both connections at the same time for making live migrate work
  (ildikov, 17:54:59)
* John Garbutt works on live migrate flow and update the spec  (ildikov,
  18:07:33)
* John Griffith updates v2 with the agreements from today's call on
  create/delete/update attachment  (ildikov, 18:08:17)
* Ildiko handles meeting minutes and administration  (ildikov, 18:10:14)



Meeting ended at 18:10:43 UTC.



People present (lines said)
---------------------------

* ildikov (44)
* hemna (7)
* scottda (6)
* smcginnis (5)
* mriedem (4)
* openstack (3)
* johnthetubaguy (3)
* jgriffith (2)



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