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[Timur Sufiev <tsufiev@xxxxxxxxxxxx>]

Public bug reported:

The scale testing of Horizon faced a several problems with a lot of data
being received from Nova side when Horizon actually doesn't need so much
data.

First case is getting the volumes list from cinder, see
https://github.com/openstack/horizon/blob/2015.1.0b3/openstack_dashboard/dashboards/project/volumes/tabs.py#L90
- here all the instances are being requested from Nova side just to show
the names of Instances that Cinder volumes are attached to. In cases
when the total number of Instances is far more bigger than the number of
Volumes this causes a serious performance issues in Horizon where it
shouldn't.

Second case is getting Floating IPs list from Neutron,
https://github.com/openstack/horizon/blob/2015.1.0b3/openstack_dashboard/dashboards/project/access_and_security/tabs.py#L109
- here we again request all the instances from Nova just to show their
names for some Floating IPs (which number could be truly inferior to the
number of Instances).

Both cases could be avoided if we were able to request details for a
limited set of servers (specified by their IDs) from Nova.

** Affects: horizon
     Importance: Medium
     Assignee: Timur Sufiev (tsufiev-x)
         Status: New

** Affects: nova
     Importance: Undecided
         Status: New

** Also affects: nova
   Importance: Undecided
       Status: New

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Engineering Team, which is subscribed to OpenStack Dashboard (Horizon).
https://bugs.launchpad.net/bugs/1442310

Title:
  Nova API in Horizon sometimes act as a bottleneck

Status in OpenStack Dashboard (Horizon):
  New
Status in OpenStack Compute (Nova):
  New

Bug description:
  The scale testing of Horizon faced a several problems with a lot of
  data being received from Nova side when Horizon actually doesn't need
  so much data.

  First case is getting the volumes list from cinder, see
  https://github.com/openstack/horizon/blob/2015.1.0b3/openstack_dashboard/dashboards/project/volumes/tabs.py#L90
  - here all the instances are being requested from Nova side just to
  show the names of Instances that Cinder volumes are attached to. In
  cases when the total number of Instances is far more bigger than the
  number of Volumes this causes a serious performance issues in Horizon
  where it shouldn't.

  Second case is getting Floating IPs list from Neutron,
  https://github.com/openstack/horizon/blob/2015.1.0b3/openstack_dashboard/dashboards/project/access_and_security/tabs.py#L109
  - here we again request all the instances from Nova just to show their
  names for some Floating IPs (which number could be truly inferior to
  the number of Instances).

  Both cases could be avoided if we were able to request details for a
  limited set of servers (specified by their IDs) from Nova.

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