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[OpenStack Infra <1660025@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/426493
Committed: https://git.openstack.org/cgit/openstack/horizon/commit/?id=9810711e75723fc6d66772e10dc0a6ffc8e74198
Submitter: Zuul
Branch:    master

commit 9810711e75723fc6d66772e10dc0a6ffc8e74198
Author: Mateusz Kowalski <mateusz.kowalski@xxxxxxx>
Date:   Thu Mar 16 10:55:13 2017 +0100

    Make API calls in Volumes view parallel
    
    In order to increase rendering speed, make
    api.cinder.volume_list_paged, api.nova.server_list
    and api.cinder.volume_snapshot_list parallel.
    For admin panel also api.keystone.tenant_list is
    parallelized.
    
    Closes-bug: #1660025
    Partial-implements: blueprint fetch-resources-in-parallel
    
    Change-Id: Ic789ff98a59ba792d77103e7778883562e7977d2


** Changed in: horizon
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1660025

Title:
  Sequential API requests in volume list as a bottleneck

Status in OpenStack Dashboard (Horizon):
  Fix Released

Bug description:
  https://bugs.launchpad.net/horizon/+bug/1442310 indicates Nova API not
  allowing to pass list of instance ids in order to receive only data
  necessary for Horizon and reduce any overhead

  As long as Nova is not patched to allow this, from Horizon side
  _get_attached_instance_ids and _get_instances can be parallelized.
  Also volume_ids_with_snapshots can be run in parallel with the other
  ones.

  Apart from this, as Nova API calls Glance to map each instance with
  corresponding image which is definitely not needed for assignment
  between volume and instance, we can forge image.name to be empty for
  each instance in Volumes view. This further reduces time required for
  the whole view to render.

  This has significant impact in the following case
  * environment with a lot of instances
  * environment with instances boot from image which is not available anymore (as in this case Nova calls Glance for each(!) instance separately)

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