[Bug 1742649] Re: map_instances default batch size is too small.

[James Page]

** Changed in: cloud-archive
       Status: New => Triaged

** Changed in: cloud-archive
   Importance: Undecided => Low

** Changed in: nova (Ubuntu)
   Importance: Undecided => Low

** Changed in: nova (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1742649

Title:
  map_instances default batch size is too small.

Status in Ubuntu Cloud Archive:
  Triaged
Status in OpenStack Compute (nova):
  Opinion
Status in nova package in Ubuntu:
  Triaged

Bug description:
  Description
  ===========

  map_instances seemingly hung for hours on a cloud with ~190000
  instance records. I think the following fixes are valid (in order of
  preference):

  1) nova_manage should examine the amount of instances that need mapping and make an informed choice about batch size if max_count is not set.
  2) max_counts default should be raised. It is currently 50 and I cannot imagine what use case 50 is a good default for. For small clouds the max_count is almost irrelevant, for medium/large clouds 50 is far too low.
  3) Update max_count description. It currently reads "Maximum number of instances to map" but I think it should also point out that this is the batch size that instances will be processed in.

  Steps to reproduce
  ==================

  Fire up a large number of instances on a cloud and run map_instances
  without max_count set:

  nova-manage --config-file /etc/nova/nova.conf cell_v2 map_instances
  --cell_uuid <uuid>

  Expected result
  ===============

  The command should complete in a reasonable time (under an hour)

  Actual result
  =============

  Command runs for over three hours

  Environment
  ===========
  1. Exact version of OpenStack you are running. See the following
    list for all releases: http://docs.openstack.org/releases/

     If this is from a distro please provide

  # dpkg -l | grep nova
  ii  nova-api-os-compute              2:16.0.3-0ubuntu1~cloud0                   all          OpenStack Compute - OpenStack Compute API frontend
  ii  nova-common                      2:16.0.3-0ubuntu1~cloud0                   all          OpenStack Compute - common files
  ii  nova-conductor                   2:16.0.3-0ubuntu1~cloud0                   all          OpenStack Compute - conductor service
  ii  nova-placement-api               2:16.0.3-0ubuntu1~cloud0                   all          OpenStack Compute - placement API frontend
  ii  nova-scheduler                   2:16.0.3-0ubuntu1~cloud0                   all          OpenStack Compute - virtual machine scheduler
  ii  python-nova                      2:16.0.3-0ubuntu1~cloud0                   all          OpenStack Compute Python libraries

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