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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Yeah looks like it was an accidental regression in Pike:

https://review.openstack.org/#/c/483564/

** Changed in: nova
       Status: New => Confirmed

** Changed in: nova
   Importance: Undecided => Medium

** Tags added: low-hanging-fruit scheduler serviceability

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

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

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

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https://bugs.launchpad.net/bugs/1816360

Title:
  nova-scheduler did not logged the weight of each compute_node

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) pike series:
  New
Status in OpenStack Compute (nova) queens series:
  New
Status in OpenStack Compute (nova) rocky series:
  New

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

  nova-scheduler did not logged the weight of each compute_node, even if we configured "debug=true".
  You can only see this in nova-scheduler.log (Rocky version).

  2019-02-18 15:02:56.918 18716 DEBUG nova.scheduler.filter_scheduler
  [req-242d0408-395d-4dc2-a237-e3f2b55c2ba8
  8fdccd78f9404ccbb427b0b798f46f67 d8706f56f2314bbb8e62463ba833bb1e -
  default default] Weighed [(nail1, nail1) ram: 27527MB disk: 226304MB
  io_ops: 0 instances: 2, (Shelf1Slot3SBCR, Shelf1Slot3SBCR) ram:
  12743MB disk: 112640MB io_ops: 0 instances: 3, (nail2, nail2) ram:
  19919MB disk: 120832MB io_ops: 0 instances: 0] _get_sorted_hosts
  /usr/lib/python2.7/site-
  packages/nova/scheduler/filter_scheduler.py:455

  But in kilo OpenStack, we can see:

  2019-02-18 15:31:07.418 24797 DEBUG nova.scheduler.filter_scheduler
  [req-9449a23f-643d-45a1-aed7-9d62639d874d
  8228476c4baf4a819f2c7b890069c5d1 7240ab9c4351484095c15ae33e0abd0b - -
  -] Weighed [WeighedHost [host: (computer16-02, computer16-02)
  ram:45980 disk:69632 io_ops:0 instances:11, weight: 1.0], WeighedHost
  [host: (computer16-08, computer16-08) ram:45980 disk:73728 io_ops:0
  instances:15, weight: 1.0], WeighedHost [host: (computer16-03,
  computer16-03) ram:43932 disk:117760 io_ops:0 instances:10, weight:
  0.955458895172], WeighedHost [host: (computer16-07, computer16-07)
  ram:43932 disk:267264 io_ops:0 instances:11, weight: 0.955458895172],
  WeighedHost [host: (computer16-15, computer16-15) ram:41884
  disk:-114688 io_ops:0 instances:15, weight: 0.910917790344],
  WeighedHost [host: (computer16-16, computer16-16) ram:35740
  disk:967680 io_ops:0 instances:10, weight: 0.777294475859],
  WeighedHost [host: (computer16-12, computer16-12) ram:31644
  disk:-301056 io_ops:0 instances:13, weight: 0.688212266203],
  WeighedHost [host: (computer16-05, computer16-05) ram:25500
  disk:-316416 io_ops:0 instances:13, weight: 0.554588951718],
  WeighedHost [host: (computer16-06, computer16-06) ram:17308
  disk:-66560 io_ops:0 instances:12, weight: 0.376424532405]] _schedule
  /usr/lib/python2.7/site-
  packages/nova/scheduler/filter_scheduler.py:149

  Obviously, we have lost the weight value for each compute_nodes now.

  
  Environment
  ===========

  [root@nail1 ~]# rpm -qi openstack-nova-api
  Name        : openstack-nova-api
  Epoch       : 1
  Version     : 18.0.2
  Release     : 1.el7
  Architecture: noarch
  Install Date: Wed 17 Oct 2018 02:23:03 PM CST
  Group       : Unspecified
  Size        : 5595
  License     : ASL 2.0
  Signature   : RSA/SHA1, Mon 15 Oct 2018 05:02:18 PM CST, Key ID f9b9fee7764429e6
  Source RPM  : openstack-nova-18.0.2-1.el7.src.rpm
  Build Date  : Tue 09 Oct 2018 05:54:47 PM CST
  Build Host  : p8le01.rdu2.centos.org
  Relocations : (not relocatable)
  Packager    : CBS <cbs@xxxxxxxxxx>
  Vendor      : CentOS
  URL         : http://openstack.org/projects/compute/
  Summary     : OpenStack Nova API services

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