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[Yingxin <yingxin.cheng@xxxxxxxxx>]

Public bug reported:

The way scheduler consumes disk resources in host state is inconsistent
with RT's way in compute service.

The scheduler consumes "free_disk_mb" in its host state.
https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L266

It comes from the min value of "free_disk_gb" and "disk_available_least" in ComputeNode object.
https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L189-L201

But compute node changes "local_gb_used" instead in consuming resources
from a request.
https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L709-L710


There is a inconsistent gap(confirmed) of compute node state between
scheduler and resource tracker, but somehow the compute node will be
updated by virt driver to the consistent status after maybe 10 seconds.

** Affects: nova
     Importance: Undecided
     Assignee: Yingxin (cyx1231st)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => Yingxin (cyx1231st)

** Changed in: nova
       Status: New => In Progress

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https://bugs.launchpad.net/bugs/1550098

Title:
  Disk resource consumption is inconsistent between scheduler and
  resource tracker

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  The way scheduler consumes disk resources in host state is
  inconsistent with RT's way in compute service.

  The scheduler consumes "free_disk_mb" in its host state.
  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L266

  It comes from the min value of "free_disk_gb" and "disk_available_least" in ComputeNode object.
  https://github.com/openstack/nova/blob/master/nova/scheduler/host_manager.py#L189-L201

  But compute node changes "local_gb_used" instead in consuming
  resources from a request.
  https://github.com/openstack/nova/blob/master/nova/compute/resource_tracker.py#L709-L710


  There is a inconsistent gap(confirmed) of compute node state between
  scheduler and resource tracker, but somehow the compute node will be
  updated by virt driver to the consistent status after maybe 10
  seconds.

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