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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

Public bug reported:

This code in the scheduler report client is used by the scheduler when
making allocation requests against a certain instance during a move
operation:

https://github.com/openstack/nova/blob/09f0795fe0f5d043593f5ae55a6ec5f6298ba5ba/nova/scheduler/client/report.py#L200

The idea is to retain the source node allocations in Placement when also
adding allocations for the destination node.

However, with the set difference code in there, it does not account for
resizing an instance to the same host, where the compute node for the
source and destination are the same.

We need to double the allocations for resize to same host for a case
like resizing the instance and the VCPU/MEMORY_MB goes down but the
DISK_GB goes up.

** Affects: nova
     Importance: Medium
         Status: Confirmed


** Tags: pike-rc-potential placement scheduler

** Tags added: pike-rc-potential

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https://bugs.launchpad.net/bugs/1707252

Title:
  Claims in the scheduler does not account for doubling allocations on
  resize to same host

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  This code in the scheduler report client is used by the scheduler when
  making allocation requests against a certain instance during a move
  operation:

  https://github.com/openstack/nova/blob/09f0795fe0f5d043593f5ae55a6ec5f6298ba5ba/nova/scheduler/client/report.py#L200

  The idea is to retain the source node allocations in Placement when
  also adding allocations for the destination node.

  However, with the set difference code in there, it does not account
  for resizing an instance to the same host, where the compute node for
  the source and destination are the same.

  We need to double the allocations for resize to same host for a case
  like resizing the instance and the VCPU/MEMORY_MB goes down but the
  DISK_GB goes up.

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