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[Bug 1894095] [NEW] Running periodic task during live migration results in incorrect usage

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Stephen Finucane <1894095@xxxxxxxxxxxxxxxxxx>
Date: Thu, 03 Sep 2020 11:55:16 -0000
Reply-to: Bug 1894095 <1894095@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx

Public bug reported:

With the introduction of NUMA-aware live migration in Train, we now do
proper claiming and, if necessary, unclaiming of resources at the
destination host. However, the latter uses the same mechanism as
resize/cold migrate confirm/revert, which means its subject to the same
races as those highlighted in bug 1879878. This bug tracks the live
migration side of the work to fix that.

** Affects: nova
     Importance: Medium
     Assignee: Stephen Finucane (stephenfinucane)
         Status: Confirmed

** Affects: nova/train
     Importance: Undecided
         Status: New

** Affects: nova/ussuri
     Importance: Undecided
         Status: New


** Tags: libvirt live-migration numa

** Tags added: numa

** Tags added: libvirt live-migration

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

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

** Changed in: nova
     Assignee: (unassigned) => Stephen Finucane (stephenfinucane)

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

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

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https://bugs.launchpad.net/bugs/1894095

Title:
  Running periodic task during live migration results in incorrect usage

Status in OpenStack Compute (nova):
  Confirmed
Status in OpenStack Compute (nova) train series:
  New
Status in OpenStack Compute (nova) ussuri series:
  New

Bug description:
  With the introduction of NUMA-aware live migration in Train, we now do
  proper claiming and, if necessary, unclaiming of resources at the
  destination host. However, the latter uses the same mechanism as
  resize/cold migrate confirm/revert, which means its subject to the
  same races as those highlighted in bug 1879878. This bug tracks the
  live migration side of the work to fix that.

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