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[Bug 1943191] [NEW] cold migrations being blocked by source node allocations when source node is overallocated

To: yahoo-eng-team@xxxxxxxxxxxxxxxxxxx
From: Linda Guo <1943191@xxxxxxxxxxxxxxxxxx>
Date: Fri, 10 Sep 2021 00:41:28 -0000
Reply-to: Bug 1943191 <1943191@xxxxxxxxxxxxxxxxxx>
Sender: noreply@xxxxxxxxxxxxx

Public bug reported:

openstack instance cold migrations failed with 'Unable to replace instance claim on source', it's
being blocked by source node allocations when source node is overallocated


It doesn't make sense to block the migration when source node is overallocated. It should allow the migration as long as the target node have enough capacity to hold the instance 


2021-09-09 13:52:42.142 282962 ERROR nova.conductor.tasks.migrate [req-24bc38d3-743a-466d-b303-a9f94a5aa7f6 5a9549c008c648dcb8e5eae0bcbf4adc 6261286d9e494b538a118ae2110916cb - e7a5476fc8da4ab996b3f365d3cc469b e7a5476fc8da4ab996b3f365d3cc469b] [instance: 449cde31-3d93-4dcb-87bb-26beef0a16f2] Unable to replace resource claim on source host compute-server-2 node compute-server-2 for instance

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1943191

Title:
  cold migrations being blocked by source node allocations when source
  node is overallocated

Status in OpenStack Compute (nova):
  New

Bug description:
  openstack instance cold migrations failed with 'Unable to replace instance claim on source', it's
  being blocked by source node allocations when source node is overallocated

  
  It doesn't make sense to block the migration when source node is overallocated. It should allow the migration as long as the target node have enough capacity to hold the instance 

  
  2021-09-09 13:52:42.142 282962 ERROR nova.conductor.tasks.migrate [req-24bc38d3-743a-466d-b303-a9f94a5aa7f6 5a9549c008c648dcb8e5eae0bcbf4adc 6261286d9e494b538a118ae2110916cb - e7a5476fc8da4ab996b3f365d3cc469b e7a5476fc8da4ab996b3f365d3cc469b] [instance: 449cde31-3d93-4dcb-87bb-26beef0a16f2] Unable to replace resource claim on source host compute-server-2 node compute-server-2 for instance

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