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[Bug 1886160] Re: Anti-affinity instance creation failed and the scheduling node was incorrect.

 

[Expired for OpenStack Compute (nova) because there has been no activity
for 60 days.]

** Changed in: nova
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1886160

Title:
  Anti-affinity instance  creation failed  and the scheduling node was
  incorrect.

Status in OpenStack Compute (nova):
  Expired

Bug description:
  Description
  ===========
  Anti-affinity instance  creation failed.My environment has five compute node, I created a server group, create instances, five the affinity of the fifth instance failure, log prompt "Exceeded Max scheduling attempts for 3 instan". In the first four instances on the calculation of 1-4, the fifth instance is created to compute1, compute2, compute3 try to create, due to the affinity strategy cannot create, prompted to create failure after trying three times, (the scheduler Max_attempts default 3),(max_server_per_host default 1).

  compute1, compute2, compute3  all have error log, and compute4
  ,compute5  have no error log.

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

  1.One control node, five compute nodes
  2.Nova version:Queen

  Error Logs
  ==========
  'message': 'Exceeded maximum number of retries. Exceeded max scheduling attempts 3 for instan: Build of instance 019e9891-72c9-4a15-a8f4-3b6ccc3c4535 was re-scheduled: Anti-affinity instance group policy was viol', 'code': 500, "/var/lib/openstack/lib/python2.7/site-packages/nova/conductor/manager.py", line 610, in build_instances\n    filter_properties, inst7/site-packages/nova/scheduler/utils.py", line 680, in populate_retry\n    raise exception.MaxRetriesExceeded(reason=msg)\nMaxRetriesEax scheduling attempts 3 for instance 019e9891-72c9-4a15-a8f4-3b6ccc3c4535. Last exception: Build of instance 019e9891-72c9-4a15-a8f4-roup policy was violated.\n', 'created': '2020-07-02T06:21:20Z'}

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References