Instance in anti-affinity group migrate from host1 to host2 success, then migrate back failed

[jiangyuhao]

Description
===========
Create an instance in anti-affinity group, then migrate this instance from one host to another success, but migrate back failed.

Steps to reproduce
==================
1. create anti-affinity group
+--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+
| Id | Name | Project Id | User Id | Policies | Members | Metadata |
+--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+
| 2f9cb321-c62a-4d1c-a8b0-b23748801db5 | anti-affinity | 1f150042e3c34005a25332f7bcf575c3 | 280cf20a856a4da699a56f91777568bc | [u'anti-affinity'] | [] | {} |
+--------------------------------------+---------------+----------------------------------+----------------------------------+--------------------+---------+----------+

2. create an instance in this group
nova boot --flavor 1 --image 480fc701-06b2-451e-baf2-2dec4a0799e6 --nic net-id=4ff1fbc3-b69d-44c6-bedd-16c3c55eadc2 --hint group=2f9cb321-c62a-4d1c-a8b0-b23748801db5 test-anti

3. migrate this instance success
nova migrate 974b3da6-25ca-4169-b708-329c9ab0457e

4. migrate again failed
nova migrate 974b3da6-25ca-4169-b708-329c9ab0457e
ERROR (BadRequest): No valid host was found. No valid host found for cold migrate (HTTP 400) (Request-ID: req-3fc9fa7a-cdcf-4a25-b249-6f8388f20bbc)

5. only have two compute_nodes.
nova hypervisor-list
+--------------------------------------+---------------------+-------+---------+
| ID | Hypervisor hostname | State | Status |
+--------------------------------------+---------------------+-------+---------+
| 4134c729-e9e5-441c-a72d-42efa8a39001 | host-10-43-203-85 | up | enabled |
| cade3580-8221-4cd1-bcb3-23c62142c469 | host-10-43-202-88 | up | enabled |
+--------------------------------------+---------------------+-------+---------+

Expected result
===============
migrate success because this anti-affinity group without other instance.

Actual result
=============
migrate failed in second times.

Environment
===========
1. Exact version of OpenStack you are running. See the following
  Pike

2. Which hypervisor did you use?
   Libvirt + KVM

3. Which networking type did you use?
   Neutron with OpenVSwitch

Logs & Configs
==============
1. nova-scheduler
2019-01-14 19:23:23.555 18615 INFO nova.filters [req-3fc9fa7a-cdcf-4a25-b249-6f8388f20bbc 280cf20a856a4da699a56f91777568bc 1f150042e3c34005a25332f7bcf575c3 - default default] Filtering removed all hosts for the request with instance ID '974b3da6-25ca-4169-b708-329c9ab0457e'. Filter results: ['RetryFilter: (start: 1, end: 1)', 'AvailabilityZoneFilter: (start: 1, end: 1)', 'ComputeFilter: (start: 1, end: 1)', 'ComputeCapabilitiesFilter: (start: 1, end: 1)', 'ImagePropertiesFilter: (start: 1, end: 1)', 'PciPassthroughFilter: (start: 1, end: 1)', 'AggregateCoreFilter: (start: 1, end: 1)', 'AggregateRamFilter: (start: 1, end: 1)', 'AggregateMultiTenancyIsolation: (start: 1, end: 1)', 'NetworkFilter: (start: 1, end: 1)', 'HostOccupiedFilter: (start: 1, end: 1)', 'RamFilter: (start: 1, end: 1)', 'CoreFilter: (start: 1, end: 1)', 'ServerGroupAntiAffinityFilter: (start: 1, end: 0)']

2. request_spec's value changed when first migrate success
update source compute_node in request-spec's server_group_hosts when first migrate success.

[Brin Zhang (zhangbailin)]

This is live migrate? or cold migrate?

[Artom Lifshitz (notartom)]

Looks like this could be a duplicate of bug 1669054. The fix for pike was merged in April 2019, *after* this bug was filed in January 2019. Could you update to latest pike and let us know if that fixes the issue?

[Balazs Gibizer (balazs-gibizer)]

Marking the bug incomplete as there are question for the reporter. Please set it back to New when such question is answered.