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[OpenStack Infra <1741125@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/531022
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=db711bc06fcc234488b107dd22dd2a0272939174
Submitter: Zuul
Branch:    master

commit db711bc06fcc234488b107dd22dd2a0272939174
Author: Ed Leafe <ed@xxxxxxxxx>
Date:   Wed Jan 3 21:38:43 2018 +0000

    Fix race condition in retrying migrations
    
    During testing in the alternate host series, it was found that retries
    when resizing an instance would always fail. This turned out to be true
    even before alternate hosts for resize was introduced. Further
    investigation showed that there was a race in call to retry the resize
    and the revert of the original attempt.
    
    This patch fixes that race condition, and updates the regression test to
    reflect the correct results.
    
    Blueprint: return-alternate-hosts
    
    Closes-Bug #1741125
    
    Change-Id: I12b4e1d9e50fefd81128df85d75bb34564f9da2c


** Changed in: nova
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1741125

Title:
  Instance resize intermittently fails when rescheduling

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  When resizing an instance, the migration task calls "replace_allocation_with_migration()', which checks to verify that the instance has allocations against the source compute node [0]. It then replaces the instance's allocation with the migration, using it's UUID as the consumer instead of the instance's. However, if the first attempt at migrating fails and the resize is rescheduled, when "replace_allocation_with_migration()" is called again, the allocations now have the migration UUID as the consumer, and so the check that the instance has allocations on the source compute node will fail, and the migration is put in an ERROR state.
   
  [0] https://github.com/openstack/nova/blob/f95f165b49fbc0efe29450b0e858a3ccadecedea/nova/conductor/tasks/migrate.py#L47-L48

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