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[Ed Leafe <ed@xxxxxxxxx>]

Public bug reported:

The recently merged patch (https://review.openstack.org/484949) runs the
migration in the driver's init_host() method. It has since been pointed
out that if there are multiple computes handling ironic, some instances
can get skipped if the hash ring is refreshed and an unmigrated instance
is placed on a compute whose init_host has already run. While a rare
thing, this should be corrected to ensure that all instances have their
flavors migrated in Pike.

** Affects: nova
     Importance: Medium
     Assignee: Ed Leafe (ed-leafe)
         Status: In Progress


** Tags: ironic note-to-self

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https://bugs.launchpad.net/bugs/1707021

Title:
  Ironic Flavor Migration can miss instances

Status in OpenStack Compute (nova):
  In Progress

Bug description:
  The recently merged patch (https://review.openstack.org/484949) runs
  the migration in the driver's init_host() method. It has since been
  pointed out that if there are multiple computes handling ironic, some
  instances can get skipped if the hash ring is refreshed and an
  unmigrated instance is placed on a compute whose init_host has already
  run. While a rare thing, this should be corrected to ensure that all
  instances have their flavors migrated in Pike.

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