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[Launchpad Bug Tracker <1668295@xxxxxxxxxxxxxxxxxx>]

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In an environment with multiple nova-computes running Ironic driver with
hashring, when one of the compute nodes is down all instances bound to
this nova-compute are not manageable (start, stop, get-serial-console).
This is because OS-EXT-SRV-ATTR:host is pointing to dead nova-compute.

We should take advantage of hashring which we have here and update OS-
EXT-SRV-ATTR:host as well during nodes reassignment.

** Affects: nova
     Importance: Undecided
         Status: New

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Ironic hash ring in Ironic nova-compute driver does not  update hypervisor host
https://bugs.launchpad.net/bugs/1668295
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