Comment 21 for bug 1341420

Reviewed: https://review.openstack.org/226235
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=608af87541240793425760c16e528d9b3ec02fee
Submitter: Jenkins
Branch: master

commit 608af87541240793425760c16e528d9b3ec02fee
Author: Lucas Alvares Gomes <email address hidden>
Date: Mon Sep 21 16:36:04 2015 +0100

    Ironic: Workaround to mitigate bug #1341420

    The bug #1341420 can cause the driver to try to deploy onto a node which
    already has an instance associated with it, the way Ironic reserve a
    node to a specific instance is associating the UUID of that instance
    with the node via the instance_uuid field. This patch just makes the
    request to associate that field non-retriable when the api returns HTTP
    409 (Conflict) (that's the HTTP error indicating that the node is
    already associated with another instance), so it can fail fast in
    case the node is already pick and the RetryFilter could then pick
    another node for that instance.

    Partial-Bug: #1341420
    Change-Id: I697c5129893b18562182bbb3ceb8cb160e84c312