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It\u0027s unclear\nhow this could happen besides some weird clustered rabbitmq\nissue where maybe the schedule and build request to conductor\nhappens twice for the same instance and one picks a host and\ntries to build and the other fails during scheduling and is\nburied in cell0.\n\nTo avoid a split brain situation like this, we add a sanity\ncheck in _bury_in_cell0 to make sure the instance mapping is\nnot pointing at a cell when we go to update it to cell0.\nSimilarly a check is added in the schedule_and_build_instances\nflow (the code is moved to a private method to make it easier\nto test).\n\nWorst case is this is unnecessary but doesn\u0027t hurt anything,\nbest case is this helps avoid split brain clustered rabbit\nissues.\n\nCloses-Bug: #1775934\n\nChange-Id: I335113f0ec59516cb337d34b6fc9078ea202130f\n(cherry picked from commit 5b552518e1abdc63fb33c633661e30e4b2fe775e)\n(cherry picked from commit efc35b1c5293c7c6c85f8cf9fd9d8cd8de71d1d5)\n(cherry picked from commit c895d3e6bca562225d70e8f81255f38970f7fcda)\n","web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/9b507c21aeeab876cd6a222d68f981fc923e8504"}],"resolve_conflicts_web_links":[{"name":"gitea","tooltip":"Open in GitWeb","url":"https://opendev.org/openstack/nova/commit/9b507c21aeeab876cd6a222d68f981fc923e8504"}]},"branch":"refs/heads/stable/rocky"}},"requirements":[],"submit_records":[],"submit_requirements":[]}