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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message%3A%5C%22Exception%20during%20message%20handling%3A%20TypeError%3A%20object%20of%20type%20'object'%20has%20no%20len()%5C%22%20AND%20tags%3A%5C%22screen-n-sch.txt%5C%22&from=7d

** Also affects: nova/train
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1857139

Title:
  TypeError: object of type 'object' has no len() from
  resources_from_request_spec when cells are down

Status in OpenStack Compute (nova):
  Triaged
Status in OpenStack Compute (nova) train series:
  New

Bug description:
  Seen here:

  https://zuul.opendev.org/t/openstack/build/c187e207bc1c48a0a7fa49ef9798b696/log/logs/screen-n-sch.txt.gz#2529

  cell1 is down so the call to scatter_gather_cells in
  get_compute_nodes_by_host_or_node yields a result but it's not a
  ComputeNodeList, it's the did_not_respond_sentinel object:

  https://github.com/openstack/nova/blob/02019d2660dfce3facdd64ecdb2bd60ba4a91c6d/nova/scheduler/host_manager.py#L705

  https://github.com/openstack/nova/blob/02019d2660dfce3facdd64ecdb2bd60ba4a91c6d/nova/context.py#L454

  which results in an error here:

  https://github.com/openstack/nova/blob/02019d2660dfce3facdd64ecdb2bd60ba4a91c6d/nova/scheduler/utils.py#L612

  The HostManager.get_compute_nodes_by_host_or_node method should filter
  out fail/timeout results from the scatter_gather_cells results. We'll
  get a NoValidHost either way but this is better than the traceback
  with the TypeError in it.

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