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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

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

** Changed in: nova/ocata
       Status: New => In Progress

** Changed in: nova/ocata
   Importance: Undecided => Low

** Changed in: nova/ocata
     Assignee: (unassigned) => Matt Riedemann (mriedem)

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https://bugs.launchpad.net/bugs/1784874

Title:
  ResourceTracker doesn't clean up compute_nodes or stats entries

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) ocata series:
  In Progress
Status in OpenStack Compute (nova) pike series:
  In Progress
Status in OpenStack Compute (nova) queens series:
  In Progress

Bug description:
  This was noted in review:

  https://review.openstack.org/#/c/587636/4/nova/compute/resource_tracker.py@141

  That the ResourceTracker.compute_nodes and ResourceTracker.stats (and
  old_resources) entries only grow and are never cleaned up as we
  rebalance nodes or nodes are deleted, which means it just takes up
  memory over time.

  When we cleanup compute nodes here:

  https://github.com/openstack/nova/blob/47ef500f4492c731ebfa33a12822ef6b5db4e7e2/nova/compute/manager.py#L7759

  We should probably call a cleanup hook into the ResourceTracker to
  cleanup those entries as well.

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