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[Andrew Laski <andrew.laski@xxxxxxxxxxxxx>]

Public bug reported:

During testing we found that if 220,000 instances match the updated_at
criteria in _heal_instances they are all pulled from the db which can
lead to huge memory usage and the oom killer stepping in.  The large
number of updated_at instances could happen organically, but in our case
was triggered by the _run_pending_deletes compute periodic task updating
a large number of instances.

** Affects: nova
     Importance: Undecided
     Assignee: Andrew Laski (alaski)
         Status: In Progress

** Changed in: nova
     Assignee: (unassigned) => Andrew Laski (alaski)

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https://bugs.launchpad.net/bugs/1447732

Title:
  Cells: _heal_instances periodic task can lead to too much memory usage

Status in OpenStack Compute (Nova):
  In Progress

Bug description:
  During testing we found that if 220,000 instances match the updated_at
  criteria in _heal_instances they are all pulled from the db which can
  lead to huge memory usage and the oom killer stepping in.  The large
  number of updated_at instances could happen organically, but in our
  case was triggered by the _run_pending_deletes compute periodic task
  updating a large number of instances.

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