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[Matt Riedemann <mriedem.os@xxxxxxxxx>]

*** This bug is a duplicate of bug 1632247 ***
    https://bugs.launchpad.net/bugs/1632247

Looks like this was fixed in Ocata:

https://review.openstack.org/#/c/409943/

** This bug has been marked a duplicate of bug 1632247
   nova list --all-tenants fetches all instance faults but uses only latest

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https://bugs.launchpad.net/bugs/1495400

Title:
  list instance details caused host CPU overload if each one instance
  had lots of instance faults

Status in OpenStack Compute (nova):
  Confirmed

Bug description:
  1. code base

  $ git log -1
  commit e70ff282f8ed92133942f4d878c2b5f8564f83a8
  Merge: 9e0e7a3 222085d
  Author: Jenkins <jenkins@xxxxxxxxxxxxxxxxxxxx>
  Date:   Mon Sep 14 05:44:39 2015 +0000

      Merge "Invalidate AZ cache when the instance AZ information is
  different"

  2. Reproduce steps:

  * background data: 1000 instances, 10000 faults record in each instance
  * list all instance details

  Expected result:
  * nova-api Host CPU load in a reasonable range, like: 85%

  Actual result:
  * nova-api Host CPU load persist 100%

  NOTE: we collect all faults of each instance in db api (all results
  loop), and only return the latest one in InstanceList object(all
  results loop), I think we should return the latest fault of each
  instance in db api, that can avoid an all results loop in InstanceList
  object.

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