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[xhzhf <guoyongxhzhf@xxxxxxx>]

Public bug reported:

Description
===========
when getting in instance's detail info, AZ info is wrong

Steps to reproduce
==================
1.
in nova.conf, set memcached_servers = None

2.current az info:
nova aggregate-list
Id name     Availability Zone
1 cas1-agg  cas1
modifiy az info:
nova aggregate-update 1 cas1-agg cas2

3.get instance az info:
nova show ID

 
Expected result
===============
AZ info is cas2

Actual result
=============
AZ info is not stable.sometimes AZ is cas1, sometimes is cas2

Reason
===============
nova-api is multi-processing. When setting memcache server to none, nova-api will cache az in process memory. But nova-api processes caches are not consistent.
So I suggest nova-api does not cache az info in process memory.
Related file is nova/openstack/common/memorycached.py
Related class is Client.

** Affects: nova
     Importance: Undecided
     Assignee: xhzhf (guoyongxhzhf)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => xhzhf (guoyongxhzhf)

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https://bugs.launchpad.net/bugs/1633323

Title:
  [available-zone]az cachee in process make mistake

Status in OpenStack Compute (nova):
  New

Bug description:
  Description
  ===========
  when getting in instance's detail info, AZ info is wrong

  Steps to reproduce
  ==================
  1.
  in nova.conf, set memcached_servers = None

  2.current az info:
  nova aggregate-list
  Id name     Availability Zone
  1 cas1-agg  cas1
  modifiy az info:
  nova aggregate-update 1 cas1-agg cas2

  3.get instance az info:
  nova show ID

   
  Expected result
  ===============
  AZ info is cas2

  Actual result
  =============
  AZ info is not stable.sometimes AZ is cas1, sometimes is cas2

  Reason
  ===============
  nova-api is multi-processing. When setting memcache server to none, nova-api will cache az in process memory. But nova-api processes caches are not consistent.
  So I suggest nova-api does not cache az info in process memory.
  Related file is nova/openstack/common/memorycached.py
  Related class is Client.

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