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[Alexander Makarov <amakarov@xxxxxxxxxxxx>]

Public bug reported:

When configured as an Apache WSGI module a race condition is possible during keystone cache initialization:
https://github.com/openstack/keystone/blob/master/keystone/common/kvs/core.py#L240
The operation raises exception region.RegionAlreadyConfigured.
This is a result of the race condition involving global 'application' variable being initialized several times (1 per thread).
application is required to be global according to Paste Deploy documentation:
http://pythonpaste.org/deploy/
Apache modwsgi documentation suggests protecting global objects with thread locks:
http://code.google.com/p/modwsgi/wiki/ProcessesAndThreading#Building_A_Portable_Application

** Affects: keystone
     Importance: Undecided
     Assignee: Alexander Makarov (amakarov)
         Status: In Progress

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https://bugs.launchpad.net/bugs/1482271

Title:
  Race condition in multithreaded Apache/WSGI setup

Status in Keystone:
  In Progress

Bug description:
  When configured as an Apache WSGI module a race condition is possible during keystone cache initialization:
  https://github.com/openstack/keystone/blob/master/keystone/common/kvs/core.py#L240
  The operation raises exception region.RegionAlreadyConfigured.
  This is a result of the race condition involving global 'application' variable being initialized several times (1 per thread).
  application is required to be global according to Paste Deploy documentation:
  http://pythonpaste.org/deploy/
  Apache modwsgi documentation suggests protecting global objects with thread locks:
  http://code.google.com/p/modwsgi/wiki/ProcessesAndThreading#Building_A_Portable_Application

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