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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https://bugs.launchpad.net/keystone/+bug/1482271/+subscriptions
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