Comment 3 for bug 1493835

Reviewed: https://review.openstack.org/221551
Committed: https://git.openstack.org/cgit/openstack/keystoneauth/commit/?id=c8d7506ce6b555e60a94f217a41f8d397dedf651
Submitter: Jenkins
Branch: master

commit c8d7506ce6b555e60a94f217a41f8d397dedf651
Author: Jamie Lennox <email address hidden>
Date: Wed Sep 9 10:03:52 2015 +1000

    Identity plugin thread safety

    A common case is for Nova (or other service) to create an admin
    authentication from a CONF file and then have many greenlet threads that
    want to reuse that authentication. If a token expires then many threads
    all try and fetch a new token to use and can step over each other.

    I was hoping for a way to put a lock in so that all plugins were thread
    safe however fixing it for identity plugins solves almost all real world
    situations and anyone doing non-identity plugins will have to manage
    threads themselves.

    Closes-Bug: #1493835
    Change-Id: Ie478499a086a4b0db4fb9e5b820f6f5cd4074763