Comment 5 for bug 1229042

Reviewed: https://review.openstack.org/50258
Committed: http://github.com/openstack/glance/commit/9a557c8f54e8ac0db2f48bb95296ea2a9ef9a7bb
Submitter: Jenkins
Branch: stable/grizzly

commit 9a557c8f54e8ac0db2f48bb95296ea2a9ef9a7bb
Author: Attila Fazekas <email address hidden>
Date: Mon Sep 23 08:44:37 2013 +0200

    Fixing glance-api hangs in the qpid notifier

    Glance-api was able to hang in qpid notifier under heavy image creation load.

    The ``thread`` and ``select`` modules used by the python-qpid for managing
    the AMQP connection. When the eventlet was not able to switch between threads
    because leaded to hang and/or pipe(2) leaking issues.

    * Monkey patching the ``select`` and ``thread`` modules to be eventlet friendly
      in order to avoid hanging issues.

    * The reference to the connection object in the QpidStrategy
      was replaceable by a concurrent thread, which could cause various issues.
      Using just local variables for storing connection object in order to avoid
      concurrent unsafe manipulation.

    Fixing bug 1229042

    Change-Id: I8fa8c4f36892b96d406216cb3c64854a94ca9df7
    (cherry picked from commit 2e7aa761b6c2b31f4cbd9703ee19090b6757508a)