Comment 12 for bug 1423250

Reviewed: https://review.openstack.org/157320
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=f9b2791735863b58171ee8be46c47ef3ed2c5edd
Submitter: Jenkins
Branch: master

commit f9b2791735863b58171ee8be46c47ef3ed2c5edd
Author: Elena Ezhova <email address hidden>
Date: Thu Feb 19 13:34:17 2015 +0300

    Prevent calling waitall() inside a GreenPool's greenthread

    When neutron-server is running with several api workers
    sending it a termination signal (SIGTERM, SIGHUP or SIGINT)
    leads to waitall() being called inside a GreenPool's greenthread.

    The reason is that a wsgi server is started in a green thread
    from the same green pool that is passed to the server itself
    to be used for spawning client green threads.

    To avoid it, it is reasonable to use different pools for spawning
    a wsgi server and for its internal usage.

    This is also the case for metadata agent running with several
    metadata workers.

    Change-Id: I38174396f06fcb29ac0776534ac6494dabb00df6
    Closes-Bug: #1423250