Comment 3 for bug 1334651

Reviewed: https://review.openstack.org/104887
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=2f3d774eb51eac9a370813362047a2cb3d124d86
Submitter: Jenkins
Branch: master

commit 2f3d774eb51eac9a370813362047a2cb3d124d86
Author: Rajesh Tailor <email address hidden>
Date: Thu Jul 3 07:44:20 2014 -0700

    Nova-api service throws error when SIGHUP is sent

    Added reset method in WSGIService class.

    After adding reset method when SIGHUP signal is sent to
    wsgi service parent process,then it sends SIGHUP signal
    to all of its child processes. Each child process handles
    SIGHUP signal by first stopping the service and then calls
    service start method again. When it stops the service, it
    kills the eventlet thread, which internally closes the wsgi
    server socket object. This server socket object is now not
    usable again and it throws following error, while restarting
    the service:

    error: [Errno 9] Bad file descriptor

    To resolve 'Bad file descriptor' error, creating duplicate
    socket object, every time service starts.

    When the wsgi service is stopped, it sets the green pool
    size to 0, so resizing the green pool to default value,
    on service restart.

    Closes-Bug: #1334651

    Change-Id: If1035deaf8b31f2712d88f0112fdd2e9e9dc7cb0