Comment 1 for bug 1702270

For graceful shutdown user need to mention hook ( --hook-master-start "unix_signal:15 gracefully_kill_them_all") while starting the service.

This support is available from version 2.0.15
Reference: https://github.com/unbit/uwsgi/commit/1535b8ee139bdf9e9cca0b7ed12f1a1b8c15ffd0

Even after specifying the same workers doesn't exits gracefully. Another way is to set 'die-on-term' to False in uwsgi.ini file but after sending TERM signal it kills existing child immediately and spawns new child's (similar to reload concept) which is confusing.

Workaround:
1. Remove the KillSignal = SIGQUIT from [service] section of /<email address hidden>
2. Edit the /<email address hidden> file's [service] section
    Add below parameter [1]:
    KillMode = process

    Add the graceful shutdown hook as stated below:
    ExecStart = /usr/local/bin/uwsgi --ini /etc/glance/glance-uwsgi.ini --hook-master-start "unix_signal:15 gracefully_kill_them_all"

3. Edit the /etc/glance/glance-uwsgi.ini file of service:

    Add the below parameter [2]:
    worker-reload-mercy = <set the maximum time you think the request will take to complete>

[1] https://www.freedesktop.org/software/systemd/man/systemd.kill.html#KillMode=
[2] http://uwsgi-docs.readthedocs.io/en/latest/Options.html#worker-reload-mercy

Note:
I checked that whether is there any way to set the "worker-reload-mercy" to infinite time but there is no such way. I talked with uwsgi community on channel #uwsgi but according to <damjan> and <unixwitch> there is no way.

https://review.openstack.org/#/c/490903/ patch will solve this issue.