Comment 20 for bug 1833069

Reviewed: https://review.opendev.org/c/openstack/kolla-ansible/+/821862
Committed: https://opendev.org/openstack/kolla-ansible/commit/80a32c3c74cad4d46671faff067b274ffed74bba
Submitter: "Zuul (22348)"
Branch: master

commit 80a32c3c74cad4d46671faff067b274ffed74bba
Author: Mark Goddard <email address hidden>
Date: Wed Dec 15 16:07:50 2021 +0000

    cinder: restart services after upgrade

    This patch is roughly an adaptation of
    Ia6fc9011ee6f5461f40a1307b72709d769814a79 for cinder.

    During an upgrade, cinder pins the version of RPC calls to the minimum
    seen across all services. This ensures that old services do not receive
    data they cannot handle. After the upgrade is complete, all cinder
    services are supposed to be reloaded to cause them to check again the
    RPC versions of services and use the new latest version which should now
    be supported by all running services.

    There is a second issue in that it takes some time for the upgraded
    services to update the cinder services database table with their new
    version. We need to wait until all cinder services have done this
    before the restart is performed, otherwise the RPC version cap will
    remain in place. There is currently no interface in cinder available for
    checking these versions, so as a workaround we use a configurable
    delay with a default duration of 30 seconds, as we do for nova.

    This change restarts all cinder services after an upgrade, after a 30
    second delay.

    Closes-Bug: #1954932
    Related-Bug: #1833069

    Change-Id: I9164dc589386d2c2d4daf1bf84061b806ba9988d