Comment 38 for bug 1844446

Reviewed: https://review.opendev.org/686785
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=0c3c2623de8418ad7470d2369c26f27ef651aefc
Submitter: Zuul
Branch: stable/stein

commit 0c3c2623de8418ad7470d2369c26f27ef651aefc
Author: Alex Schultz <email address hidden>
Date: Thu Sep 26 11:05:15 2019 -0600

    Randomize the container list for uploads

    When we work through the list of containers in an alphabetical fashion,
    we end up duplicating much of the layer fetching because it can occur at
    the same time. Things like cinder-api, cinder-backup, cinder-volume
    share many of the same layers. Since we don't ensure that we only do
    a single fetching of a layer hash durring the multiprocessing, we end
    up duplicating the fetches of layers. By randomizing the fetches, we
    reduce the likelihood that we'll be fetching the same family of service
    containers concurrently.

    Change-Id: Ifbcd55de52c9e2283203b1c6e2adeb266d43eca6
    Related-Bug: #1844446
    (cherry picked from commit 3adfefa13aebd7bd9e48c952df9107d51a557011)