Comment 10 for bug 1705442

Reviewed: https://review.openstack.org/488158
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=9b2a9407f7c1b4688b9f696ea94677516bca5eba
Submitter: Jenkins
Branch: master

commit 9b2a9407f7c1b4688b9f696ea94677516bca5eba
Author: Eric Harney <email address hidden>
Date: Thu Jul 27 15:17:38 2017 -0400

    Revert "Handle concurrent volume creation request"

    This change converted a lock which locked on a
    per-image basis to lock on a per-image+volume basis.

    This defeats the point of having this lock, which was
    to not perform the same image download operation more than
    once, consuming unneeded network and storage resources.

    This is not an especially strenuous or odd locking
    pattern. If this causes tooz+etcd to fail, there is
    likely a bug in tooz or etcd. There are many places in
    Cinder that use locks like this one.

    Related-Bug: #1705442

    This reverts commit 35ae6fb90380a8e9db936827a4414cb249ef399b.

    Change-Id: Ib00fcc61658f6b1e59df66d387f3101ea198d2e7