Comment 39 for bug 1357055

Reviewed: https://review.openstack.org/171848
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=1642bca4d9c4fee15129f74d93300c1eab1afd29
Submitter: Jenkins
Branch: master

commit 1642bca4d9c4fee15129f74d93300c1eab1afd29
Author: Eugene Nikanorov <email address hidden>
Date: Thu Apr 9 01:16:18 2015 +0300

    Handle race condition on subnet-delete

    This fix targets quite rare case of race condition between
    port creation and subnet deletion. This usually happens
    during API tests that do things quickly.
    DHCP port is being created after delete_subnet checks for
    DHCP ports, but before it checks for IPAllocations on subnet.
    The solution is to apply retrying logic, which is really necessary
    as we can't fetch new IPAllocations with the same query and within
    the active transaction in mysql because of REPEATABLE READ
    transaction isolation.

    Change-Id: Ib9da018e654cdee3b64aa38de90f171c92ee28ee
    Closes-Bug: 1357055