Comment 2 for bug 1526876

Reviewed: https://review.openstack.org/260278
Committed: https://git.openstack.org/cgit/openstack/murano/commit/?id=cc3739d021c5393a12f41e95655c982c4500efe6
Submitter: Jenkins
Branch: master

commit cc3739d021c5393a12f41e95655c982c4500efe6
Author: Stan Lagun <email address hidden>
Date: Tue Dec 22 03:15:19 2015 +0300

    Wait for state progress of Heat stack upon delete

    When Murano deletes Heat stack it waits for stack to
    disappear handling intermediate DELETE_IN_PROGRESS
    status. However if Heat doesn't immediately starts stack
    deletion the first status observed might be UPDATE_COMPLETE
    or CREATE_COMPLETE. This unexpected stack will cause exception
    to be thrown and internal variable holding stack content no to
    be reset. As a result subsequent stack.push() calls can recreate the
    stack.

    The solution is to wait for stack progress before waiting for
    terminal state. This ability was added earlier and used for stack updates
    but not for delete(). However delete() brings another corner case that
    need to be handled - attempt to delete stack that is not exist. In this
    case there is not going to be any status progress so Murano must not
    wait for it (because otherwise it will wait forever). This case needs special
    handling.

    Change-Id: I6f4782879b85ac5691d3c3a7203e8fa60fdbbeaf
    Closes-Bug: #1526876