Comment 7 for bug 1475057

Reviewed: https://review.openstack.org/206506
Committed: https://git.openstack.org/cgit/openstack/heat/commit/?id=b76f6ec0e97a9c3aaf5b5140e7a449c9636b8f95
Submitter: Jenkins
Branch: master

commit b76f6ec0e97a9c3aaf5b5140e7a449c9636b8f95
Author: ricolin <email address hidden>
Date: Sat Aug 1 00:52:57 2015 +0800

    resource failure causes nested stacks to be rolled back

    an update_cancel RPC call for a nested stacks whenever an update
    operation was cancelled in the parent stack.Unfortunately this always
    triggers a rollback.
    In this change, resource failure with nested stacks will cancel any
    in-progress update but not roll back by default (roll back only when
    rollblack cancel exception raised).
    The Operator can retry in this way without waiting for timeout
    or overall roll back occurred.
    Change-Id: I94d75a21367f39c17a9b40b5d23405a28873cd1a
    Closes-Bug: #1475057