Comment 3 for bug 1163394

Reviewed: https://review.openstack.org/25918
Committed: http://github.com/openstack/nova/commit/34de8d1529fb9a2e7fad096a6967b9a483ab0cb0
Submitter: Jenkins
Branch: master

commit 34de8d1529fb9a2e7fad096a6967b9a483ab0cb0
Author: David Ripton <email address hidden>
Date: Tue Apr 2 12:19:17 2013 -0400

    Raise rather than generating millions of IPs.

    Fixes bug #1163394

    Formerly if we tried to create many millions of floating IPs with a
    range like "192.168.2.224/2", address_to_hosts would happily iterate
    over all of them (which would take a long time) and then nova-manage
    would eventually crash with an OutOfMemoryError when we tried putting
    all of them in a list. Or, if the initial list wasn't quite big
    enough to use all memory, it would blow up later (even more slowly)
    when we tried to put them in the database via SQLAlchemy.

    Now, raise exception.InvalidInput if the number of IPs is a million
    or more. (A million is erring on the side of caution.)

    Change-Id: Ifc6b6a8faadc2e97e09f9f6c975e52229f705789