Floating IP disconnected several minutes when restarting nova-network

[stanzgy]

When restarting nova-network service, nova-network will initialize iptables and remove old rules, then add floating ip iptable forward rules one by one.
If there are a lot of floating ips on one host, the process of adding floating ip rules could last several minutes.
This will cause the floating ips which last added iptable rules disconnected for that several minutes.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/87874
Committed: https://git.openstack.org/cgit/openstack/nova/commit/?id=249f0d5157d1415cd937b300c50eb4f381ea43a7
Submitter: Jenkins
Branch: master

commit 249f0d5157d1415cd937b300c50eb4f381ea43a7
Author: stanzgy <email address hidden>
Date: Wed Apr 16 16:24:09 2014 +0800

    Defer applying iptable changes when nova-network start

    When restarting nova-network service, nova-network will initialize iptables and
    remove old rules, then add floating ip iptable forward rules one by one.

    If there are a lot of floating ips on one host, the process of adding floating
    ip rules could last several minutes, which will cause those floating ips that
    last added iptable rules disconnected for same time.

    This patch defers applying nova-network iptable rule changes until
    initialization is done instead of adding floating ip forward rules one by one.

    Change-Id: I12651850b44790aef3817fedacae050bff57e364
    Closes-bug: 1308390